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Savannah River Site Plutonium 

Construction Trade Worker Stratification 

Refinement

White Paper

National Institute for Occupational 

Safety and Health

May 28, 2019

Matthew Arno and Christopher Tornes 

Oak Ridge Associated Universities Team

Reviewed by Timothy Taulbee and Mark Rolfes 

Division of Compensation Analysis and Support

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 2 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

INTRODUCTION

In August 2017, a joint meeting of the Advisory Board on Radiation and Worker Health

Savannah River Site (SRS) and Special Exposure Cohort (SEC) Issues Work Groups was 

convened to review and discuss the SRS internal dose coworker study, Internal Coworker 

Dosimetry Data for the Savannah River Site, ORAUT-OTIB-0081, Rev. 03 (ORAUT 2016). 

During this meeting an observation was made that: 

[ORAUT 2016] appears to contradict itself on whether prime CTWs represent a 

similar monitoring protocol as subcontractor CTWs. Prime construction workers 

are described as being exposed “temporarily but frequently for short periods” but 

also on an annual bioassay schedule specified by the bioassay control procedures. 

Subcontractor workers were monitored on a case-by-case basis depending on the 

localized requirements of the job. 

The National Institute of Occupational Safety and Health (NIOSH) Division of Compensation 

Analysis and Support (DCAS) responded that: 

The proper question is not whether the monitoring protocols were the same but 

whether the exposure conditions were similar. If prime CTWs had similar exposure 

conditions to subcontractor CTWs, then bioassay data from prime CTWs, and thus 

intakes based on that data, may be used to assign intakes to unmonitored 

subcontractor CTWs. It is NIOSH’s position that the exposure conditions and 

potential for intakes were similar among all CTWs. 

Additional job plan examples and discussions in defense of this position were documented in 

Internal Coworker Dosimetry Data for the Savannah River Site, ORAUT-OTIB-0081, Rev. 04 

(ORAUT 2019). Subsequent working group discussions raised the issue regarding whether there 

is a difference in bioassay results between prime and subcontractor Construction Trade Workers 

(CTWs). 

NIOSH has taken the position that all CTWs should be combined into a single stratum for the 

assignment of intakes and doses in the internal dose coworker study, as there is no systemic 

difference in exposure potential between prime and subcontractor CTWs. On December 14, 

2017 (initial tasking) and July 18, 2018 (expanded scope), DCAS requested Oak Ridge 

Associated Universities Team (ORAUT) support to develop intake models for prime (E. I. du 

Pont de Nemours and Company [DuPont]) CTWs and subcontractor CTWs using the uncensored 

plutonium bioassay data from 1974, 1977, 1980, 1983, and 1986. The intent of this effort was to 

stratify the CTW worker population contained in the coworker study (NIOSH-DCAS Claims 

Tracking System [NOCTS] data) by prime and subcontractor CTWs. This exercise involved 

plutonium urine bioassay data only. This white paper presents the results of a review of 

representative years of CTW bioassay data and the resultant calculated intakes. 
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 3 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

SOURCE DATA

The source data for this exercise were obtained from NOCTS files and SRS Bioassay Logbooks. 

The initial dataset was drawn from the NOCTS source files referenced in ORAUT-OTIB-0081,

Rev. 04 (ORAUT 2019). The original plutonium coworker dataset contained bioassay data from 

both CTWs and non-CTWs (Operations). This white paper focuses only on the CTW population 

from ORAUT-OTIB-0081, Rev. 04 for the 5 years selected for analysis. This original CTW 

dataset was stratified into prime versus subcontractor workers using SRS payroll identification

(PRID) numbers. The PRID format protocol for subcontract CTWs is as follows: 

• n-xxxxx where the prefix “n” is either 4, 5, 6, or a two digit number such as 17. The 

number to the right of the dash must be 5 digits. Examples are 4-23456, 6-12345, 17-

54321

• xxxxx where xxxxx is a 5-digit number with no dashes. An example is 23456. An 

example of a PRID to skip is 2-3456

Each result with a PRID meeting the above criteria was considered a subcontractor CTW. All 

other results were considered prime CTW related results.

This original NOCTS-sourced coworker dataset provided an acceptable quantity of information 

to perform an analysis, however the data was highly censored for most years, particularly for the 

subcontractor CTW population. To increase the number of uncensored results and provide a 

more reasonable assessment, a second data source was created consisting of additional coding of 

SRS provided logbooks (DuPont 1971–1979, 1973–1974, 1973–1979, 1974–1979, 1974, 1975, 

1975–1976, 1977–1978, 1978–1979, 1979–1980a, 1979–1980b, 1980a, 1980b, 1980c, 1981a, 

1981b, 1980–1981a, 1980–1981b, 1980–1989, 1981–1986, 1983, 1983–1984, 1983–1985, 1984–

1986, 1985–1986, 1986, 1986–1987a, 1986–1987b, 1986–1988, 1986–1989, 1986–1990). The 

logbook dataset served a dual purpose of increasing the number of uncensored results from the 

NOCTS-sourced data and increasing the number of subcontractor CTWs available for analysis in 

1974, 1983, and 1986. Original NOCTS-sourced data for 1977 and 1980 contained a sufficient 

amount of uncensored prime and subcontractor CTWs for this analysis; therefore, additional 

coding of subcontractor CTWs was not performed for these years. 

The reporting format found in the logbooks was not always consistent about the type of 

information recorded by laboratory staff. Most of the data contained either a censored (<) or

uncensored result (reported as dpm/1.5L). In some instances, dpm/disc values were reported 

along with the corresponding conversion to dpm/1.5L; at other times, only the dpm/disc data 

were recorded by laboratory staff. When the raw dpm/disc values were noted in the logbooks, 

they were coded for all years and regression analysis was performed to estimate actual 

uncensored results, in lieu of actual SRS laboratory calculations that were unavailable. Tables 1 

and 2 summarize the total number of prime CTW and subcontractor CTW workers, respectively,

and the number of those workers with uncensored time-weighted one person-one statistic

(TWOPOS) results for use in the statistical analysis.
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

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This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

STATISTICAL ANALYSIS

Data Analysis

The bioassay data assembled from the data sources listed above were analyzed and adjustments 

were made to allow statistical analysis. The measures taken were: 

• Illegible date corrections

• Exclude records with an illegible year. 

• If only the day of the month is illegible, assume the 15th. 

• If only the month is illegible, assume July. 

• If the month and day are illegible, assume July 1st. 

• Incident/Exclusions:

• [Redacted], Claim ID [Redacted], exclude all results after [Redacted], significant 

body content and residual excretion. 

• Infer a <0.1 result on [Redacted] for [Redacted], Claim ID [Redacted]. 

• Infer a <0.1 result on [Redacted] for [Redacted], PRID [Redacted]. 

• [Redacted], PRID [Redacted], was chelated on [Redacted] 

• Use the following data source hierarchy: 

• If the NOCTS-sourced reported result is uncensored and nonzero, use that value, 

else...

• If the Site Research Database (SRDB)-sourced reported result is uncensored and 

nonzero, use that value, else...

• Use dpm/1.5L values if present. 

i. Replace any zero (or blank) dpm/1.5L values with the corresponding 

corrected dpm/disc value. To determine the correction, regress dpm/1.5L 

values on corresponding dpm/disc values and use the regression coefficients 

to calculate blank or zero dpm/1.5L values from their corresponding dpm/disc 

results. 

ii. Average all the dpm/1.5L values for the sample. 

• If no uncensored data are present, use the censored reported value. 

• If none of these values are present or if the only value present is lost in process (LIP), 

do not use the row. 

• For data reported as 239Pu values, correct to plutonium gross alpha by multiplying by 1.69 

(10-year 12% plutonium mix ratio). If the result is reported per liter, adjust to per day 

(1.5L/d).

• Do not use 238Pu results. 

A portion of the data contained in the logbooks noted only the raw dpm/disc value and did not 

report a dpm/1.5L value. The specific formula used to convert results from dpm/disc to 

dpm/1.5L was not readily available for each period of interest; therefore, a regression analysis 

technique was employed to calculate a dpm/1.5L value for use in the modeling. The regression 
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 5 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

was performed on an annual basis. All logbook samples with both a dpm/disc and a 

corresponding dpm/1.5L conversion were plotted and the relationship from the fitted regression 

was used to develop annual coefficients. The regression coefficients were then used to calculate 

dpm/1.5L values for samples with only a reported dpm/disc value, per the instructions. The 

regression coefficients discussed above are presented in Attachment A. 

Statistical Analysis

Statistical analysis of the plutonium bioassay data was performed in accordance with Analysis of 

Stratified Coworker Datasets, ORAUT-RPRT-0053, Rev. 02 (ORAUT 2014) using the 

TWOPOS method from that document. Summary statistics for the DuPont CTW and 

subcontractor CTW strata for 1974, 1977, 1980, 1983, and 1986 using regression on order 

statistic (ROS) fits were prepared and are listed in Tables 1 and 2, respectively. Additionally, 

box plots of the TWOPOS data were prepared. The summary statistics plots and box plots are 

provided in Attachments B and C, respectively.

Table 1. Summary statistics for prime CTWs

Year Number of 

TWOPOS Results

Number of 

Uncensored 

TWOPOS Results

GM (dpm/1.5L) GSD

1974 98 38 0.004689 7.26

1977 114 35 0.003447 4.866

1980 72 32 0.005597 6.129

1983 65 23 0.007492 5.341

1986 45 20 0.01141 3.522

Table 2. Summary statistics for subcontractor CTWs

Year Number of 

TWOPOS Results

Number of 

Uncensored 

TWOPOS Results

GM (dpm/1.5L) GSD

1974 216 42 0.001439 7.45

1977 69 20 0.001745 6.838

1980 83 40 0.009319 5.736

1983 641 226 0.005914 5.364

1986 1130 472 0.00917 4.79

INTAKE MODELING

The results of the plutonium urinary excretion statistical analysis were used to calculate intakes 

that would result in the corresponding urinary excretions. For each year analyzed, it was 

assumed to be representative of the 3-year period centered on each year. Thus, the statistical 

analysis for 1974 is representative of the entire period from January 1, 1973, through December 

31, 1975. By this method, contiguous intake periods from January 1, 1973, through December 

31, 1987, were developed. 
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 6 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Each result that was used in the intake calculations was assumed to have a normal distribution. 

A uniform absolute error of 1 was applied to all results, thereby assigning the same weight to 

each result. The Integrated Modules for Bioassay Analysis (IMBA) program requires in vitro 

bioassay results to be in units of activity per day; therefore, all urinalysis results were normalized 

as needed to 24-hr samples using 1,500 mL (the volume of urine assumed by SRS to be excreted 

in a 24-hr period). 

Because of the nature of the work at SRS, intakes could have been chronic or acute. However, a 

series of acute intakes can be approximated as a chronic intake. Therefore, intakes were assumed 

to be chronic and to occur through inhalation with a default breathing rate of 1.2 m3

/hr and a 

5-μm activity median aerodynamic diameter particle size distribution. 

IMBA was used to fit the bioassay results to a series of inhalation intakes. Data were fit as a 

series of chronic intakes. The intake assumptions were based on observed patterns in the 

bioassay data. Periods with constant chronic intake rates were chosen by the selection of periods 

in which the bioassay results were similar. A new chronic intake period was started if the data 

indicated a significant sustained change in the bioassay results. By this method, the years from 

1973 through 1987 were divided into two chronic intake periods. 

Each chronic intake was fit independently using only the bioassay results from the single intake 

period for types M and S solubility. Excluded results are shown in red or dark gray in the figures 

in Attachment D; included results are shown in blue or light gray. The results of the statistical 

analysis that was used to calculate the intakes are provided in Tables 3 and 4. 

Table 3. Intake modeling results, dpm/d, type M

Years DuPont 

GM

DuPont 

84th

DuPont 

GSD

DuPont 

95th Suba GM Sub 84th Sub GSD Sub 95th

1973–1978 0.7732 4.565 5.90 14.349 0.325 2.277 7.01 8.00

1979–1987 1.426 6.251 4.38 16.215 1.293 6.660 5.15 19.17

a. Sub = subcontractor. 

Table 4. Intake modeling results, dpm/d, type S

Years DuPont 

GM

DuPont 

84th

DuPont 

GSD

DuPont 

95th Suba GM Sub 84th Sub GSD Sub 95th

1973–1978 15.71 88.27 5.62 268.7 6.97 48.5 6.95 169.4

1979–1987 26.38 110.7 4.20 279.2 22.65 114.6 5.06 326.1

a. Sub = subcontractor. 

CONCLUSION

As can be seen by examination of the tables above, the geometric mean (GM) of the results for 

the DuPont CTWs are higher than that for the subcontractor CTWs for all years evaluated. For 

the 1973 through 1978 period, the 95th percentile intake results for the DuPont CTWs are higher 

as well. For the 1979 through 1987 period, the subcontractor CTWs do have a higher 95th

percentile due to the higher geometric standard deviation (GSD) of the data. 
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 7 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

Based on the premise that exposure conditions for DuPont and subcontractor CTWs were similar 

and the review of the bioassay results, TWOPOS data, and intake modeling for prime and 

subcontractor CTWs presented in this white paper, NIOSH believes it is reasonable to combine 

all CTWs into a single stratum for assignment of intakes in the SRS internal dose coworker 

study.
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 8 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

REFERENCES

DuPont (E. I. du Pont de Nemours and Company), 1971–1979, Logbook Bioassay Resamples 

1971-1979, Savannah River Laboratory, Aiken, South Carolina. [SRDB Ref ID: 147211] 

DuPont (E. I. du Pont de Nemours and Company), 1973–1974, Pu Record Book #10 1-24-1973 

thru 2-8-1974, Savannah River Laboratory, Aiken, South Carolina. [SRDB Ref ID: 56736] 

DuPont (E. I. du Pont de Nemours and Company), 1973–1979, Pu-Am Record Book 10-22-1973 

thru 2-1-1979, Savannah River Laboratory, Aiken, South Carolina. [SRDB Ref ID: 51970] 

DuPont (E. I. du Pont de Nemours and Company), 1974–1979, Pu-EU Record Book, 1-14-1974 

to 12-13-1979, Savannah River Site, Aiken, South Carolina. [SRDB Ref ID: 53272] 

DuPont (E. I. du Pont de Nemours and Company), 1974, Pu Record Book #11 2-13-1974 to 12-

13-1974, Savannah River Laboratory, Aiken, South Carolina. [SRDB Ref ID: 56746] 

DuPont (E. I. du Pont de Nemours and Company), 1975, Pu Record Book #12 1-1-1975 to 10-2-

1975, Savannah River Laboratory, Aiken, South Carolina. [SRDB Ref ID: 51739] 

DuPont (E. I. du Pont de Nemours and Company), 1975–1976, Pu Record Book #13 10-23-1975 

to 10-21-1976, Savannah River Laboratory, Aiken, South Carolina. [SRDB Ref ID: 53263] 

DuPont (E. I. du Pont de Nemours and Company), 1977–1978, Pu Record Book #15 9-28-1977 

to 10-11-1978, Savannah River Laboratory, Aiken, South Carolina. [SRDB Ref ID: 56728] 

DuPont (E. I. du Pont de Nemours and Company), 1978–1979, Pu Record Book 16, 10-12-1978 

to 6-12-1979, Savannah River Site, Aiken, South Carolina. [SRDB Ref ID: 56840] 

DuPont (E. I. du Pont de Nemours and Company), 1979–1980a, Pu Record Book 17, 1-13-1979 

to 3-10-1980, Savannah River Site, Aiken, South Carolina. [SRDB Ref ID: 51735] 

DuPont (E. I. du Pont de Nemours and Company), 1979–1980b, Pu-Am Record Book, 2-2-1979 

to 7-7-1980, Savannah River Site, Aiken, South Carolina. [SRDB Ref ID: 52018] 

DuPont (E. I. du Pont de Nemours and Company), 1980a, Pu Record Book 18, 3-12-1980 to 7-

18-1980, Savannah River Site, Aiken, South Carolina. [SRDB Ref ID: 51887] 

DuPont (E. I. du Pont de Nemours and Company), 1980b, Pu Record Book 19, 7-14-1980 to 9-

12-1980, Savannah River Site, Aiken, South Carolina. [SRDB Ref ID: 51960] 

DuPont (E. I. du Pont de Nemours and Company), 1980c, Pu Record Book 20, 9-13-1980 to 12-

31-1980, Savannah River Site, Aiken, South Carolina. [SRDB Ref ID: 51961] 
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

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This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

DuPont (E. I. du Pont de Nemours and Company), 1981a, Pu Record Book 22, 6-8-1981 to 6-16-

1981, Savannah River Site, Aiken, South Carolina. [SRDB Ref ID: 51959] 

DuPont (E. I. du Pont de Nemours and Company), 1981b, Pu Record Book 21, 1-1-1981 to 6-5-

1981, Savannah River Site, Aiken, South Carolina. [SRDB Ref ID: 51967] 

DuPont (E. I. du Pont de Nemours and Company), 1980–1981a, Pu-EU Record Book 4, 7-15-

1980 to 7-14-1981, Savannah River Site, Aiken, South Carolina. [SRDB Ref ID: 53269] 

DuPont (E. I. du Pont de Nemours and Company), 1980–1981b, Pu-Am #3 Record Book, 8-30-

1980 to 8-22-1981, Savannah River Site, Aiken, South Carolina. [SRDB Ref ID: 52015] 

DuPont (E. I. du Pont de Nemours and Company), 1980–1989, Pu-Eu Record Book 1-3-1980 

thru 5-1-1989, Savannah River Laboratory, Aiken, South Carolina. [SRDB Ref ID: 53284] 

DuPont (E. I. du Pont de Nemours and Company), 1981–1986, Pu-Am Record Book 10-23-1981 

thru 6-9-1986, Savannah River Laboratory, Aiken, South Carolina. [SRDB Ref ID: 53283] 

DuPont (E. I. du Pont de Nemours and Company), 1983, Pu Record Book 25 1-3-1983 thru 9-4-

1983, Savannah River Laboratory, Aiken, South Carolina. [SRDB Ref ID: 49635] 

DuPont (E. I. du Pont de Nemours and Company), 1983–1984, Pu Record Book 26 9-5-1983 to 

6-2-1984, Savannah River Laboratory, Aiken, South Carolina. [SRDB Ref ID: 52072] 

DuPont (E. I. du Pont de Nemours and Company), 1983–1985, Pu Book 27, Savannah River 

Laboratory, Aiken, South Carolina. [SRDB Ref ID: 172166] 

DuPont (E. I. du Pont de Nemours and Company), 1984–1986, Pu Book 1, Savannah River 

Laboratory, Aiken, South Carolina. [SRDB Ref ID: 172161] 

DuPont (E. I. du Pont de Nemours and Company), 1985–1986, Pu Book 28, Savannah River 

Laboratory, Aiken, South Carolina. [SRDB Ref ID: 172169] 

DuPont (E. I. du Pont de Nemours and Company), 1986, Pu Book 2, Savannah River Laboratory, 

Aiken, South Carolina. [SRDB Ref ID: 172160] 

DuPont (E. I. du Pont de Nemours and Company), 1986–1987a, US Testing Bioassay Received 

Reports 1986-1987, Savannah River Laboratory, Aiken, South Carolina. [SRDB Ref ID: 

147225] 

DuPont (E. I. du Pont de Nemours and Company), 1986–1987b, Pu Book 3, Savannah River 

Laboratory, Aiken, South Carolina. [SRDB Ref ID: 172162] 
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Stratification Refinement

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This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

DuPont (E. I. du Pont de Nemours and Company), 1986–1988, Pu Book 31, Savannah River 

Laboratory, Aiken, South Carolina. [SRDB Ref ID: 172171] 

DuPont (E. I. du Pont de Nemours and Company), 1986–1989, Pu-Am Record Book 6-25-1986 

thru 8-9-1989, Savannah River Laboratory, Aiken, South Carolina. [SRDB Ref ID: 52022] 

DuPont (E. I. du Pont de Nemours and Company), 1986–1990, Pu Record Book (U.S. Testing) 

1986 to 1990, Savannah River Laboratory, Aiken, South Carolina. [SRDB Ref ID: 49639] 

ORAUT (Oak Ridge Associated Universities Team), 2014, Analysis of Stratified Coworker 

Datasets, ORAUT-RPRT-0053, Rev. 02, Oak Ridge, Tennessee, October 8. [SRDB Ref ID: 

136245] 

ORAUT (Oak Ridge Associated Universities Team), 2016, Internal Coworker Dosimetry Data 

for the Savannah River Site, ORAUT-OTIB-0081, Rev. 03, Oak Ridge, Tennessee, November 

22. [SRDB Ref ID: 163843] 

ORAUT (Oak Ridge Associated Universities Team), 2019, Internal Coworker Dosimetry Data 

for the Savannah River Site, ORAUT-OTIB-0081, Rev. 04, Oak Ridge, Tennessee, March 13. 

[SRDB Ref ID: 175614] 
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Stratification Refinement

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This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

ATTACHMENT A: REGRESSION COEFFICIENT PLOTS

The regression coefficient plots in this attachment were used to convert dpm/disc results to 

dpm/1.5L values when only the dpm/disc value was reported. The plots are the annual 

regressions of the dpm/1.5L values on their corresponding dpm/disc values for results where 

both values were present. Ideally, these pairs of values would fall on a straight line, and the 

regression parameters would reveal the conversion from dpm/disc to dpm/1.5L. For results 

where the dpm/disc value was available but not the corresponding dpm/1.5L value, the annual 

regression parameters were used to calculate the dpm/1.5L value.

Figure A1. 1974 Regression coefficient fit plot.
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This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure A2. 1977 Regression coefficient fit plot.
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This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure A3. 1980 Regression coefficient fit plot.
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Page 14 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure A4. 1983 Regression coefficient fit plot.
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This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure A5. 1986 Regression coefficient fit plot.
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Page 16 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

ATTACHMENT B: ROS FIT PLOTS

Figure B1. ROS fit to 1974 DuPont CTW TWOPOS data.
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This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure B2. ROS fit to 1974 subcontractor CTW TWOPOS data.
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Stratification Refinement

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This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure B3. ROS fit to 1977 DuPont CTW TWOPOS data.
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

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This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure B4. ROS fit to 1977 subcontractor CTW TWOPOS data.
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 20 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure B5. ROS fit to 1980 DuPont CTW TWOPOS data.
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Stratification Refinement

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This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure B6. ROS fit to 1980 subcontractor CTW TWOPOS data.
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Stratification Refinement

May 28, 2019

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This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure B7. ROS fit to 1983 DuPont CTW TWOPOS data.
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 23 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure B8. ROS fit to 1983 subcontractor CTW TWOPOS data.
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 24 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure B9. ROS fit to 1986 DuPont CTW TWOPOS data.
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 25 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure B10. ROS fit to 1986 subcontractor CTW TWOPOS data.
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 26 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

ATTACHMENT C: BOX PLOTS

Censored and maximum possible percentile plots using TWOPOS data were developed for 

comparison of prime (DuPont) and subcontractor CTW workers. These are not traditional box 

plots, as censored TWOPOS results are included in the dataset. Censored box plots replace the 

censored results with the lognormal quantile associated with the plotting position of the censored 

result. This means there are no results of zero, so a log scale plot is possible. The maximum 

possible percentile plots use the censored results at face value (simply dropping the <) to make 

box plots. There are results of zero, so a log scale is not possible for the maximum possible 

percentile plot. In every plot, the bottom whisker of the box plot extends to the 5th percentile, 

while the upper whisker extends to the 95th percentile, and there is a horizontal line at 0.1 dpm/d 

for comparison with the censoring level for plutonium in urine. 

Figure C1. Censored data box plots showing full data range.
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This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure C2. Censored data box plots zoomed in.
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Stratification Refinement

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Page 28 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure C3. Censored data box plots showing full data range, log scale.
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

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Page 29 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure C4. Maximum possible percentile data box plots showing full data range.
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 30 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure C5. Maximum possible percentile data box plots zoomed in.
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 31 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

ATTACHMENT D: INTAKE MODELING PLOTS

Figure D1. DuPont CTW predicted plutonium bioassay results calculated using IMBA-derived plutonium 

intake rates (line) compared with measured bioassay results (dots), 50th percentile, 1973 to 1978, type M.

Figure D2. DuPont CTW predicted plutonium bioassay results calculated using IMBA-derived plutonium 

intake rates (line) compared with measured bioassay results (dots), 50th percentile, 1979 to 1987, type M.
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 32 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure D3. DuPont CTW predicted plutonium bioassay results calculated using IMBA-derived plutonium 

intake rates (line) compared with measured bioassay results (dots), 84th percentile, 1973 to 1978, type M.

Figure D4. DuPont CTW predicted plutonium bioassay results calculated using IMBA-derived plutonium 

intake rates (line) compared with measured bioassay results (dots), 84th percentile, 1979 to 1987, type M.
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 33 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure D5. DuPont CTW predicted plutonium bioassay results calculated using IMBA-derived plutonium 

intake rates (line) compared with measured bioassay results (dots), 50th percentile, 1973 to 1978, type S.

Figure D6. DuPont CTW predicted plutonium bioassay results calculated using IMBA-derived plutonium 

intake rates (line) compared with measured bioassay results (dots), 50th percentile, 1979 to 1987, type S.
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 34 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure D7. DuPont CTW predicted plutonium bioassay results calculated using IMBA-derived plutonium 

intake rates (line) compared with measured bioassay results (dots), 84th percentile, 1973 to 1978, type S.

Figure D8. DuPont CTW predicted plutonium bioassay results calculated using IMBA-derived plutonium 

intake rates (line) compared with measured bioassay results (dots), 84th percentile, 1979 to 1987, type S.
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 35 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure D9. Subcontractor CTW predicted plutonium bioassay results calculated using IMBA-derived 

plutonium intake rates (line) compared with measured bioassay results (dots), 50th percentile, 1973 to 1978, 

type M.

Figure D10. Subcontractor CTW predicted plutonium bioassay results calculated using IMBA-derived 

plutonium intake rates (line) compared with measured bioassay results (dots), 50th percentile, 1979 to 1987, 

type M.
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 36 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure D11. Subcontractor CTW predicted plutonium bioassay results calculated using IMBA-derived 

plutonium intake rates (line) compared with measured bioassay results (dots), 84th percentile, 1973 to 1978, 

type M.

Figure D12. Subcontractor CTW predicted plutonium bioassay results calculated using IMBA-derived 

plutonium intake rates (line) compared with measured bioassay results (dots), 84th percentile, 1979 to 1987, 

type M.
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 37 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure D13. Subcontractor CTW predicted plutonium bioassay results calculated using IMBA-derived 

plutonium intake rates (line) compared with measured bioassay results (dots), 50th percentile, 1973 to 1978, 

type S.

Figure D14. Subcontractor CTW predicted plutonium bioassay results calculated using IMBA-derived 

plutonium intake rates (line) compared with measured bioassay results (dots), 50th percentile, 1979 to 1987, 

type S.
White Paper Savannah River Site Plutonium Construction Trade Worker 

Stratification Refinement

May 28, 2019

Page 38 of 38

This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions 

with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or 

ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary 

positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any 

information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

 

Figure D15. Subcontractor CTW predicted plutonium bioassay results calculated using IMBA-derived 

plutonium intake rates (line) compared with measured bioassay results (dots), 84th percentile, 1973 to 1978,

type S.

Figure D16. Subcontractor CTW predicted plutonium bioassay results calculated using IMBA-derived 

plutonium intake rates (line) compared with measured bioassay results (dots), 84th percentile, 1979 to 1987, 

type S.