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OCAS Meeting Report 7/19/01
Topic: Discussion with MJW Corp. regarding lessons learned from the Mound internal dose
reconstruction project
Date/Location: July 19, 2001; Cincinnati - NIOSH / Hamilton
Attendees (Affiliation):
Larry Elliott; Greg Lotz, Jim Neton, Mary Schubauer-Berigan, Randy Smith,
Ted Katz (NIOSH / OCAS)
Tim Taulbee, Thurman Wenzl, Steve Ahrenholz, Cynthia Robinson (NIOSH / HERB)
Jim Griffin, Dave Dooley, Liz Brackett (MJW Corp.)

General summary: MJW provided an overview of their experience with the reconstruction of
internal doses at the DOE Mound facility in Miamisburg, Ohio. A presentation provided by Liz
Brackett and Dave Dooley covered their approach to this project and a discussion issues
encountered by MJW in estimating doses for a cohort of workers employed at Mound between
1943 and 1985. A copy of the overheads used during the presentation are attached.

Specific findings

The project was divided into two phases - Phasel was devoted to data assembly and screening
while phase 2 was the actual dose assessment. Phase 1 took much longer than expected.

While 2°Pu and 2*Pu were the main radionucliudes of interest, exposure other radionuclides
were evaluated.

A screening process was used at the very beginning of the project to eliminate all workers with
internal exposures less than 20 rem.

All dose calculations, with the exception of Po, were performed using the ICRP 30 models.
For polonium, the ICRP 66 lung model was used. All doses were calculated as 50 year
committed effective dose equivalents. This calculation is incompatible with the needs of OCAS
which must calculate the annual dose equivalent received by the organ of interest from the time
of first covered employment period to the date of cancer diagnosos.

During the records review process, they encountered a number of record formats, many of which
were difficult to interpret without resorting to workers with institutional memory. The sources
of these records was quite varied. For their project, air sample results were not found to be
particularly useful. Not until they were well into the project did they discover a useful collection
of records at Los Alamos National Laboratory.

NIOSH should be aware of issues related to declassification requirement for documents and the
potential for contamination of records. Both of these can leads to an increase in the time and
expense required to perform a dose reconstruction. In particular, it took about 2 months to

1


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declassify a laboratory logbook.
The ORAU REACTS center is the designated archival center for all chelation documentation.
The project started with about 6,000 people, with about 1550 workers requiring assessments

using bioassay records. All dose reconstructions were based on an evalaution of the bioassay
results only.


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