Source: https://www.law.cornell.edu/cfr/text/10/appendix-C_to_part_835
Timestamp: 2017-02-28 06:01:39
Document Index: 175583791

Matched Legal Cases: ['art 835', 'art 835', 'art_835', 'art 835', 'art 835', '§ 835', '§ 835', '§ 835', '§ 2201', '§ 7191', '§ 2410', 'art 835', 'art 835', 'art 835']

10 CFR Appendix C to Part 835, Derived Air Concentration (DAC) for Workers From External Exposure During Immersion in a Cloud of Airborne Radioactive Material | US Law | LII / Legal Information Institute
CFR › Title 10 › Chapter III › Part 835 › Subpart N › Appendix C_to_part_835 10 CFR Appendix C to Part 835, Derived Air Concentration (DAC) for Workers From External Exposure During Immersion in a Cloud of Airborne Radioactive Material
Appendix C to Part 835 - Derived Air Concentration (DAC) for Workers From External Exposure During Immersion in a Cloud of Airborne Radioactive Material a. The data presented in appendix C are to be used for controlling occupational exposures in accordance with § 835.209, identifying the need for air monitoring in accordance with § 835.403 and identifying the need for posting of airborne radioactivity areas in accordance with § 835.603(d).
b. The air immersion DAC values shown in this appendix are based on a stochastic dose limit of 5 rems (0.05 Sv) per year. Four columns of information are presented: (1) Radionuclide; (2) half-life in units of seconds (s), minutes (min), hours (h), days (d), or years (yr); (3) air immersion DAC in units of µCi/mL; and (4) air immersion DAC in units of Bq/m3. The data are listed by radionuclide in order of increasing atomic mass. The air immersion DACs were calculated for a continuous, nonshielded exposure via immersion in a semi-infinite cloud of airborne radioactive material. The DACs listed in this appendix may be modified to allow for submersion in a cloud of finite dimensions.
c. The DAC values are given for individual radionuclides. For known mixtures of radionuclides, determine the sum of the ratio of the observed concentration of a particular radionuclide and its corresponding DAC for all radionuclides in the mixture. If this sum exceeds unity (1), then the DAC has been exceeded. For unknown radionuclides, the most restrictive DAC (lowest value) for those isotopes not known to be absent shall be used.
Air Immersion DAC
(µCi/mL)
(Bq/m
35.02 d
1E 11
269 yr
5E 07
1.827 h
1E 05
Kr-74
Kr-76
3E 05
Kr-77
74.7 min
35.04 h
6E 05
2.1E 05 yr
2E 07
Kr-83m
7E-02
2E 09
10.72 yr
1E 06
76.3 min
2.84 h
Xe-121
Xe-122
20.1 h
3E 06
2.14 h
2E 05
Xe-125
36.406 d
Xe-129m
8.89 d
7E 06
11.84 d
5E-04
1E 07
5.245 d
5E 06
2.19 d
9.11 h
Xe-135m
15.36 min
Xe-138
For any single radionuclide not listed above with decay mode other than alpha emission or spontaneous fission and with radioactive half-life less than two hours, the DAC value shall be 6 E-06 µCi/mL (2 E 04 Bq/m
[ 72 FR 31940, June 8, 2007, as amended at 76 FR 20489, Apr. 13, 2011]
This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.This list is taken from the Parallel Table of Authorities and Rules provided by GPO [Government Printing Office].It is not guaranteed to be accurate or up-to-date, though we do refresh the database weekly. More limitations on accuracy are described at the GPO site.United States CodeU.S. Code: Title 42 - THE PUBLIC HEALTH AND WELFARE§ 2201 - General duties of Commission§ 7191 - Procedures for issuance of rules, regulations, or orders
U.S. Code: Title 50 - WAR AND NATIONAL DEFENSE§ 2410 - Status of Administration and contractor personnel within Department of Energy
Title 10 published on 2015-12-04The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 10 CFR Part 835 after this date.2016-11-18; vol. 81 # 223 - Friday, November 18, 201681 FR 81701 - Occupational Radiation Protection
typeregulations.gov FR Doc.2016-27510 RIN1992-AA51 Docket No.AU-RM-16-ORP DEPARTMENT OF ENERGY, Safety and Security, Office of Environment, Health Notice of proposed rulemaking. The comment period for this proposed rule will end on December 19, 2016. 10 CFR Part 835 SummaryThe U.S. Department of Energy (DOE) proposes to amend the values listed in two appendices to its current occupational radiation protection regulations. The proposed amendment to appendix C would correct the derived air concentration value for any single radionuclide not listed in the appendix C table with a decay mode other than alpha emission or spontaneous fission and with radioactive half-life less than two hours, adjusted for an 8-hr work day. The proposed amendments to appendix E would correct the activity information of two radionuclides, Rh-102 and Rh-102m.
Title 10 published on 2015-12-04.No entries appear in the Federal Register after this date, for 10 CFR Part 835.