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Page Title:
Table A.1 Thresholds for Radionuclides cont'd |
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|  DOE-STD-1027-92
ATTACHMENT 1
Isotope
Category 2
Threshold
Category 3
Threshold
Curies
Grams
Curies
Grams
U-233
2.2E+02***
2.3E+04***
4.2E+00
4.4E+02
U-234
2.2E+02
3.5E+04
4.2E+00
6.7E+02
U-235
2.4E+02***
1.1E+08***
4.2E+00
1.9E+06
U-238
2.4E+02
7.1E+08
4.2E+00
1.3E+07
Np-237
5.8E+01
8.3E+04
4.2E-01
6.0E+02
Np-238
9.1E+05
3.5E+00
1.3E+03
5.0E-03
Pu-238
6.2E+01
3.6E+00
6.2E-01
3.6E-02
Pu-239
5.6E+01***
9.0E+02***
5.2E-01
8.4E+00
Pu-241
2.9E+03
2.8E+01
3.2E+01
3.1E-01
Am-241
5.5E+01
1.6E+01
5.2E-01
1.5E-01
Am-242m
5.6E+01
5.8E+00
5.2E-01
5.3E-02
Am-243
5.5E+01
2.8E+02
5.2E-01
2.6E+00
Cm-242
1.7E+03
5.1E-01
3.2E+01
9.7E-03
Cm-245
5.3E+01
3.1E+02
5.2E-01
3.0E+00
Cf-252
2.2E+02
4.1E-01
3.2E+00
5.9E-03
For isotopes not listed below, users may refer to LA-12846-MS, Specific Activities and DOE-
1
STD-1027-92 Hazard Category 2 Thresholds, LANL Fact Sheet or to 10 CFR 30.72,
Schedule C and adjust the values consistent with the X/Q value described in Attachment 1 of
this Standard. (Note that although LA-12846-MS misstates the Category 2 threshold
criterion, its use of the proper X/Q negates any effect of the misstatement. See
"Radiological Criteria, p A-3 and Meteorological Conditions, p A-7 for clarification)
Any other beta-gamma emitter - 4.3E+05 Ci
Mixed fission products - 1.0E+03 Ci
Any other alpha emitter - 5.5E+01 Ci
2
For isotopes not listed below, users may refer to LA-12981-MS, Table of DOE-STD-1027-92
Hazard Category 3 Threshold Quantities for the ICRP-30 List of 757 Radionuclides, LANL
Fact Sheet for threshold quantities of any isotopes of interest.
At the recommendation of the Tritium Focus Group, the Category 3 tritium threshold value
*
has been increased from 1.0E+03 Ci and 1.0E-01 grams to 1.6E+04 Ci and 1.6E+00 grams,
consistent with the methodology of EPA used for the other nuclides.
**
Provided as an example to indicate that when a substance such as P 32 is used in a solution
(i.e., phosphoric acid) for experimentation, medical treatment, etc., it should no longer be
considered as highly volatile/combustible.
To be used only if segmentation or nature of process precludes potential for criticality.
***
Otherwise, use the criticality lists for U233, U235 and Pu239 of 500, 700, and 450 grams,
respectively.
A - 12
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