Radionuclide | Category 1 (TBq)1,2 | Category 1 (Ci)1,2 | Category 2 (TBq)1,2 | Category 2 (Ci)1,2 |
Am-241 | 60 | 1,620 | 0.6 | 16.2 |
Am-241/Be | 60 | 1,620 | 0.6 | 16.2 |
Cf-252 | 20 | 540 | 0.2 | 5.4 |
Cm-244 | 50 | 1,350 | 0.5 | 13.5 |
Co-60 | 30 | 810 | 0.3 | 8.1 |
Cs-137 | 100 | 2,700 | 1 | 27 |
Gd-153 | 1,000 | 27,000 | 10 | 270 |
Ir-192 | 80 | 2,160 | 0.8 | 21.6 |
Pm-147 | 40,000 | 1,080,000 | 400 | 10,800 |
Pu-238 | 60 | 1,620 | 0.6 | 16.2 |
Pu-239/Be | 60 | 1,620 | 0.6 | 16.2 |
Ra-226 | 40 | 1,080 | 0.4 | 10.8 |
Se-75 | 200 | 5,400 | 2 | 54 |
Sr-90 (Y-90) | 1,000 | 27,000 | 10 | 270 |
Tm-170 | 20,000 | 540,000 | 200 | 5,400 |
Yb-169 | 300 | 8,100 | 3 | 81 |
Combinations of radioactive materials listed in this table3 | See footnote 4 | |||
1The aggregate activity of multiple, collocated sources of the same radionuclides should be included when the total activity equals or exceeds the Category 1 or Category 2 threshold. 2The primary values used for compliance are TBq. The curie (Ci) values are rounded to two significant figures for informational purposes only. 3Radioactive materials are to be considered aggregated or collocated if breaching a common physical barrier (e.g., a locked door at the entrance to a storage room) would allow access to the radioactive material or devices containing the radioactive material. 4If several radionuclides are aggregated, the sum of the ratios of the activity of each source, i of radionuclide, n, A (i,n), to the Category 1 or Category 2 threshold for radionuclide n, Qn, listed for that radionuclide equals or exceeds one. (aggregated source activity for radionuclide A) / (quantities of concern for radionuclide A) + (aggregated source activity for radionuclide B) / (quantities of concern for radionuclide B) + etc... >=1. |
12 Va. Admin. Code § 5-481-451
Statutory Authority: § 32.1-229 of the Code of Virginia.