Statutes, codes, and regulations
Code of Federal Regulations
Title 10 - ENERGYChapter III - DEPARTMENT OF ENERGY
Part 835 - OCCUPATIONAL RADIATION PROTECTION
Appendix E to Part 835 - Values for Establishing Sealed Radioactive Source Accountability and Radioactive Material Posting and Labeling Requirements

10 C.F.R. § 835 app E to Part 835

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Appendix E to Part 835 - Values for Establishing Sealed Radioactive Source Accountability and Radioactive Material Posting and Labeling Requirements

The data presented in appendix E are to be used for identifying accountable sealed radioactive sources and radioactive material areas as those terms are defined at § 835.2(a) , establishing the need for radioactive material area posting in accordance with § 835.603(g) , and establishing the need for radioactive material labeling in accordance with § 835.605 .

Nuclide Activity ([MICRO]Ci)
H-31.5E + 08
Be-73.1E + 03
Be-101.4E + 05
C-144.6E + 06
Na-221.9E + 01
Al-261.5E + 01
Si-324.9E + 04
S-352.4E + 06
Cl-365.2E + 05
K-402.7E + 02
Ca-419.3E + 06
Ca-451.1E + 06
Sc-466.2E + 01
Ti-441.5E + 02
V-491.0E + 08
Mn-537.5E + 07
Mn-546.5E + 01
Fe-552.9E + 06
Fe-591.9E + 02
Fe-608.1E + 03
Co-563.9E + 01
Co-572.3E + 02
Co-581.3E + 02
Co-601.7E + 01
Ni-593.2E + 06
Ni-631.3E + 06
Zn-651.1E + 02
Ge-685.6E + 02
As-735.3E + 02
Se-756.3E + 01
Se-798.7E + 05
Rb-839.1E + 01
Rb-842.0E + 02
Sr-851.2E + 02
Sr-894.8E + 05
Sr-903.5E + 04
Y-883.3E + 01
Y-915.0E + 04
Zr-881.1E + 02
Zr-939.3E + 04
Zr-951.9E + 02
Nb-916.9E + 01
Nb-91m3.6E + 02
Nb-921.8E + 01
Nb-93m4.4E + 02
Nb-942.3E + 01
Nb-953.4E + 02
Mo-937.7E + 01
Tc-95m1.3E + 02
Tc-978.1E + 01
Tc-97m3.5E + 02
Tc-982.5E + 01
Tc-998.4E + 05
Ru-1034.4E + 02
Ru-1062.5E + 02
Rh-1018.7E + 05
Rh-1026.4E+05
Rh-102m3.0E+05
Pd-1079.3E + 06
Ag-1053.3E + 06
Ag-108m1.8E + 01
Ag-110m2.2E + 01
Cd-1091.6E + 02
Cd-113m2.0E + 04
Cd-115m1.0E + 04
In-114m7.7E + 02
Sn-1133.1E + 02
Sn-119m3.3E + 02
Sn-121m8.1E + 05
Sn-1231.3E + 04
Sn-1261.8E + 02
Sb-1249.1E + 01
Sb-1256.7E + 01
Te-121m1.8E + 02
Te-123m2.8E + 02
Te-125m4.4E + 02
Te-127m8.0E + 02
Te-129m2.3E + 03
I-1253.5E + 02
I-1291.8E + 02
Cs-1342.6E + 01
Cs-1351.3E + 06
Cs-1376.0E + 01
Ba-1335.1E + 01
La-1372.7E + 05
Ce-1392.4E + 02
Ce-1412.4E + 03
Ce-1441.4E + 03
Pm-1431.3E + 02
Pm-1442.9E + 01
Pm-1452.6E + 02
Pm-1464.4E + 01
Pm-1477.7E + 05
Pm-148m1.0E + 02
Sm-1452.4E + 06
Sm-1464.0E + 02
Sm-1512.5E + 05
Eu-1481.1E + 06
Eu-1491.1E + 07
Eu-1523.1E + 01
Eu-1543.1E + 01
Eu-1553.6E + 02
Gd-1465.1E + 05
Gd-1489.0E + 01
Gd-1512.9E + 06
Gd-1532.1E + 02
Tb-1572.5E + 03
Tb-1589.0E + 04
Tb-1601.2E + 02
Dy-1591.0E + 07
Ho-166m2.1E + 01
Tm-1708.4E + 03
Tm-1712.8E + 04
Yb-1695.5E + 02
Lu-1731.8E + 06
Lu-1749.3E + 05
Lu-174m1.0E + 06
Lu-177m5.8E + 01
Hf-1727.3E + 04
Hf-1753.0E + 06
Hf-178m8.7E + 03
Hf-1813.4E + 02
Hf-1827.5E + 03
Ta-1799.3E + 06
Ta-1827.3E + 01
W-1811.0E + 03
W-1853.9E + 06
W-1886.3E + 04
Re-1835.3E + 02
Re-1842.6E + 02
Re-184m1.5E + 02
Re-186m3.4E + 05
Os-1851.3E + 02
Os-1946.4E + 04
Ir-1921.3E + 02
Ir-192m1.4E + 05
Ir-194m2.7E + 01
Pt-1938.7E + 07
Au-1954.8E + 02
Hg-1945.2E + 04
Hg-2034.9E + 02
Tl-2042.2E + 04
Pb-2021.9E + 05
Pb-2059.0E + 01
Pb-2109.2E + 01
Bi-2071.7E + 01
Bi-2081.5E + 01
Bi-210m1.2E + 03
Po-2096.3E + 03
Po-2101.2E + 03
Ra-2262.2E + 02
Ra-2281.5E + 03
Ac-2274.2E + 00
Th-2288.4E + 01
Th-2293.1E + 01
Th-2305.4E + 00
Th-2329.3E + 01
Pa-2313.0E + 01
U-2321.0E + 02
U-2333.9E + 02
U-2342.9E + 02
U-2356.7E + 01
U-2363.1E + 02
U-2383.5E + 02
Np-2351.1E + 02
Np-2362.1E + 01
Np-2374.9E + 01
Pu-2362.0E + 02
Pu-2373.3E + 02
Pu-2389.0E + 01
Pu-2398.4E + 01
Pu-2408.4E + 01
Pu-2414.6E + 03
Pu-2428.7E + 01
Pu-2449.0E + 01
Am-2417.2E + 01
Am-242m1.1E + 02
Am-2437.3E + 01
Cm-2411.0E + 05
Cm-2426.2E + 02
Cm-2434.8E + 01
Cm-2441.5E + 02
Cm-2455.0E + 01
Cm-2461.0E + 02
Cm-2478.5E + 01
Cm-2482.8E + 01
Cm-2505.4E + 00
Bk-2476.0E + 01
Bk-2492.7E + 04
Cf-2484.4E + 02
Cf-2495.5E + 01
Cf-2501.2E + 02
Cf-2515.3E + 01
Cf-2525.2E + 00
Cf-2541.2E + 02
Es-2546.3E + 01
Es-2558.8E + 03
Fm-2575.1E + 02
Md-2586.1E + 02

Any alpha emitting radionuclide not listed in appendix E and mixtures of alpha emitters of unknown composition have a value of 10 [MICRO]Ci.

With the exception that any type of STC has a value of 10 Ci, any radionuclide other than alpha emitting radionuclides not listed in appendix E and mixtures of beta emitters of unknown composition have a value of 100 [MICRO]Ci.

10 C.F.R. 835 app E to Part 835

72 FR 31940, June 8, 2007, as amended at 82 FR 37514, Aug. 11, 2017
82 FR 37514, 9/11/2017

Where there is involved a mixture of radionuclides in known amounts, derive the value for the mixture as follows: determine, for each radionuclide in the mixture, the ratio between the quantity present in the mixture and the value otherwise established for the specific radionuclide when not in the mixture. If the sum of such ratios for all radionuclides in the mixture exceeds unity (1), then the accountability criterion has been exceeded.