(a) Section 223 of the Atomic Energy Act of 1954, as amended, provides for criminal sanctions for willful violation of, attempted violation of, or conspiracy to violate, any regulation issued under sections 161b, 161i, or 161o of the Act. For purposes of section 223, all the regulations in this part 37 are issued under one or more of sections 161b, 161i, or 161o, except for the sections listed in paragraph (b) of this section.
(b) The regulations in this part 37 that are not issued under sections 161b, 161i, or 161o for the purposes of section 223 are as follows: Sec. Sec. 37.1, 37.3, 37.5, 37.7, 37.9, 37.11, 37.13, 37.107, and 37.109.
Sec. Appendix A to Part 37--Category 1 and Category 2 Radioactive
Materials
Table 1--Category 1 and Category 2 Threshold
The terabecquerel (TBq) values are the regulatory standard. The curie (Ci) values specified are obtained by converting from the TBq value. The curie values are provided for practical usefulness only. ----------------------------------------------------------------------------------------------------------------
Category 1 Category 1 Category 2 Category 2
Radioactive material (TBq) (Ci) (TBq) (Ci)----------------------------------------------------------------------------------------------------------------Americium-241................................... 60 1,620 0.6 16.2Americium-241/Be................................ 60 1,620 0.6 16.2Californium-252................................. 20 540 0.2 5.40Cobalt-60....................................... 30 810 0.3 8.10Curium-244...................................... 50 1,350 0.5 13.5Cesium-137...................................... 100 2,700 1 27.0Gadolinium-153.................................. 1,000 27,000 10 270Iridium-192..................................... 80 2,160 0.8 21.6Plutonium-238................................... 60 1,620 0.6 16.2Plutonium-239/Be................................ 60 1,620 0.6 16.2Promethium-147.................................. 40,000 1,080,000 400 10,800Radium-226...................................... 40 1,080 0.4 10.8Selenium-75..................................... 200 5,400 2 54.0Strontium-90.................................... 1,000 27,000 10 270Thulium-170..................................... 20,000 540,000 200 5,400Ytterbium-169................................... 300 8,100 3 81.0----------------------------------------------------------------------------------------------------------------
Note: Calculations Concerning Multiple Sources or Multiple Radionuclides
The ''sum of fractions'' methodology for evaluating combinations of multiple sources or multiple radionuclides is to be used in determining whether a location meets or exceeds the threshold and is thus subject to the requirements of this part.
I. If multiple sources of the same radionuclide and/or multiple radionuclides are aggregated at a location, the sum of the ratios of the total activity of each of the radionuclides must be determined to verify whether the activity at the location is less than the category 1 or category 2 thresholds of Table 1, as appropriate. If the calculated sum of the ratios, using the equation below, is greater than or equal to 1.0, then the applicable requirements of this part apply.
II. First determine the total activity for each radionuclide from Table 1. This is done by adding the activity of each individual source, material in any device, and any loose or bulk material that contains the radionuclide. Then use the equation below to calculate the sum of the ratios by inserting the total activity of the applicable radionuclides from Table 1 in the numerator of the equation and the corresponding threshold activity from Table 1 in the denominator of the equation. Calculations must be performed in metric values (i.e., TBq) and the numerator and denominator values must be in the same units.R1 = total activity for radionuclide 1R2 = total activity for radionuclide 2RN = total activity for radionuclide nAR1 = activity threshold for radionuclide 1AR2 = activity threshold for radionuclide 2ARN = activity threshold for radionuclide n[GRAPHIC] [TIFF OMITTED] TR19MR13.000