N.H. Code Admin. R. He-P 4038.31
Inspections
Effective Mar 24, 2023#11105, eff 5-25-16; ss by #13598, eff 3-24-23Former Division of Public Health Services
Each licensee shall make available to DHHS/RHS for inspection, upon reasonable notice, records kept by the licensee pertaining to its receipt, possession, use, acquisition, import, export, or transfer of category 1 or category 2 quantities of radioactive material.
Table 4038.1—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.
Radioactive material
Category 1(TBq)
Category 1(Ci)
Category 2(TBq)
Category 2(Ci)
Americium-241
60
1,620
0.6
16.2
Americium-241/Be
60
1,620
0.6
16.2
Californium-252
20
540
0.2
5.40
Cobalt-60
30
810
0.3
8.10
Curium-244
50
1,350
0.5
13.5
Cesium-137
100
2,700
1
27.0
Gadolinium-153
1,000
27,000
10
270
Iridium-192
80
2,160
0.8
21.6
Plutonium-238
60
1,620
0.6
16.2
Plutonium-239/Be
60
1,620
0.6
16.2
Promethium-147
40,000
1,080,000
400
10,800
Radium-226
40
1,080
0.4
10.8
Selenium-75
200
5,400
2
54.0
Strontium-90
1,000
27,000
10
270
Thulium-170
20,000
540,000
200
5,400
Ytterbium-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 4038.1, 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 4038.1. 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 4038.1 in the numerator of the equation and the corresponding threshold activity from Table 4038.1 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 1
R2 = total activity for radionuclide 2
RN = total activity for radionuclide n
AR1 = activity threshold for radionuclide 1
AR2 = activity threshold for radionuclide 2
ARN = activity threshold for radionuclide n
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Source. #11105, eff 5-25-16; ss by #13598, eff 3-24-23