N.H. Code Admin. R. He-P 4097.01
The threshold quantities tracked in this chapter shall be as stated in Table 4097.1 below.
Table 4097.1 Threshold Quantities
Radioactive Material
Category 1
(TBq)
Category 1
(Ci)
Category 2
(TBq)
Category 2
(Ci)
Actinium-227
20
540
0.2
5.4
Americium-241
60
1,600
0.6
16
Americium-241 /Be
60
1,600
0.6
16
Californium-252
20
540
0.2
5.4
Cobalt-60
30
810
0.3
8.1
Curium-244
50
1,400
0.5
14
Cesium-137
100
2,00
1
27
Gadolinium-153
1,000
27,000
10
270
Iridium-192
80
2,200
0.8
22
Plutonium-238
60
1,600
0.6
16
Plutonium-239 /Be
60
1,600
0.6
16
Polonium-210
60
1,600
0.6
16
Promethium-147
40,000
,100,000
400
11,000
Radium-226
40
1,100
0.4
11
Selenium-75
200
5,400
2
54
Strontium-90
1,000
27,000
10
270
Thorium-228
20
540
0.2
5.4
Thorium-229
20
540
0.2
5.4
Thulium-170
20,000
540,000
200
5,400
Ytterbium-169
300
8100
3
81
Source. #10604, eff 5-23-14; ss by #14013, eff 6-28-24