Code of Massachusetts Regulations
105 CMR - DEPARTMENT OF PUBLIC HEALTH
Title 105 CMR 120.000 - The Control of Radiation
REPORTS
Section 120.298 - Appendix D - Nationally Tracked Source Thresholds
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 and are rounded after conversion.
|
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 |
1600 |
0.6 |
16 |
|
Americium-241/Be |
60 |
1600 |
0.6 |
16 |
|
Californium-252 |
20 |
540 |
0.2 |
5.4 |
|
Cobalt-60 |
30 |
810 |
0.3 |
8.1 |
|
Curium-244 |
50 |
1400 |
0.5 |
14 |
|
Cesium-137 |
100 |
2700 |
1 |
27 |
|
Gadolinium-153 |
1000 |
27000 |
10 |
270 |
|
Iridium-192 |
80 |
2200 |
0.8 |
22 |
|
Plutonium-238 |
60 |
1600 |
0.6 |
16 |
|
Plutonium-239/Be |
60 |
1600 |
0.6 |
16 |
|
Polonium-210 |
60 |
1600 |
0.6 |
16 |
|
Promethium-147 |
40000 |
1100000 |
400 |
11000 |
|
Radium-226 |
40 |
1100 |
0.4 |
11 |
|
Selenium-75 |
200 |
5400 |
2 |
54 |
|
Strontium-90 |
1000 |
27000 |
10 |
270 |
|
Thorium-228 |
20 |
540 |
0.2 |
5.4 |
|
Thorium-229 |
20 |
540 |
0.2 |
5.4 |
|
Thulium-170 |
20000 |
540000 |
200 |
5400 |
|
Ytterbium-169 |
300 |
8100 |
3 |
81 |
