Washington Administrative Code
Title 246 - Health, Department of
RADIATION
Chapter 246-221 - Radiation protection standards
Section 246-221-236 - 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 |
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 |
|
Cesium-137 |
100 |
2,700 |
1 |
27 |
|
Curium-244 |
50 |
1,400 |
0.5 |
14 |
|
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 |
1,100,000 |
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 |
8,100 |
3 |
81 |
Statutory Authority: RCW 70.98.050 and 70.98.080. 09-06-003, § 246-221-236, filed 2/18/09, effective 3/21/09.
