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Highly Radioactive Sources Explained
high activity radioactive source means a radioactive source mentioned in an item in the below table that has an activity level, measured in Becquerel, that is equal to, or more than, the level specified in the item.
| Item | Radioactive source | Activity level (Bq) |
|---|---|---|
| 1 | Americium-241 | 6 × 1011 |
| 2 | Americium-241/Beryllium | 6 × 1011 |
| 3 | Caesium-137 | 1 × 1012 |
| 4 | Californium-252 | 2 × 1011 |
| 5 | Cobalt-60 | 3 × 1011 |
| 6 | Curium-244 | 5 × 1011 |
| 7 | Gadolinium-153 | 1 × 1013 |
| 8 | Iridium-192 | 8 × 1011 |
| 9 | Plutonium-238 | 6 × 1011 |
| 10 | Plutonium-239/Beryllium | 6 × 1011 |
| 11 | Promethium-147 | 4 × 1014 |
| 12 | Radium-226 | 4 × 1011 |
| 13 | Selenium-75 | 2 × 1012 |
| 14 | Strontium-90/Yttrium-90 | 1 × 1013 |
| 15 | Thulium-170 | 2 × 1014 |
| 16 | Ytterbium-169 | 3 × 1012 |