| Material | Specific Activity | A2 Quantity | ||
|---|---|---|---|---|
| natural uranium | 26 Bq/mg | 0.7 Ci per ton (Metric) | Unlimited | |
| Some other isotopes of interest: | ||||
| americium 241 | 0.13 TBq/g | 3.4 Ci/g | 0.0054 Ci | 1.6 mg |
| iodine 131 | 4.6 TBq/mg | 120 Ci/mg | 13.5 Ci | 11 mg |
| thallium 201 | 7.9 TBq/mg | 210 Ci/mg | 270 Ci | 1.3 mg |
| cobalt 60 | 42 TBq/g | 1.1 Ci/mg | 10.8 Ci | 10 mg |
| carbon 14 in natural air | 0.04 Bq/liter 0.03 Bq/g | 1 pCi/liter | 54 Ci (2 TBq) | 50 km^3 Ci |