49 C.F.R. § 173.434
Current through September 30, 2024
The table of activity-mass relationships for uranium and natural thorium are as follows:
| Thorium and uranium enrichment1(Wt%235 U present) | Specific activity | |||
| TBq/gram | Grams/Tbq | Ci/gram | Grams/Ci | |
| 0.45 (depleted) | 1.9 * 10-8 | 5.4 * 107 | 5.0 * 10-7 | 2.0 * 106 |
| 0.72 (natural) | 2.6 * 10-8 | 3.8 * 107 | 7.1 * 10-7 | 1.4 * 106 |
| 1.0 | 2.8 * 10-8 | 3.6 * 107 | 7.6 * 10-7 | 1.3 * 106 |
| 1.5 | 3.7 * 10-8 | 2.7 * 107 | 1.0 * 10-6 | 1.0 * 106 |
| 5.0 | 1.0 * 10-7 | 1.0 * 107 | 2.7 * 10-6 | 3.7 * 105 |
| 10.0 | 1.8 * 10-7 | 5.6 * 106 | 4.8 * 10-6 | 2.1 * 105 |
| 20.0 | 3.7 * 10-7 | 2.7 * 106 | 1.0 * 10-5 | 1.0 * 105 |
| 35.0 | 7.4 * 10-7 | 1.4 * 106 | 2.0 * 10-5 | 5.0 * 104 |
| 50.0 | 9.3 * 10-7 | 1.1 * 106 | 2.5 * 10-5 | 4.0 * 104 |
| 90.0 | 2.1 * 10-6 | 4.7 * 105 | 5.8 * 10-5 | 1.7 * 104 |
| 93.0 | 2.6 * 10-6 | 3.9 * 105 | 7.0 * 10-5 | 1.4 * 104 |
| 95.0 | 3.4 * 10-6 | 3.0 * 105 | 9.1 * 10-5 | 1.1 * 104 |
| Natural thorium | 8.1 * 10-9 | 1.2 * 108 | 2.2 * 10-7 | 4.6 * 106 |
1 The figures for uranium include representative values for the activity of uranium-234 which is concentrated during the enrichment process. The activity for thorium includes the equilibrium concentration of thorium-228.
49 C.F.R. §173.434