49 C.F.R. § 173.434
Current through May 31, 2024
The table of activity-mass relationships for uranium and natural thorium are as follows:
| Thorium and uranium enrichment 1(Wt%235U 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