49 CFR 173.434 – Activity-mass relationships for uranium and natural thorium
Current as of: 2024 | Check for updates
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The table of activity-mass relationships for uranium and natural thorium are as follows:
| Thorium and uranium enrichment 1(Wt% 235 U present) | Specific activity | |||
|---|---|---|---|---|
| TBq/gram | Grams/Tbq | Ci/gram | Grams/Ci | |
| 0.45 (depleted) | 1.9 × 10 | 5.4 × 107 | 5.0 × 10 | 2.0 × 106 |
| 0.72 (natural) | 2.6 × 10 | 3.8 × 107 | 7.1 × 10 | 1.4 × 106 |
| 1.0 | 2.8 × 10 | 3.6 × 107 | 7.6 × 10 | 1.3 × 106 |
| 1.5 | 3.7 × 10 | 2.7 × 107 | 1.0 × 10 | 1.0 × 106 |
| 5.0 | 1.0 × 10 | 1.0 × 107 | 2.7 × 10 | 3.7 × 105 |
| 10.0 | 1.8 × 10 | 5.6 × 106 | 4.8 × 10 | 2.1 × 105 |
| 20.0 | 3.7 × 10 | 2.7 × 106 | 1.0 × 10 | 1.0 × 105 |
| 35.0 | 7.4 × 10 | 1.4 × 106 | 2.0 × 10 | 5.0 × 104 |
| 50.0 | 9.3 × 10 | 1.1 × 106 | 2.5 × 10 | 4.0 × 104 |
| 90.0 | 2.1 × 10 | 4.7 × 105 | 5.8 × 10 | 1.7 × 104 |
| 93.0 | 2.6 × 10 | 3.9 × 105 | 7.0 × 10 | 1.4 × 104 |
| 95.0 | 3.4 × 10 | 3.0 × 105 | 9.1 × 10 | 1.1 × 104 |
| Natural thorium | 8.1 × 10 | 1.2 × 108 | 2.2 × 10 | 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.