View all text of Subpart I [§ 173.401 - § 173.477]
§ 173.434 - Activity-mass relationships for uranium and natural thorium.
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 × 10 7 | 5.0 × 10 | 2.0 × 10 6 | 0.72 (natural) | 2.6 × 10 | 3.8 × 10 7 | 7.1 × 10 | 1.4 × 10 6 | 1.0 | 2.8 × 10 | 3.6 × 10 7 | 7.6 × 10 | 1.3 × 10 6 | 1.5 | 3.7 × 10 | 2.7 × 10 7 | 1.0 × 10 | 1.0 × 10 6 | 5.0 | 1.0 × 10 | 1.0 × 10 7 | 2.7 × 10 | 3.7 × 10 5 | 10.0 | 1.8 × 10 | 5.6 × 10 6 | 4.8 × 10 | 2.1 × 10 5 | 20.0 | 3.7 × 10 | 2.7 × 10 6 | 1.0 × 10 | 1.0 × 10 5 | 35.0 | 7.4 × 10 | 1.4 × 10 6 | 2.0 × 10 | 5.0 × 10 4 | 50.0 | 9.3 × 10 | 1.1 × 10 6 | 2.5 × 10 | 4.0 × 10 4 | 90.0 | 2.1 × 10 | 4.7 × 10 5 | 5.8 × 10 | 1.7 × 10 4 | 93.0 | 2.6 × 10 | 3.9 × 10 5 | 7.0 × 10 | 1.4 × 10 4 | 95.0 | 3.4 × 10 | 3.0 × 10 5 | 9.1 × 10 | 1.1 × 10 4 | Natural thorium | 8.1 × 10 | 1.2 × 10 8 | 2.2 × 10 | 4.6 × 10 6 |
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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.