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Code of Federal Regulations Title 49. Transportation § 49.173.434 Activity-mass relationships for uranium and natural thorium

Current as of January 02, 2025 | Updated by Findlaw Staff

The table of activity-mass relationships for uranium and natural thorium are as follows:

Thorium and uranium enrichment1 (Wt% 235U present)

Specific activity

TBq/gram

Grams/Tbq

Ci/gram

Grams/Ci

0.45 (depleted)․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

1.9x10-8

5.4x107

5.0x10-7

2.0x106

0.72 (natural)․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

2.6x10-8

3.8x107

7.1x10-7

1.4x106

1.0․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

2.8x10-8

3.6x107

7.6x10-7

1.3x106

1.5․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

3.7x10-8

2.7x107

1.0x10-6

1.0x106

5.0․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

1.0x10-7

1.0x107

2.7x10-6

3.7x105

10.0․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

1.8x10-7

5.6x106

4.8x10-6

2.1x105

20.0․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

3.7x10-7

2.7x106

1.0x10-5

1.0x105

35.0․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

7.4x10-7

1.4x106

2.0x10-5

5.0x104

50.0․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

9.3x10-7

1.1x106

2.5x10-5

4.0x104

90.0․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

2.1x10-6

4.7x105

5.8x10-5

1.7x104

93.0․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

2.6x10-6

3.9x105

7.0x10-5

1.4x104

95.0․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

3.4x10-6

3.0x105

9.1x10-5

1.1x104

Natural thorium․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

8.1x10-9

1.2x108

2.2x10-7

4.6x106

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.

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Cite this article: FindLaw.com - Code of Federal Regulations Title 49. Transportation § 49.173.434 Activity-mass relationships for uranium and natural thorium - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-49-transportation/cfr-sect-49-173-434/

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