49 CFR 173.434 - Activity-mass relationships for uranium and natural thorium.

§ 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 × 10−8 5.4 × 10 7 5.0 × 10−7 2.0 × 10 6
0.72 (natural) 2.6 × 10−8 3.8 × 10 7 7.1 × 10−7 1.4 × 10 6
1.0 2.8 × 10−8 3.6 × 10 7 7.6 × 10−7 1.3 × 10 6
1.5 3.7 × 10−8 2.7 × 10 7 1.0 × 10−6 1.0 × 10 6
5.0 1.0 × 10−7 1.0 × 10 7 2.7 × 10−6 3.7 × 10 5
10.0 1.8 × 10−7 5.6 × 10 6 4.8 × 10−6 2.1 × 10 5
20.0 3.7 × 10−7 2.7 × 10 6 1.0 × 10−5 1.0 × 10 5
35.0 7.4 × 10−7 1.4 × 10 6 2.0 × 10−5 5.0 × 10 4
50.0 9.3 × 10−7 1.1 × 10 6 2.5 × 10−5 4.0 × 10 4
90.0 2.1 × 10−6 4.7 × 10 5 5.8 × 10−5 1.7 × 10 4
93.0 2.6 × 10−6 3.9 × 10 5 7.0 × 10−5 1.4 × 10 4
95.0 3.4 × 10−6 3.0 × 10 5 9.1 × 10−5 1.1 × 10 4
Natural thorium 8.1 × 10−9 1.2 × 10 8 2.2 × 10−7 4.6 × 10 6

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.

[Amdt. 173-244, 60 FR 50307, Sept. 28, 1995, as amended by 63 FR 52849, Oct. 1, 1998]

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United States Code

Title 49 published on 09-May-2017 04:41

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 49 CFR Part 173 after this date.

  • 2017-03-30; vol. 82 # 60 - Thursday, March 30, 2017
    1. 82 FR 15796 - Hazardous Materials: Harmonization With International Standards (RRR)
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, Pipeline and Hazardous Materials Safety Administration
      Final rule.
      Effective date: This rule is effective March 30, 2017, except for instruction 22, which is effective January 2, 2019. Voluntary compliance date: January 1, 2017. Delayed compliance date: Unless otherwise specified, compliance with the amendments adopted in this final rule is required beginning January 1, 2018. Incorporation by reference date: The incorporation by reference of certain publications listed in this rule is approved by the Director of the Federal Register as of March 30, 2017.
      49 CFR Parts 107, 171, 172, 173, 175, 176, 178, and 180

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