49 C.F.R. § 173.434 Activity-mass relationships for uranium and natural thorium.
Title 49 - Transportation
The table of activity-mass relationships for uranium and natural thorium are as follows: [Amdt. 173–244, 60 FR 50307, Sept. 28, 1995, as amended by 63 FR 52849, Oct. 1, 1998]
Title 49: Transportation
PART 173—SHIPPERS—GENERAL REQUIREMENTS FOR SHIPMENTS AND PACKAGINGS
Subpart I—Class 7 (Radioactive) Materials
§ 173.434 Activity-mass relationships for uranium and natural thorium.
---------------------------------------------------------------------------------------------------------------- Specific activity Thorium and uranium enrichment \1\(Wt% \235\ U present) --------------------------------------------------- TBq/gram Grams/Tbq Ci/gram Grams/Ci----------------------------------------------------------------------------------------------------------------0.45 (depleted)............................................. 1.9x10-8 5.4x10\7\ 5.0x10-7 2.0x10\6\0.72 (natural).............................................. 2.6x10-8 3.8x10\7\ 7.1x10-7 1.4x10\6\1.0......................................................... 2.8x10-8 3.6x10\7\ 7.6x10-7 1.3x10\6\1.5......................................................... 3.7x10-8 2.7x10\7\ 1.0x10-6 1.0x10\6\5.0......................................................... 1.0x10-7 1.0x10\7\ 2.7x10-6 3.7x10\5\10.0........................................................ 1.8x10-7 5.6x10\6\ 4.8x10-6 2.1x10\5\20.0........................................................ 3.7x10-7 2.7x10\6\ 1.0x10-5 1.0x10\5\35.0........................................................ 7.4x10-7 1.4x10\6\ 2.0x10-5 5.0x10\4\50.0........................................................ 9.3x10-7 1.1x10\6\ 2.5x10-5 4.0x10\4\90.0........................................................ 2.1x10-6 4.7x10\5\ 5.8x10-5 1.7x10\4\93.0........................................................ 2.6x10-6 3.9x10\5\ 7.0x10-5 1.4x10\4\95.0........................................................ 3.4x10-6 3.0x10\5\ 9.1x10-5 1.1x10\4\Natural thorium............................................. 8.1x10-9 1.2x10\8\ 2.2x10-7 4.6x10\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.
