[Code of Federal Regulations] [Title 49, Volume 2] [Revised as of October 1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR173.434] [Page 615-616] TITLE 49--TRANSPORTATION CHAPTER I--RESEARCH AND SPECIAL PROGRAMS ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 173--SHIPPERS--GENERAL REQUIREMENTS FOR SHIPMENTS AND PACKAGINGS--Table of Contents Subpart I--Class 7 (Radioactive) Materials Sec. 173.434 Activity-mass relationships for uranium and natural thorium. The table of activity-mass relationships for uranium and natural thorium are as follows: [[Page 616]] ---------------------------------------------------------------------------------------------------------------- Specific activity Thorium and uranium enrichment1(Wt% 235 U present) --------------------------------------------------- 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. [Amdt. 173-244, 60 FR 50307, Sept. 28, 1995, as amended by 63 FR 52849, Oct. 1, 1998]