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HPPOS-149 PDR-9111220081

Allowable Contamination Limit for Thorium-natural

See the memorandum written for files by R. G. Page and dated August 27, 1982. This memo concerned a telephone conversation with Mark Whittaker of Chem. Nuclear, Inc. The memorandum states that the allowable contamination limit in the Guidelines for Decontamination of Facilities for Unrestricted Use or Termination of Licenses for Byproduct, Source or Special Nuclear Material for “thorium-nat” is the total radioactivity present from thorium radionuclides plus all daughters.

Regulatory references: 10 CFR 30.3, 10 CFR 40.3, 10 CFR 70.3

Subject codes: 3.6, 5.0, 7.6, 12.4

Applicability: Source Material