United States Nuclear Regulatory Commission - Protecting People and the Environment

U.S. Nuclear Regulatory Commission

Allowable Contamination Limit for Thorium-natural

HPPOS-149 PDR-9111220081

Title: 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

Page Last Reviewed/Updated Thursday, March 29, 2012