Default Surface Contamination Criteria for Th-nat

["Dan Hoffman" <dhoffman@pangea-group.com>]

Has anyone developed a surface release criterion for Th-232 + daughter products using D&D or ResRad to comply with the 25 mrem/yr NRC release limit?  I noted that NUREG 1757 Appendix B has a default screening limit for "Th-232 + C" in soils of 1.1 pCi/g but no surface criteria is published.  



I am curious if the numbers would be close to the Reg Guide 1.86 criteria or not.



Regards,



Dan



Daniel E. Hoffman, CHP,CIH,CSP

Vice President EH&S Services

Pangea Group

743 Spirit 40 Park Dr., Suite 232

Chesterfield, MO 63005

Office 636-519-4877

Mobile 314-707-5606



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