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Gamma Spec to Determine U and Th Concentrations

Hello,



In a previous query, I asked about the abundance of the 727 KeV line in 

Bi-212.  Thanks to several responses, I was informed that the abundance of 

11.8% shown in ICRP 38 is incorrect.  The "accepted" value, based on the 

NuDat database at http://www.nndc.bnl.gov/  , is 6.58%.   Other lines in 

ICRP 38 for Bi-212 are also incorrect.



I have a follow-up query.  Given that various gamma lines are measured with 

varying precision in gamma spec, and knowing of possible interferences, 

which two gamma lines (one from U-238 series and one from the Th-232 

series) would be the best to determine the U and Th concentrations in a 

sample.  (Radioactive equilibrium  may be assumed.)



In the U-238 series, is it Pb-214 or Bi-214?



In the Th-232 series, is it Ac-228, Pb-212, Bi-212, or Tl-208.



Is there a "standard" reference in gamma spec that indicates which are the 

best lines to use?



Again, please feel free to respond to me directly since I get Radsafe via 

Digest mode i.e. only once per day.



Thanks.



Leo M. Lowe, Ph.D., P.Phys.

Principal, Senior Health and

Environmental Physicist



SENES Consultants Limited

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Richmond Hill, Ontario

Canada L4B 3N4

Tel:	(905) 764-9380

Fax:	(905) 764-9386

llowe@senes.ca

www.senes.ca



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