RE: Background radiation levels in U.S.

["Jim Otton" <jkotton@usgs.gov>]

Alan and Radsafers,

Maps of terrestrial gamma radioactivity for the U.S. can be found at

http://energy.cr.usgs.gov/radon/DDS-9.html

>From this page the reader can go to four pages as follows:

    * Download a map of estimated potassium concentrations for the

conterminous U.S. (68 k)



    * Download a map of equivalent uranium-238 concentrations for the

conterminous U.S. (76 k)



    * Download a map of equivalent thorium-232 concentrations for the

conterminous U.S. (71 k)



    * Download a map of estimated total gamma exposure for the conterminous

U.S. (78 k)



These maps were derived from airborne radiometric surveys conducted by DOE

in the late 1970s as part of the National Uranium Resources Evaluation

Program by Joe Duval of the USGS.

Such maps should not be used to estimate the terrestrial gamma activity or

K, U or Th content of surface soils and rocks of a small area (like a

residential or a commercial property) but can be used to describe the

background variation of larger areas like counties.



Jim Otton

U.S. Geological Survey

Energy Program





-----Original Message-----

From: owner-radsafe@list.vanderbilt.edu

[mailto:owner-radsafe@list.vanderbilt.edu]On Behalf Of

APasConslt@AOL.COM

Sent: Wednesday, August 25, 2004 12:06 PM

To: radsafe@list.vanderbilt.edu

Subject: Background radiation levels





Does anyone on the list know where to find a map of the U.S. with

information

on background radiation levels?



Alan Pasternak

APasConslt@aol.com



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