Fwd: query

["Thatcher, Drew" <dht0303@hub.doh.wa.gov>]

                  ***** Original Message Follows *****

	Is there anything more recent and authoritative for summarizing
average annual radiation exposure in U.S. than NCRP-93 (published in
1987)? Are any of the figures given there changed by later info?

Bernard L. Cohen
Physics Dept.
University of Pittsburgh
Pittsburgh, PA 15260
Tel: (412)624-9245
Fax: (412)624-9163
e-mail: blc+@pitt.edu

I performed a literature search  about a year ago trying to locate more 
recent estimates that would take into account the radon gas conversions 
provided in ICRP 65.  I was unable to find any.  I've had on the back 
burner a simple update that uses the same equilibrium factor (0.4) but 
wanted to try and obtain a better picture of the average U.S. indoor 
radon concentration.  The NCRP uses a value of 1.0 pCi/L and I wanted to 
make sure this was still appropriate.  Is this along the lines of what 
you are looking for?

Sincerely,
Andrew H. Thatcher, MSHP, CHP
Washington Department of Health
360-236-3255 voice*
360-236-2255 fax*
dht0303@doh.wa.gov
*new number