[ RadSafe ] Gamma background radiation at ground level

McNaughton, Michael mcnaught at lanl.gov
Wed Feb 23 11:21:38 CST 2011

Filipe: background from terrestrial radiation is 5 to 15 microR/h, depending on the type of soil. Background from cosmic radiation is 5 to 10 microR/h depending on the altitude.  The supernova caused an increase of 0.5 microR/h at all locations so the increase was 2% to 5%. During a storm, gammas from Bi-214 and Pb-214 cause up to a factor of 2 increase, depending on the rate of the rain or snow fall.

Mike McNaughton

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Felipe Gaitan
Sent: Wednesday, February 23, 2011 9:59 AM
To: The International Radiation Protection (Health Physics) Mailing List
Subject: Re: [ RadSafe ] Gamma background radiation at ground level

Mike - What's the relative increase (%) in these two examples? Thanks, Felipe

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