[ RadSafe ] cesium 137 check source rate

Dixon, John E. (CDC/ONDIEH/NCEH) gyf7 at cdc.gov
Wed Aug 18 07:06:07 CDT 2010

I did a quick calculation and found the source should emit about 32
mr/hr (gamma) on its surface. This is a small isotropic source and the
dose rate will drop very quickly. If the source was shipped in the US by
US mail,  the package (not the source) contact dose rate should have
been less than 0.5 mr/hr.  Hope this helps.

John Dixon

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Harley Vance
Sent: Wednesday, August 18, 2010 4:22 AM
To: radsafe at health.phys.iit.edu
Subject: [ RadSafe ] cesium 137 check source rate

I just got a cesium 10 microcurie test source in the mail, and I haven't
gotten my geiger counter yet. 
My question is, what is the approximate rate of radiation at the surface
of the disc?

It is blue and I believe it is encased in some kind of epoxy.


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