[ RadSafe ] DPM from 27 pCi Tc-99

Wes WesVanPelt at verizon.net
Wed Dec 12 19:05:03 CST 2007

The answer is 27 x 2.22 = 60 DPM, exactly.  The rate of beta emission into
the air from the surface is another number, smaller than 60. The count rate
(CPM) of some instrument placed on the surface is even less. 

Best regards,  Wes
Wesley R. Van Pelt, PhD, CIH, CHP 
Wesley R. Van Pelt Associates, Inc.  

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On Behalf
Of Geo>K0FF
Sent: Tuesday, December 11, 2007 8:46 PM
To: radsafe at radlab.nl
Subject: [ RadSafe ] DPM from 27 pCi Tc-99

What is the surface DPM of a 27 pCi Tc-99 electroplated disc source? The 
substrate is stainless steel. (by calculation only please)

George Dowell
New London Nucleonics Lab 

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