[ RadSafe ] surface emission rate,surface DPM from 27 pCi Tc-99

Geo>K0FF GEOelectronics at netscape.com
Fri Dec 14 09:39:14 CST 2007

In case there is some confusion or a problem in translation, the information 
requested is the 2 pi beta emission rate from the source delineated below.

Another way of stating it is: the total number of beta particles coming from 
the front working surface of the disc.

Forget about self absorption, counting error, confidence level, and 
systematic error.

This is not a trick question. To determine the beta efficiency of a probe, 
one needs to know how many particles are leaving the test disc.

Reply if you care to, to

George Dowell at

GEOelectronics at netscape.com

The calculations will be posted here after a short time.

George Dowell
New London Nucleonics Lab

----- Original Message ----- 
From: "Geo>K0FF" <GEOelectronics at netscape.com>
To: <radsafe at radlab.nl>
Sent: Tuesday, December 11, 2007 7:45 PM
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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