AW: [ RadSafe ] DPM from 27 pCi Tc-99

[Franz Schönhofer]

Wes,

I did not send an answer to this question, because I thought it must be a
hoax. I thought that somebody who tries to sell on RADSAFE a whole bunch of
used instruments, which he claims to have used himself should be able to
convert pCi to dpm (or dps aka Bq), and should know that this is
irrespectable of the "substrate" or whether it is electroplated or not.
Assuming that he may have wanted to know cpm (and not dpm) he should know,
that this depends on the type of instrument used, the energy sensitivity,
the area of the detector, the distance to the source etc. etc. 

Earlier contributions of Geo>KOFF to RADSAFE made me shake my head, but
because of my experience with being flamed on RADSAFE when I previously
questioned someones qualifications I did not comment. 

Is this another troll on the list?

Best regards,

Franz

Franz Schoenhofer, PhD
MinRat i.R.
Habicherg. 31/7
A-1160 Wien/Vienna
AUSTRIA


-----Ursprüngliche Nachricht-----
Von: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] Im Auftrag
von Wes
Gesendet: Donnerstag, 13. Dezember 2007 02:05
An: 'Geo>K0FF'; radsafe at radlab.nl
Betreff: RE: [ RadSafe ] DPM from 27 pCi Tc-99

George,
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
KF2LG
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
NLNL
New London Nucleonics Lab 


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