[ RadSafe ] Any suggestions for a nuclear medicine wipe counter?

garyi at trinityphysics.com garyi at trinityphysics.com
Mon May 21 08:59:52 CDT 2007

Hi John, 

Thanks for your suggestion. I've never used that counter, but it seems like it would be awfully 
close to or perhaps over the 1000 dpm/100 sq cm limit. You may have used it with no 
problems, but I played with the numbers listed on the web page you kindly sent me. At 6 
cpm/kdpm efficiency for Tc99m, and with the "Background Voltage" of up to 24 cpm, it can 
do better than 1000 dpm, but only if you count for the max count time of 20 minutes. And I 
wonder if "Background Voltage" refers to counts due to voltage/electronics and not external 
field. The downloadable information is rather vague. 

Since I'm trying to help someone who is using mostly I131, which probably counts less 
efficiently on this GM, I will probably keep looking. But like I said, I haven't used it before 
myself so please let me know if you have tried it and liked it. 

Thanks again, 

On 20 May 2007 at 17:39, John Jacobus wrote: 

Date sent:  Sun, 20 May 2007 17:39:42 -0700 (PDT) 
From:  John Jacobus <crispy_bird at yahoo.com> 
Subject:  Re: [ RadSafe ] Any suggestions for a nuclear medicine wipe 
To:  garyi at trinityphysics.com, RADSAFE <radsafe at radlab.nl> 

Try this. The Wipe Counter (Model 1051). It uses a GM 
detector system, and is easy to operate, i.e., 
pass/fail. I think that the NRC approved its use many 
years ago. 




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