[ RadSafe ] Na 22 PET question

[Gary Isenhower]

Man, do I feel stupid.  Yes, of course you're right.  In our office we 
have a NaI scaler with no energy discrimination, so I guess I'm just 
used to thinking that way.

Thanks,
Gary Isenhower, M.S.
713.690.3020



Daniel F. Kane wrote:

> If you nominally set the counting window to say 450 to 550 keV, the 
> 1.2 MeV photon will not be counted except to the minimal extent is 
> scatters down into the window.
>
> Be sure to apply the % abundance of the 511 keV photons to determine 
> the efficiency. I do not recall what the actual abundance is at the 
> moment.
>
> Dan Kane
> ----- Original Message ----- From: "Gary Isenhower" 
> <garyi at trinityphysics.com>
> To: "radsafe" <radsafe at radlab.nl>
> Sent: Thursday, April 27, 2006 10:46 AM
> Subject: [ RadSafe ] Na 22 PET question
>
>
>> How can Na 22 be used to find efficiency for wipe counters at PET 
>> facilities, if the Na 22 has that extra 1.2 Mev photon  with every 
>> decay? Doesn't that mess up the efficiency or do the counters correct 
>> for that somehow?
>>
>> Thanks for any help,
>> Gary Isenhower, M.S.
>> 713.690.3020
>>
>>
>>
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