[ RadSafe ] Re: radsafe Digest, Vol 181, Issue 3

[Ed Stroud]

Most cardiac stress tests use Tc-99m with a half-life of 6 hours. However, some cardiologists prefer to use a combination of Tc-99m and Tl-201. Thallium has a half-life of 73 hours.
-Ed Stroud

>>> <al at solidsurfacealliance.org> 1/23/2009 5:30 PM >>>


Hi All,
 
I friend of mine had a stress test on Tuesday, heart patient, had some stents installed a few weeks back.   About a foot away from his chest, my PM 1703 Gamma Scintillator was reading over 2,500 uR/hr.   This was Saturday night, at least four full days after the procedure.
 
Is this unusual?  I thought most of those medical isotopes had very short half lives.
 
Thanks,
 
Al
 
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