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

[edmond0033 at comcast.net]

I believe the reason for the Tc-99m is that it gives a better image, (since they use a much higher dose),  is more easily available and has a shorter half-life.  My last two stress tests used it.  My original tests used the Tl-201.  The impurties last longer than the Tl-201. 



Ed Baratta 



edmond0033 at comcast.net 
----- Original Message ----- 
From: neildm at id.doe.gov 
To: estroud at smtpgate.dphe.state.co.us, radsafe at radlab.nl, al at solidsurfacealliance.org 
Sent: Wednesday, January 28, 2009 10:36:50 AM GMT -05:00 US/Canada Eastern 
Subject: RE: [ RadSafe ] Re: radsafe Digest, Vol 181, Issue 3 

All of the tests I have been aware of (including mine) have used 
thallium. 

Of course, the difference in half-life may have something to do with 
that ... :-) 

Dave Neil 

-----Original Message----- 
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On 
Behalf Of Ed Stroud 
Sent: Monday, January 26, 2009 7:09 AM 
To: radsafe at radlab.nl; al at solidsurfacealliance.org 
Subject: [ RadSafe ] Re: radsafe Digest, Vol 181, Issue 3 

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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