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RE: Tl-201

To: "'Kurt R. Geber'" <Kurt.R.Geber@grc.nasa.gov>, radsafe-digest@list.vanderbilt.edu
Subject: RE: Tl-201
From: "Michel, Lee S" <michel@BNL.GOV>
Date: Wed, 31 Jul 2002 16:34:26 -0400
Reply-To: "Michel, Lee S" <michel@BNL.GOV>
Sender: owner-radsafe@list.vanderbilt.edu

If I remember correctly its not actually the Tl-201 that is giving you the problem its more likely one of the impurities which I believe is Tl 202 that is the trouble maker. Tl 202 has a 12.23 day half life. I operate a WBC system at brookhaven National Lab and I have been able to see people with Tl stress tests that still light my counter up at 6 weeks.

Lee Michel
Personnel Monitoring, Bldg 490
Brookhaven National Laboratory
Upton, NY 11973
(631)344-6306

-----Original Message-----
From: Kurt R. Geber [mailto:Kurt.R.Geber@grc.nasa.gov]
Sent: Thursday, August 01, 2002 4:25 PM
To: radsafe-digest@list.vanderbilt.edu
Subject: Tl-201

Does anybody have info on the biological half-live of Tl-201 used in stress tests. Does the inability to pass a portal monitor for 30 days seem excessive?

Kurt R. Geber
NASA Project Radiation Safety Officer

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