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Re: Tl-201



Dont confuse the general public with the facts.

"Baratta, Edmond J" wrote:

The US Pharmacopoeia lists the impurities maximum amount of impurities allowed for Thallium-201 to be no greater than 5%.  If the injection is 2-4 millicuries, then the impurities could be up to 0.2 millicuries.  Some of the impurities could 'stay around' for over 30 days.  It depends upon the sensitivity of the portal monitor whether they will pass or not.  Allowance should be made for this. 

Edmond J. Baratta

Radiation Safety Officer

Tel. No. 781-729-5700, ext 728

FAX: 781-729-3593

-----Original Message-----
From: Kurt R. Geber [mailto:Kurt.R.Geber@grc.nasa.gov]
Sent:
Thursday, August 01, 20024:25 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