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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
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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? NASA Project Radiation Safety Officer |