[ RadSafe ] Disposal via Decay in Storage

[Stewart Smith]

As the decay daughter of Tc-99m is Tc-99 [½t-213,000 yrs] as pointed out by Dr. Johnson, and an isotope of specific interest in 10CFR61.55, care should be given to release of the material as "held for decay".

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On Behalf Of Baratta, Edmond J
Sent: Thursday, November 10, 2005 10:44 AM
To: 'Cary Renquist'; RADSAFE List
Subject: RE: [ RadSafe ] Disposal via Decay in Storage


Technetium-99m has a six (6) hour half-life.  After sixty (60) hours it should have decayed away.  This is radiopharmaceutical that is commonly used.  That's why it is popular, otherwise we would have people walking around who are 'hot'.

Edmond J. Baratta
Radiation Safety Officer
Tel. No. 781-729-5700, ext 728
FAX: 781-729-3593

This is my opinion and not those of my Agency. 


-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On Behalf Of Cary Renquist
Sent: Wednesday, November 09, 2005 6:02 PM
To: RADSAFE List
Subject: [ RadSafe ] Disposal via Decay in Storage

Quick question:

Is Tc-99m a candidate for disposal via
decay-in-storage?

If so, what would be a acceptable method for monitoring the decayed material prior to release?

Thanks for any info.
Cary

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