[ RadSafe ] Disposal via Decay in Storage

[Baratta, Edmond J]

I should have said millicuries.  The Tc-99m decays to Tc-99 which decays by
beta and has a much longer half-life.  If you calculate the amount produced
it is in the picocuries range.  The formula can be found in "Decay and
Growth Tables for Naturally Occurring Radioactive Series" H. W. Kirby,
ANALYTICAL CHEMISTRY, Volume 26, No. 6 pp 1063(1954) and he referenced it
from Bateman, H., Proc. Cambridge Phil. Soc., 15, 432 (1910) and Rutherford,
E. et al, "Radiations from Radioactive Substances" p. 13, London, Cambridge
University Press, (1951)

 

Edmond J. Baratta

Radiation Safety Officer

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

FAX: 781-729-3593

 

The above are my thoughts and not that of my Agency.

 

 

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On Behalf
Of Khalid Aleissa
Sent: Thursday, November 10, 2005 5:47 PM
To: Baratta, Edmond J; 'Cary Renquist'; RADSAFE List
Subject: Re: [ RadSafe ] Disposal via Decay in Storage

 

I believe that the question still is not answered ... how we get rid of 

Tc-99m ...

 

Khalid

----- Original Message ----- 

From: "Baratta, Edmond J" <EBARATTA at ORA.FDA.GOV>

To: "'Cary Renquist'" <cary_rdsfe at pacbell.net>; "RADSAFE List" 

<radsafe at radlab.nl>

Sent: Thursday, November 10, 2005 6:43 PM

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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