[ RadSafe ] Disposal via Decay in Storage

[Baratta, Edmond J]

The NRC's 10CFR20, Appendix B allows for in Table 3 "releases to sewers"
"Monthly Average Concentration" is 6.0 E-04 µCi/mL.  The 'normal' dose for a
Stress Test is 60 µCi.  30 µCi is given at the time of the first part of the
test and 30 µCi six hours later.  The in growth from this amount is well
below these limits.  The above "Monthly Average Concentration" is for a
Licensee.  I don't whether this may apply to the Hospital. 

 

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: Stewart Smith [mailto:ssmith at envllc.com] 

Sent: Thursday, November 10, 2005 11:57 AM

To: Baratta, Edmond J; Cary Renquist; RADSAFE List

Subject: RE: [ RadSafe ] Disposal via Decay in Storage

 

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

 

_______________________________________________

You are currently subscribed to the RadSafe mailing list

 

Before posting a message to RadSafe be sure to have read and understood the
RadSafe rules. These can be found at:

http://radlab.nl/radsafe/radsaferules.html

 

For information on how to subscribe or unsubscribe and other settings visit:

http://radlab.nl/radsafe/

_______________________________________________

You are currently subscribed to the RadSafe mailing list

 

Before posting a message to RadSafe be sure to have read and understood the
RadSafe rules. These can be found at:
http://radlab.nl/radsafe/radsaferules.html

 

For information on how to subscribe or unsubscribe and other settings visit:
http://radlab.nl/radsafe/