RE: Source of regs/policy on decay in storage

["Vernig, Peter G." <Peter.Vernig@med.va.gov>]

Dave Derenzo wrote:

"As you might expect, ours was 
originally  65 days when we had our NRC license (before Illinois became an 
agreement state), but since then we have increased it to 90 days so that we 
can categorize S-35 as short-lived.  I have seen others establish it at 120 
days.  Holding waste for a minimum of 900 (2.5 y) or 1200 days (3.3 y) is a 
LONG time for a medical or research facility, but if you have the storage 
space, it is worth it."

The new part 35, due for final commission review May 31, codifies 120 days
as the maximum DIS half life and removes the ten half life rule.  DIS
material must still be surveyed and found to be indistinguishable from
background.

I agree with Dave, sealed sources can not be discarded after they decay to
exempt quantities.

Regards,

Peter G. Vernig
VA Medical Center Denver
peter.vernig@med.va.gov

-----Original Message-----
From: Dave Derenzo [mailto:dave@uic.edu]
Sent: Wednesday, April 19, 2000 7:13 AM
To: Multiple recipients of list
Subject: Re: Source of regs/policy on decay in storage


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