RE: Decay-In-Storage

["Perrero, Daren" <Perrero@idns.state.il.us>]

I would hypothesize that both elements are included to address the unknown
original activity nature of the issue as well as the unspecified "adequate
monitoring instrument and method" usually stipulated in a license.  Between
the two I would believe that there is a high reliability that nothing beyond
a "negligible" level is being disposed of without regard to its
radioactivity.

In these days of landfill and scrap yard monitor trips the appearance of
"uncontrolled radioactivity" in the public arena is a "perceived risk"
nightmare that happens all too regularly.

If you are willing to specify the manner and equipment used to perform the
survey to your regulatory agency so that they have a high degree of
confidence on the adequacy of the survey you may indeed be able to forego 10
half-lives in lieu of say 7 or 5 or maybe even less!


My opinion and only mine
Daren Perrero
dperrero@earthlink.net

-----Original Message-----
From: Sandy Perle [mailto:sandyfl@earthlink.net]
Sent: Wednesday, April 19, 2000 11:13 AM
To: Multiple recipients of list
Subject: Re: Decay-In-Storage


> If what Sandy say's is true than why are the regulatory folks 
> requiring 10 half-lives AND non-detectable?  It's a license 
> condition I must adhere to and document.

Bill,

Excellent question. Did an inspector ever answer that question?
It's a ridiculous license requirement, in that if there is NO 
detectable activity, using standard state of the art detection 
instrumentation, then what purpose does requiring x number of half-
lives serve? Makes no sense, and appears that whomever wrote the 
license section doesn't understand radioactive decay, measurements 
and detection.



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Sandy Perle					Tel:(714) 545-0100 / (800)
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Director, Technical				Extension 2306

ICN Worldwide Dosimetry Division		Fax:(714) 668-3149

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