[ RadSafe ] cesium 137 check source rate

[Geo>K0FF]

Doug Aitken said: "I don't think there is any regulatory requirement for an 
exempt source to be
so marked And AFAIK, this is not a common practice."


Actually the wording on exempt quantity sealed sources from Spectrum 
Techniques contains the Trefoil, isotope, activity, date, half-life and the 
words
"USNRC and State License Exempt Quantity".

However I also have check discs on Ludlum meters that have only the Trefoil, 
isotope and activity in microCuries.

Disposal by a non licensee consists of removing or defacing the Trefoil then 
dropping into the ordinary waste stream. Unlicensed persons may not sell, 
give away or transfer unlicensed exempt quantities to another person, either 
licensed or unlicensed. The wording for this has been vague in the past but 
is now quite clear:

http://www.nrc.gov/reading-rm/doc-collections/cfr/part030/part030-0018.html
Section 30.18 reminds us that one cannot stack or combine exempt quantity 
sources in order to increase the radiation dose.



It is also quite clear that external markings on a shipment of exempt 
quantity check sources is not only NOT required, it is prohibited. Internal 
markings are required, see UN2910.

US NRC rules concerning ownership and use of  Byproduct Exempt Quantity 
sealed sources could not be simpler. Section 30.71 Schedule B lists the 
allowed quantities of all the listed isotopes.
http://www.nrc.gov/reading-rm/doc-collections/cfr/part030/part030-0071.html



George Dowell
GEOelectronics
New London Nucleonics Lab


----- Original Message ----- 
From: "Doug Aitken" <jdaitken at sugar-land.oilfield.slb.com>
To: "'The International Radiation Protection (Health Physics) Mailing List'" 
<radsafe at health.phys.iit.edu>
Cc: <harleyvance at ymail.com>
Sent: Thursday, August 19, 2010 1:35 PM
Subject: Re: [ RadSafe ] cesium 137 check source rate


>I don't think there is any regulatory requirement for an exempt source to 
>be
> so marked. And AFAIK, this is not a common practice.
> Also, the concept of "exempt" source is only applicable if the source has
> been issued by a license holder with a general distribution license to a
> non-license holder.
> If you hold a license, then the source is (AFAIK) no longer "exempt" in so
> far as you are required to safeguard it and may not dispose of it
> indiscriminately.
>
> At least, this is my understanding. Correct me if I am wrong......
> Regards
> Doug
>
> ___________________________________
> Doug Aitken
> QHSE Advisor
> D&M Operations Support
> jdaitken at sugar-land.oilfield.slb.com
> (alternate: doug.aitken at slb.com)
> Phone (cell): 713-562-8585
> Mail: c/o Therese Wigzell,
> Schlumberger,
> Drilling & Measurements HQ,
> 300 Schlumberger Drive, MD15,
> Sugar Land, Texas 77478
>
> -----Original Message-----
> From: radsafe-bounces at health.phys.iit.edu
> [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Clayton J Bradt
> Sent: Thursday, August 19, 2010 12:38 PM
> To: radsafe at health.phys.iit.edu
> Cc: harleyvance at ymail.com
> Subject: Re: [ RadSafe ] cesium 137 check source rate
>
> If it is an exempt source, which it certainly sounds like it is, the label
> will state this fact.  Furthermore, if Mr. Vance does not have a 
> radioactive
> materials license, there is no way he could have legally obtained this
> source unless it were exempt. Since exempt, 10 microcurie Cs-137 sources 
> are
> plentiful and readily obtainable by anyone, whether a licensee or not, the
> growth potential for a black market in non-exempt sources of this type 
> would
> seem to be rather limited.  It is therefore highly unlikely that the 
> source
> is not exempt.
>
> Clayton J. Bradt
> Principal Radiophysicist
> NYS Dept. of Health
> Biggs Laboratory, Room D486A
> Empire State Plaza
> Albany, NY 12201-0509
>
> 518-474-1993
>
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