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RE: 137Cs check sources
Mount a check source in a shielded holder on a wall or benchtop. Having it
mounted on a meter is not a god idea for several reasons - ALARA, potential
leakage and subsequent area contamination, etc. Since you already have a
number of complaints, do it soon to keep aggravation minimized.
Jim Bult, RRPT
NASA Marshall Space Flight Center RSO
> ----------
> From: mdater@nexstar.com[SMTP:mdater@nexstar.com]
> Reply To: radsafe@romulus.ehs.uiuc.edu
> Sent: Thursday, September 17, 1998 11:46 AM
> To: Multiple recipients of list
> Subject: 137Cs check sources
>
> I have been installing the 1 uCi 137Cs check sources to our survey meters.
> I have had an uproar over the fact that these sources are emmiting an
> surveyable reading even 12 inches away from the checksource
> I measured 65000cpm (using a ludlum 44-2 detector) on surface of one of
> these checksources.
> My questions:
> Does anyone have data on the exposure rate of these sources to an
> individual that is in proximity of the source for 8 hr?
> Is there a better way to check meters for functionality, rather than have
> a
> check source attached?
> How have others tackled this protest (that the check source is irradiating
> the individuals, hands, arms, benchpartner, etc.)
> When was this regulation(and can you reference this regulation to me) put
> in place that an individual has to be exposed to radiation for the reason
> that a survey meter can be checked against radiation?
> Mark Dater
> NeXstar Pharmaceuticals, Inc.
> 2860 Wilderness Place
> Boulder, CO. 80301
> Work phone: (303) 546-7703
> Fax: (303) 444-0672
> E-mail mdater@Nexstar.com
> These are my comments and questions and not those of my employer.
>
>
>
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information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html