Re: 137Cs check sources

["Warren Church" <Warren_Church@uml.edu>]

If these are GM survey meters.  You can go to the lowest range and use
background radiation for your check source.  For critical situations such as
checking before entering our gamma cave (potentially a "very high radiation
area" we have either mounted a check source on the wall or permanently mounted
a Beta check source on the Beta window and lived with a slightly higher
background reading.
Warren Church, UML RSO
warren_church@uml.edu

mdater@nexstar.com wrote:

> 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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