RE: check sources

["Heinmiller, Bruce" <heinmillerb@aecl.ca>]

But be careful about interpreting the count rate, as this will be a function
of the time since chemical separation of the thorium, because of (among
other things) the grow-in of the relatively long-lived radium-228.

Bruce Heinmiller
heinmillerb@aecl.ca

> ----------
> From: 	Ninni Jacob[SMTP:Ninni_Jacob@brown.edu]
> Reply To: 	radsafe@romulus.ehs.uiuc.edu
> Sent: 	Friday, September 18, 1998 2:10 PM
> To: 	Multiple recipients of list
> Subject: 	check sources
> 
> Coleman lantern mantles (thorium impregnated) taped to the side of the
> instrument serve as excellent check sources. The count rate from them can
> be determined at calibration. One does not have to worry about licensing
> problems and losing licensed sources. They do  not have the potential for
> contamination either like the uranyl acetate powder might have. 
> 
> The only problem is that it is hard to find the blue "radioactive" ones
> anymore. The ones that are readily available now are the "gold" ones that
> are non radioactive.
> 
> If any of you are aware of where to obtain these (departmnent store names)
> I would appreciate hearing from you,  since I need to purchase some.
> 
> Thanks
> 
> Ninni
> _________________________________________________________________________
> Ninni Jacob
> Radiation and Biological Safety Officer
> Office of Risk Management
> Brown University - Box 1914
> 164 Angell Street
> Providence, RI 02912
> 
> Tel:401 863 1738 (direct)
>     401 863 3353 (main)
> Fax:401 863 7676
> 
> email: Ninni_Jacob@brown.edu
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