beta shield sources

Warren Gallin wgallin at gpu.srv.ualberta.ca
Thu Nov 2 11:50:08 EST 1995


In Article <479g0d$sbr at news.jhu.edu>, ntheo at welchlink.welch.jhu.edu
(NICHOLAS THEODORAKIS ) wrote:
>In article <rjordan-2510951356100001 at linus.radonc.washington.edu>,
>Rob Jordan <rjordan at tezcat.com> wrote:
>>Can anyone email me some companies/catalog/etc. phone numbers that have
>>good selections of beta shielding devices.  I'm looking primarily for
>>boxes, containers, shields, etc. of various sizes, but every <insert
>>common lab supply catalog here> catalog that I've looked in has a page or
>>two at best.  I mean something like Acme Radiation Saftely Supply would be
>>perfect.
>>
>>Thanks-
>>Rob      rjordan at u.washington.edu
>
>Well, I don't have a recommendation (many lab supply vendors sell them),
>but I do have an observation that I hope will generate some discussion. 
>We have some plastic beta shields from Owl Scientific around the lab; 
>when we were doing some rad. surveys with a monitor that has probes for
>both beta- and gamma rays, we noticed that 32P kept behind the shield
>generated a lot of bremstrallung (spelling?) gamma radiation when it hit 
>the plastic (which did block the betas, BTW).  I almost think it would 
>safer not to use the shield.  Has anybody else noticed this with their 
>beta-shields?  Any comments?

You MUST put a sheet of lead outside a plastic beta shield to absorb the
Brehmstralung (sp?) radiation coming out of the plastic.  It is important
that the order be isotope-plastic-lead.

Warren Gallin,
Department of Biological Sciences, University of Alberta
wgallin at gpu.srv.ualberta.ca



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