Re: Underwater monitor

[alanjack@umich.edu]

From: Chris Davey <cdavey@med.phys.ualberta.ca>
Subject: Re: Underwater monitor
To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>

Radsafers,

Dale's silly question is not that silly.  Xetex recently sold me a
"waterproof" radiation detector (Model 302B) that dids exclude water and
thereby permit streaming.  This unit failed to remain waterproof even
after returning the unit several times.  I also pointed out the
streaming problem to Xetex and they corrected it for me by drilling
holes to let water into the pole.

-Alan Jackson
alanjack@umich.edu

On Tue, 2 Apr 1996, Dale E. Boyce wrote:

> Humor a University type who has a silly question.  When using an
extended
> probe to measure a high activity source shielded by water, is any
> consideration given in the instrument design to prevent radiation
> streaming through the pole?
> 
> Inquiring mind on caffiene wants to know.
> 
> Dale
> dale@radpro.uchicago.edu
> 

The pole comes with a number of holes, allowing water to enter it as it
is submerged, and drain out of it as it is removed

Chris Davey, RSO    Cross Cancer Institute    Edmonton, Alberta

(no, we don't use them here....  I used to be involved with IAEA 
techniques to verify used fuel at reactor sites)