Re: High Range Dose Rate Monitors

[Ted de Castro <tdc@xrayted.com>]

I think you are asking way too much of any one detector!  I can't think
of anything with that dynamic range!

So I'd ask WHY??  Why do you want the ONE detector to "trip at a low
level" and "measure" at the high level?

It seems to me that a low level detector that tops out would be just
fine for the interlock trip (EASILY done with a GM) and a SEPARATE
detector for the high range measurement - most likely and ion chamber.

Separate ion chambers would do too - but ion chambers can be rather
"finicky" sometimes - or at least their electrometers can for the low
range ones.

Lorna Bullerwell wrote:
> 
> Hi all,
> 
> We are looking to replace some monitors to measure dose rate for a very
> high radiation area (>500 krad/h) which also need to function properly at
> near background levels.  They need to have the capability of tripping at
> low level radiation fields, and not get max out in the higher fields.  The
> monitor would be tied into a door-interlocking system, such that it would
> have to send a signal to the interlock that no high level radiation is
> present prior to allowing the door to be opened.  Do any of you have any
> recommendations for vendors, etc.?  Please respond to me directly, unless
> you feel this would be of interest to the whole list.  Thanks!
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> Any statement above is 100% my responsibility.
> Don't blame Cornell!
> ***********************************************************************
> Lorna Hubble (Bullerwell)               Phone:  (607) 255-8816
> Radiological Safety Specialist  Fax:  (607) 255-8267
> Cornell University                      mailto:ljb1@cornell.edu
> Department of Environmental Health and Safety
> Laboratory and Radiation Safety Section
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