Re: Photon response of pancake GM's

[Chris Alston <alstonc@odrge.odr.georgetown.edu>]

Assuming that the beam is perpendicular to the detector window, the response
of the tube (Type 8767), where the response at 662 keV is unity, is
essentially flat from above 1000 keV to ~170 keV. Then it turns sharply
upward, peaking at ~50 keV, whereupon it turns sharply downward, reaching
unity again somewhere between 5 and 10 keV. David Allard published a note on
this topic about ten years ago; it was presented at the HPS midyear meeting.

chris alston
alstonc@odrge.odr.georgetown.edu
My postings here are not in representation of my employer.

At 06:50  03/13/98 -0600, you wrote:
>I am looking for data regarding energy dependence in the photon response
>of typical pancake GM's, particularly in the 10-100 keV range relative
>to 662keV. If anyone has response data (beyond the line I have picked up
>from a couple of manufacturer's technical manuals about count rates per
>millirem per hour for 661.6 keV photons), I would greatly appreciate
>getting it.
>
>Thank you.
>
>Rick Edwards, Analyst
>The Boeing Company
>richard.w.edwards@boeing.com
>Phone:  425 383-8250
>FAX:	425 393-3060
>