[ RadSafe ] Attn: x-ray hot shots

[Geo>K0FF]

Is the GM a thin window? What is the fill gas and pressure? At those 
energies, the main obstacle is the entrance window material.
Some tubes are made especially for the task i.e. beryllium windowed high 
pressure Krypton or Argon fill- but some are operated in the proportional 
region.

Possibly use Fe-55 check source to calibrate the system??

Are there charged particles involved at all?


George Dowell
New London Nucleonics Lab.
----- Original Message ----- 
From: "Joel Cehn" <cehn at aol.com>
To: <radsafe at radlab.nl>
Sent: Tuesday, August 19, 2008 3:31 PM
Subject: [ RadSafe ] Attn: x-ray hot shots


> I'm using an ion chamber and GM to detect soft x-rays (<10keV).? Specs on 
> the ion chamber say exposure rate response at those energies is 50% or 
> less (indicated/actual).? Those on the GM say 200% (indicated/actual). The 
> GM over-responds by 150%, which is close enough to the spec?for this work. 
> Surprisingly, the ion chamber (Bicron RSO-5)?appears to be?spot on! No 
> correction needed.? Anyone play around with soft x-rays, and can tell me 
> if I'm off track?? (Please, no lectures on using a GM to measure exposure 
> rate--I'm not using it for that.)
>
>
> Joel I. Cehn, CHP
> Oakland, California
> joelc at alum.wpi.edu
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