RE: RE: Dose Rates vs. Altitude

["Feldman, Gerald" <gfeldman@msx.ndc.mc.uci.edu>]

I suspect you mean six atmospheres of pressure, not 600 psi.  At 600 psi,
the walls of the chamber would have to be so thick as to render the
instrument useless at low to moderate energies.  (Even at six atmospheres,
the lower energy spec on one commercial instrument is 60 KeV.) 

Gerald Feldman, M.S.
Radiation Safety Officer
University of California, Irvine Medical Center
Orange, California
gfeldman@uci.edu 
 

-----Original Message-----
From: Rodney Bauman [mailto:rodney_bauman@wssrap-host.wssrap.com]
Sent: Thursday, December 02, 1999 8:50 AM
To: Multiple recipients of list
Subject: Re:RE: Dose Rates vs. Altitude


Pressurized ion chambers are pressurized (usually to 600 psi) in order to
increase the instrument's sensitivity, not to allow use at varying
atmospheric
pressures.  A standard "non-pressurized" 350 cc ion chamber cannot
accurately
measure below 0.2 mrad/hr. 

Rodney Bauman, RRPT, CHP
rodney_bauman@wssrap-host.wssrap.com

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