Gas Proportional Counters

[radgovwa@sage.wt.com.au]

Hi Radsafers

We were having a discussion at morning tea/coffee about the efficiency of gas proportional 
detectors in 2 pi geometry. I mantain that the max efficiency in 2 pi 
should be between 40% to 45% and can't go above 50%  for 
alpha detection. For beta detection the figure should be between 30% 
to 40%. The sources we use for calibration are Am-214 and Sr-90.

What are your thoughts??

Rex Breheny
radgovwa@saga.wt.com.au