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Re: accelerator monitoring



If you use an ion chamber, even in an integrating mode, you still have to be 
careful that you don't have recombination, i.e., the ion cloud in the chamber 
is so dense that a substantial proportion of the ions recombine before they 
reach the electrode.  You might try test runs with TLDs and ion chamber 
measurements.  If there is recombination, you might be able to develop a 
correction factor for the ion chamber. 
Bill Lipton 
The opinions expressed are strictly mine. 
Here's to a risk free world, and other fantasies. 





Whoops.
Missed the 'every few seconds'.
Still can do it with an ion chamber by you will
need smart, i.e., digital, logic to display
meaningful 'rate' results.

Alternatively you could simply display cumulative
data and use a total dose alarm.

The old Berkley BeVatron used an activation foil
viewed by a GM detector as a way of smoothing out
infrequent pulses.  Wade Patterson watches this list
and can add more.  For an electron acc at this energy
a similar technique might be used in areas where high
energy radiation must be monitored.

A little risk adds spice to life.
Lester.Slaback@NIST.gov