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MR. KERAN FP. O'BRIEN!
The Neutron
Instrumentation in use by our laboratory has,
as its purpoce, the measurement of stray rad{ation in occuplable and potentially occuplable
areas often in the presence of gamma radiation
of magnitude on an ionization basis and over a
wide range of neutron energies.
There is a further complication: in
that we are visitors and potential visitors to
200 accelerator sites and therefore our visit
nuet be brief,
The instrument muct be excentially
portable and the information ia derivable
from these instruments, It must be reletive=
ly clear and unambiguous.
We have mafe two approaches to the
solution of this problem.
The first is the
use of ionization chambex.; cha measurement
of ionization currents from chambers with
walls and filling of a suitable material and
the second is the use of instruments which are
essentially proportional eounters,
The fonization current produced in
en fonization chamber is eseentially propor
tional to the energy deposition rate in the
wall material at a depth equel to the wall
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