106
instrument.
It uses a nuclear inter-action
to favor neutron pulses in a cirsuit to
accept only those pulees greater than a
precept pesk voltage fo discriminate
neutron produced pulses from pulses pro-
duced from gamma radiation,
The Hornyak and the Hurst
Proportional Counter are both survey type
Anstrumente,
The former uces the light
pulses produced in @ zino sulphide lucite
sointillator and the latter uses -=
well,
in the first -éase they are produced either
by recoiled protone with the lucite or the
reacbion protons from the sulphur reaction
and the latter uses the recoil from the
ethylene filling.
Eince’ both of these = since the
pulse heights in both of these cases depend
con the kinetic energy of the instant neufron,
there are fluxes with sufficiently low ener~
gies that will not be registered by the counte
ing instruments.
|
In other words there are low energy
cutorfs below which these inetruments will
not work.