A proportional detector with pulse height discrimination circuitry is being used in a constant field of neutron and gamma radiation to provide source range neutron count rate indication.
Assume that the pulse height discrimination setpoint does not change.
If the detector voltage is increased but maintained within the proportional region, count rate indication will increase because…
A. a single neutron- or gamma-induced ionizing event will result in multiple pulses inside the detector.
B. the ratio of the number of neutron-induced pulses to gamma-induced pulses inside the detector will increase.
C. the positive space charge effect will increase and promote the collection of both gamma- and neutron-induced pulses.
D. all detector pulses will increase in amplitude and previously uncounted gamma pulses will be added to the total count rate.
Show Answer
Answer: D
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