A gas-filled radiation detector operating in the proportional region is exposed to a constant gamma radiation field.
If the applied voltage is decreased but maintained within the proportional region, the rate of ion collection will…
A. stay approximately the same, because all primary ions are collected as long as detector voltage remains in the proportional region.
B. stay approximately the same, because the detector is still operating at saturated conditions.
C. decrease, because a decreased space charge around the positive electrode reduces gas amplification.
D. decrease, because fewer secondary ionizations are occurring in the detector.
Show Answer
Answer: D
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