A proportional counter is a type of gas-filled radiation detector used to measure ionizing radiation. It operates by counting the number of ion pairs produced when radiation interacts with the gas inside the counter. Proportional counters are particularly effective for detecting alpha, beta, and gamma radiation.
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A gas-filled particle detector using electron avalanche multiplication. Within its proportional operating range, the collected electric charge tracks the initial ionization, allowing more than a yes-or-no count.