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  1. Oxford American Dictionary

    proportional counter

    • IPA[pərˌpôrSHnəl ˈkoun(t)ər]
    • n.
      an ionization chamber in which the operating voltage is large enough to produce amplification but not so large that the output pulse ceases to be proportional to the initial ionization.

    • noun: proportional counter, plural noun: proportional counters