#counter_tube__countertube  a measuring instrument for counting individual ionizing events
  supertype:  measuring_instrument__measuringinstrument__measuring_system__measuringsystem__measuring_device__measuringdevice  instrument that shows the extent or amount or quantity or degree of something
  subtype:  crystal_counter__crystalcounter  a counter tube in which an ionizing event increases conductivity
  subtype:  Geiger_counter__Geiger-Muller_counter  counter tube that detects ionizing radiations
  subtype:  proportional_counter_tube__proportional_counter  counter tube whose output pulse is proportional to number of ions produced
     subtype:  boron_counter_tube__boroncountertube  a proportional counter tube for counting neutrons
  subtype:  scintillation_counter__scintillationcounter  counter tube in which light flashes when exposed to ionizing radiation

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