title: The operation of proportional counters at low pressures for microdosimetry.
mesh_terms: D004566:Electrodes; D004581:Electronics; D005740:Gases; D007477:Ions; D008433:Mathematics; D008722:Methods; D011312:Pressure; D011834:Radiation Monitoring / Q000295:instrumentation; D011874:Radiometry
chemical_list: D005740:Gases; D007477:Ions