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RADIOACTIVITY MEASURING APPARATUS
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absorption alpha-particle amplitude anode apparatus atomic background counting beta beta-emitters beta-particles beta-rays calculate calibration cathode Chapter connected contamination correction factor counting rate counting system counting-rate meter counts/minute curve D.C. amplifier decay determine dose electro-mechanical register electrometer emission emits energy equation error gamma gamma-ray photons Geiger Geiger-Miiller counter geometrical efficiency geometry given gives graph grid half-life halogen hazard Inst ionization chamber laboratory measured method monitor necessary neon neon lamps number of counts obtained operation output particles plateau power unit probe unit produced proportional counter pulse quantity quartz-fibre quenching radiation radio isotopes radioactive contamination radioactive isotopes radioactive materials radioactive substances resolving scaler scaling unit scintillation counter secondary electrons self-absorption sensitive volume shown in Fig solid angle spurious counts standard deviation statistical accuracy suitable surface activity switch temperature thickness thin threshold voltage total number triggered triode tube tubular counter type of counter usually valve vibrating-reed X-rays