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Bristol Instruments, Inc. - 872 Series High-Res 4/24 LB
Photonics Dictionary

radioactivity detector

An instrument used to detect radioactive materials: alpha particles or helium nuclei; beta particles or free electrons; and gamma rays, which are x-rays of very short wavelength. They may be detected by their chemical effects, by ionization produced in gases at low pressure or by tracks formed in a cloud chamber.
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