A directional scintillation counter for clinical measurements

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Abstract
The instrument incorporates a liquid nitrogen cooled photo-multiplier and a thallium-activated KI crystal separated from the photo-multiplier by a Perspex light guide. Details are given of the absolute counting rates obtainable with 5 radioisotopes commonly used in clinical work and also of the directional properties of the instrument. The counting efficiency for the gamma radiation from I131, expressed as counts/quantum incident on the crystal, is 31.6%.