A portable apparatus for recording the rate of clearance of radioactive sodium from human calf muscle

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Abstract
The apparatus consists of a halogen quenched Geiger-Muller counter which straps over the muscle to be tested and a light pack which contains, batteries, the high tension generator for the counter, an electronic circuit in which alternate pulses from the counter are used to trigger a pulse generator, a wire recorder and a monitoring ratemeter. The record obtained on the wire recorder is played back, and after amplification the pulses are fed into the monitoring ratemeter, the output from which is amplified and used to drive a recording milliammeter.