Abstract
The Farmer dosemeter is extensively used in the measurement of beams of ionising radiation generated by a wide range of radiotherapy units. To measure the dose rate under steady state conditions an electronic timer has been developed. The components are easily available and assembled at a total cost of less than Pounds 38. The timer consists of a single large-scale integrated circuit fabricated by the CMOS process. This device (Intersil ICM 7250) is dedicated to stopwatch applications and incorporates oscillator circuitry, dividers, seven segment decoders and multiplexed output via 'on chip' digit drivers. The completed instrument provides a six digit 7.6 mm high LED display.
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