Journal of Medical Physics
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Year : 1993  |  Volume : 18  |  Issue : 2  |  Page : 32-34

A Fast Response Wide Range Solid State Densitometer



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H.K Pendurkar


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Routine assessment of radiation doses for about 18,000 persons per month is still being carried out by the Radiation Protection Services Division through its Film Badge Service, in addition to 21,000 per month through TLD. This necessitated, earlier, the development of a semiautomatic Film Densitometer Reader which uses a densitometer having an expensive photomultiplier with associated high voltage supply and elaborate electronic circuitry covering a linear range of 0-4 optical density. This paper describes a linear densitometer developed using an ultrasensitive fast response silicon photodiode (which forms part of a solid state photo detector - amplifier combination) and a temperature compensated log ratio amplifier. The instrument is simple, cost-effective and reliable. It measures diffuse optical density of the monitor film in the range of 0 to 5 with a least measurable density of 0.01.


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