A radiation dosimeter utilizing the thermoluminescent properties of LiF has been developed. The instrument for measuring the light emitted by the LiF is simple, accurate and can be built for less than $500. The dosimeter has a useful range from 10 to 105 r with an accuracy of better than 5 per cent. The 35 mg sample of commercially available LiF is reusable and is used in loose, crystalline powder form, allowing considerable versatility. At 30 keV effective the response is only 25 per cent greater than at 1.2 MeV. The stored thermoluminescence decays less than 5 per cent per year and is unaffected by visible light, moisture or mechanical vibration. The dosimeter has a useful response to X-rays; gamma rays, thermal neutrons and electrons. It is presently being used at the University of Wisconsin both for routine clinical use and for research on thermoluminescent phenomena.
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