DOSIMETER USING MAGNESIUM OXIDE

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PROBLEM TO BE SOLVED : To solve the problem that : a dose cannot be read repeatedly since electron states of a detection element subjected to a heat stimulus and a light stimulus once return to a base state although a TSL method or an OSL method is adopted as a measurement method of doses in a conventional dosimeter using a magnesium oxide and recorded doses are read by a heat stimulus and a light stimulus; and a material having high biological equivalence is requested because, for a phosphate glass based dosimeter generally used for measuring doses of X rays and γ rays, its atomic weight is large and thus it has low biological equivalence. SOLUTION : A magnesium oxide having a radio photoluminescence capacity can be obtained by setting the magnesium oxide to be a single crystal or sintered compact and further by adding rare earth elements, such as samarium by 0.001 mol% or larger and less than 1 mol%, as an activator agent. SELECTED DRAWING : Figure 2 COPYRIGHT : (C)2017, JPO&INPIT