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A Rarely-earth [...], as a scintillator element (24) can be used, the ratio of rare-earth is formed to alumina under Precision control, whereby the transparency within the elements is increased to a desired extent. The ceramic is formed, by including suitable submicron Rarely-earth oxide powder and submicron alumina powder are ground in a desired ratio. The milled powder shaped and sintered to form in a pressed body are then, with the desired transparency [...] the rare-earth.