Word: dimmish
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Dates: during 1950-1959
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...sold by Boston's New England Nuclear Corp. The small metal cylinder (about i in. in diameter, 1½ in. long) has a plastic lens at one end, contains a long-lasting tritium "battery" produced at Oak Ridge. It will take twelve years for 'the light to dimmish 50%. Though its radioactivity is low, only persons licensed by the AEC can buy it, but the maker estimates that when the instrument is made available to the public the price will be about...