Dyes Film Radiation Indicator

概要

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For the purpose of simple and convenient monitoring radiation in irradiation processing of foods, we have developed polyvinyl chloride films dyed with the mixture of aniline blue and butter yellow dissolved in ethylene bromide. These were slightly modified from the color films which had been developed by us for the use of color radiography intended to amplify discernibility of the image in nondestructive testing. Indicator film dyed only by yellow dye such as butter yellow, diethylyellow or meta-methyl red showed a narrow range of the color change on irradiation, but, this newly developed one indicated a stepwise conversion of its color by irradiation from blue-green to red and finally to colorless through green, yellow and orange indue course. By varying the dye concentration and thickness of film, film indicator possessing capacity to detect different dose range can be prepared, for example, from 0.5×104 to 5×104 rad, from 2×105 to 6×105 rad, or from 1×106 to 6×106 rad, respectively. Such blue dye as methylene blue which had been known in the field of radiation chemistry was found not suitable for the indicator owing to its low sensitivityto radiation. Quinoline blue or indophenol was observedfeasible for the use as well as aniline blue.
日本食品照射研究協議会の論文