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可在安卓获取Gamma Ray Calculator的历史版本
曝光时间计算器（和更多！）的无损检测技术人员。
Save time with this exposure calculator for Iridium-192, Selinium-75 and Cobalt-60 sources.
No more need to calculate the formula or use of the "old-school plastic calculator"
Simply fill in the thickness, activity(in Curies) and source-film-distance and you get the correct exposure time.
R factor for different densities and film types.