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Save time with this exposure calculator for Iridium-192, Selinium-75 and Cobalt-60 sources. ==> Pro version includes Barricade… Save time with this exposure calculator for Iridium-192, Selinium-75 and Cobalt-60 sources. ==> Pro version includes Barricade calculation for 2mR and 100Mr distance. 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.