Gamma calculator is an app to calculate 1) Exposure Time 2) Decay 3) Geometric Unsharpness 4) Decay Chart For One Year 5) Distance of Iridium-192 (Material-Steel,Concrete,Tungsten,Lead), Selinium-75 (Material-Steel,Concrete,Tungsten,Lead) and Cobalt-60 (Material-Steel,Concrete,Tungsten,Lead) source. > it shows the R-Factor. >It shows the Pipe Shedule . > it calculate decay chart for one year and convert it into pdf. Try it now.