Interpolation of gamma-ray buildup factors for point isotropic source with respect to atomic number

The values of buildup factors for a specific energy above KAPPA edges and penetration distance vary smoothly with respect to atomic number. An interpolation of buildup factors for an arbitrary elemental material is examined using geometric-progression (G-P) parameters for an equivalent atomic number. The G-P parameters are data fitted to the proposed American National Standard Buildup factor data compilation of 17 elements from beryllium to molybdenum and are calculated by the moments method.