In this paper. we present a straightforward analytical method for calculating the efficiencies of an ovoid shape (elliptical cylindrical) detector by using a randomly located point source. To determine the activity of an unknown radioactive source. absolute efficiency is required and we should take into account the attenuation of the gamma-ray photons by the source container and the d... https://bellfordtoysandhobbiers.shop/product-category/dice-sets/