Model for the transport of radionuclides and their decay products through geologic media

The one-dimensional transport of radionuclides and their decay products from an underground nuclear waste isolation site through the surrounding geologic media to a surface environment is modeled. An ambiguity in the applicaion of the previously reported mathematical solution for this problem has been clarified. This solution is being used to evaluate the sensitivity of potential radioactivity releases into the environment to the characteristics of various nuclear waste isolation systems. The model is expected to be used in the future as an analytical standard to which the accuracy of numerical codes can be compared. 7 refs