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DESCRIPTION OF PROBLEM OR FUNCTION - RIBD-IRT calculates isotopic concentrations resulting from two fission sources with normal down - chain decay by beta emission and isomeric transfers and inter-chain coupling resulting from ( n , gamma ) reactions . LLW and ILW may be further subdivided into catagories according to the half-lives of the radionuclides they contain , with " short-lived " waste decaying in less than 30 years and " long-lived " taking more than 30 years to decay . We present a family of finite-volume criteria which , under some mild restrictions on the distribution of the potential , cover the regime where the fractional moment decay condition holds . It is present in such ores because it is a member of the 238U decay series . As the lower stem decay develops , plants usually remain erect and foliage wilts .