Simplified Calculation of Dynamic Decay Cascade in Common Use

Decay cascade equations describing the decay ways of radioactive isotopes are very complex due to the complexity of decay ways and variety of daughters. This work solved the decay dynamic functions and gave the simplified analytical answer equations in three forms by means of function matrix. The decay dynamic functions were simplified and can be easily used in application. Finally, nuclei number of every grade daughters of ²³⁹Pu was given and the decay heating power of ²³⁹Pu was also calculated.