Abstract
The data of the “effective energies” which are necessary for the evaluation of the MPC values are listed in the form of a table. From this table one can easily find a necessary effective energy. The effective half-life can be found from a given graph. The terms carrying a time parameter are all represented graphically. The MPC values for several short-lived nuclides were calculated by the present method, and the results were compared with the values obtained from a strict method. The errors were less than 10%.
