Reassessment of Nuclear Decay Database Used for Dose Calculation

Abstract

A comprehensive study has been completed for comparison of nuclear decay data for dosimetry calculations of ICRP Publication 38 (lCRP38) with those compiled from the recent Evaluated Nuclear Structure Data File (ENSDF), the latest version in August, 1997. In most nuclides, the values of the half-life, branching fraction and total energy of the radiations calculated from the ENSDF were in agreement with those of ICRP38. However, significant differences in these values were found in several nuclides, notably in 6oFe, 80Sr, 104m Ag, 123Te, 126Ba and 231Th. The causes for the differences were analyzed, and the influence ofthe revision of the decay data on the dose calculations was evaluated for the selected nuclides. The present results must be beneficial to a future revision ofICRP38.

Barite concrete-based cement composites for 252Cf spontaneous neutron and 60Co/192Ir shielding based on Monte Carlo computation

“…Where N is the total batch number, x i the tally results, w i the source weight of each sample, X the mean value of the tally results, and w the source weight of N samples. The PHITS input code was executed using the Radioactive decay process, a Data library from DECDC2 (Nuclear DECay Data for Dosimetry Calculation, Version 2) revised data of ICRP Publication 38 (Radionuclide Transformations -Energy and Intensity of Emissions) [18,49,50]. The time evolution during the simulation was not implemented as the half-life of the radionuclides used as the source is too higher than the irradiation time in the facility.…”