Decay Chain Deduction of Uranium Fission Products

Abstract

Delayed gamma spectrum is the fingerprint of uranium materials in arms control verification technology. The decay chain is simplified into basic state linear chain and excitation state linear chain to calculate and analyze the delayed gamma spectra of fission products. Formulas of the changing rule for nuclide number before and after zero-time are deduced. The C program for calculating the delayed gamma ray spectra data is constructed, and related experiments are conducted to verify this theory. Through analysis of the delayed gamma counts of several nuclides, the calculated results are found to be consistent with experimental values.

Defect segregation facilitates oxygen transport at fluorite UO 2 grain boundaries

“…We have also provided information on the state of the grain boundaries within irradiated UO 2 . The presence of La 3+ in UO 2 is unavoidable as it forms through fission chain decay within the reactor [74]. These results show that La 3+ will increase the corrosion through oxygen diffusion and in the case of the Σ5 These results can be expected to be applicable to the wider field of fluorite grain boundaries.…”