Idea of an experimental technique for quantitative passive gamma emission tomography on irradiated nuclear fuel assemblies

An idea is presented in which passive gamma emission tomography of irradiated nuclear fuel is developed to enable quantitative information of the spatial activity distribution of selected isotopes within the fuel rods of the assembly. The idea is based on using well-known calibration sources mounted in the measurement device during measurement. The image reconstruction would include the sources, thereby enable quantification of the activity distribution. Should the idea be proven viable, the outcome would be valuable to the global community dealing with characterisation of nuclear fuel in terms of safety, security, safeguards and fuel development.

Evaporation behavior of 2LiF–BeF2–ZrF4 molten salt with irradiated nuclear fuel

The distribution and evaporation behavior of various components in FLiBe–ZrF4 containing irradiated ThF4 and UF4 molten salts was studied by low pressure distillation.