Simulation analysis of thermal energy transfer caused by nuclear fission in spherical sell particle

Environmental sample particles collected inside or around nuclear facilities for the safeguards system are analyzed to conform whether their enrichment is within the declared value or not. The particle analysis such as fission track method inherently involves nuclear fission in the analysis process. When fission fragments accompanied by nuclear fission pass through the sample particle, they lose their kinetic energy in the form of exciting or ionizing other particles. Although only a small amount of the energy will be absorbed into the sample particle, how much the absorption of the energy will affect on the sample particle is well not known. Our attention is paid to the thermal energy transfer phenomenon from the microscopic point of view. A model particle is made up of spherical shell structure for computer simulations, and the substance surrounding the model particle plays a role of heat bath. We investigate that a linear heat source has effect on the particle structure from thermal energy transfer mechanism. Simulation analysis of unsteady state, thermal energy transfer is done by FT-III code. The results obtained here is to be present. (author)