Abstract
A graphite pile was constructed for routine calibration of radiation protection instruments. An isotropic thermal neutron irradiation field can be set up at the cavity in the pile. Also a collimated thermal neutron beam irradiation field can be set up at the outside facing the rectangular hole of pile. The sizes of irradiation fields are 200×276×170mm3 and 160×160mm2 respectively. Thermal neutron fluences are measured by the gold foil activation method. The over all error of fluence measurements is less than±2%. Intercomparison between ETL and JAERI on thermal neutron fluence rate measurements was done and the results have agreed within experimental errors. Distribution of fluence rate in the irradiation field are uniform with ±3%.
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