The two detector method was applied for kerma measurements in 15 MeV D-T mixed neutron-photon field. The hydrogenous detector employed is the thimble- type IRM 81-TE1 tissue equivalent ion chamber developed by us and the non-hydrogenous detector is the neutron-insensitive philips 18509 Geiger-Mueller counter. This paper describes the experimental devices
methods and measurement results. The results of IRM 81T-TE1 ion chamber are found to be in good agreement with values obtained by the FWT IC-17A ion chamber.
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