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Basic spark counting characteristics of cellulose nitrate films 13μm thick stripped off from the polyester bases of LR-115 Type II and LR-115 Type II Stripping made by KODAK-PATHÉ in France were investigated. Detector films irradiated with α-ray were etched with NaOH solution, sandwiched between copper and aluminized sheet electrodes, and the number of sparks was counted with a scaler. Results obtained were as follows:1) Optimum etching condition was 26% NaOH solution at 50°C and etching time was 140min.2) Sparking voltages were 600V for punching and 425V for counting.3) Optimum thickness of polycarbonate sheet for a moderator was 20μm.4) The relation between irradiation time and number of counts was linear up to about 1, 000/cm2.LR-115 Type II Stripping B, which was sticked with thin LiBO2 layer on one side of the film, was also examined. It was irradiated with neutron produced from the reactor of Kinki University. Neutron fluence was estimated from spark counting of α-tracks produced by (n, α) reaction. The relation between spark counts and neutron fluence was linear between 2×108 and 4×109n/cm2.
日本保健物理学会の論文