568. 各種の核分裂片固体飛跡検出器による中性子線量測定

抄録

The properties of three types of solid state fission track detectors for neutron dosimetry have been studied. The detectors were irradiated with monochromatic fast neutrons and a count was made of the number of etch-pits on the surfaces of the irradiated detectors after etching with suitable chemical reagents.
The first type of detector examined was glass or mica, which was in contact with a thin film of thorium or uranium. The experiment proved that the sensitivity is in proportion to the amount of fissionable material per unit area. The second type was glass, mica or plastics, which was in contact with a thick foil of the fissionable material. It was shown that the measured sensitivity could be explained in terms of the range of the fission fragment in the fissionable material. The third type was metaphosphate glass, which was doped with thorium or/and uranium.. It was found that the dependence of the sensitivity on etching time could be explained from the thickness of the layer removed from the glass surface by the etching. A discussion is given of neutron dosimetry having a wide range of energy in mixed radiation fields with these detectors.