Abstract
Imaging plate detectors, having a sensitivity of about a hundred times greater than that of conventional X-ray films, are finding extension into many fields as a two-dimensional position detector for radiations. The imaging plate has a large area, of 20 cm × 25 cm, or even larger 35 cm × 43 cm, and a spatial resolution of about 100 μm × 100 μm (i.e. a pixel). The sensitivity of the plate to α-rays was investigated here; even a single incident α-ray can be detected and the signal output was found to be linear up to at least thi thirty incident α-rays per pixel. Plutonium fine particles in the environmental air of a nuclear fuel processing cell were collected on a filter paper. The plate was then exposed to α-rays emitted from the filter and the diameters of the fine particles could be determined by the output signal intensity from the plate.
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