A Light Effect of a Diamond Alpha Ray Counter

概要

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A diamond, cut in the form of plate, was coated in the parallel facts with evapolated aliminium. When the crystal was bombarded by alpha rays on the side, the counting rate was decreased by light. The wave length responsible for the effect was about 5000 Å. This light, applied more than one hour, did not increase the rate. In this point the effect differed from that of Willardson and Danielson. In the case of the bombardment through an electrode serface an opposite effect appeared. The rate was increased by the irradiation of the visible light to an equilibrium value, which depended on the wave length. But the light including ultraviolet, which makes a remarkable photoionization, decreased the rate after the maximum point. The increasing effect is understood by the release of the space charge as the experiment of Chynoweth. The decreasing effect seems to be attributed to the recombination of the earrier with the trapped one by the aide of the light, for the effect is observed only when the charge carrier drift in the plasma layer where both electrons and holes are trapped.
社団法人日本物理学会の論文
1952-02-25