坑内室内兼用ベータ線精密測定装置DC-P1型

抄録

In order to measure precisely the beta-radioactivity of ores in galleries, the present writers have constructed a special beta counter, "Type-DC-P1", which has been confirmed by experiments to be of high quality. It is composed of a lead shielded probe, a tripod, cables, a counter using decatrons, colloid batteries, a charger, a timer and a stand which enables us to perform precise measurement in laboratory using the same probe as in the fields. Its probe and counter are not only water-proof but also air-tight, and can be employed adequately in galleries with air of high humidity or of high radioactivity. Its background count is considerably low and stable. The data obtained by means of the DC-P 1 can be analyzed according to the calculations introduced by one of the present writers (N.K.) in other papers, rendering possible the estimation of content of radioactive isotopes in ores.