Itsumasa Urabe

Development of a moderating type higher sensitive rem counter using 6Li glass scintillator

Abstract A moderating type higher sensitive neutron rem counter was constructed using grains of 6 Li glass scintillator. The sensitivity of this counter is about 3.9 cps/(μSv/h), which is approximately 10 times higher than that of the commonly used rem counters and could be successfully applied for neutron monitoring both in the reactor room and the natural environment aided by the pulse-shape discrimination method.

Feasibility study on a continuous environmental gamma-ray monitor using a NaI(Tl) scintillation spectrometer.

Energy spectra of gamma rays due to artificial radionuclides could be estimated by using a NaI(Tl) scintillation spectrometer on the basis of the analysis of natural environmental gamma rays. This analysis system was applied to a continuous gamma-ray monitor in the vicinity of a nuclear facility, and a plume exposure rate due to gaseous effluents of about 6 X 10(-2) Ci hr-1 (2.2 X 10(9) Bq hr-1) could be estimated successfully downwind from the stack.