The development of a direct-gamma ray monitoring system for nuclear plants

Author

Murata, Yutaka ; Horiuchi, Norikazu

Author_Institution

Dept. of Electr. & Electron Eng., Musashi Inst. of Technol., Tokyo-Setagayaku, Japan

Volume

39

Issue

3

fYear

1992

fDate

6/1/1992 12:00:00 AM

Firstpage

457

Lastpage

460

Abstract

An environmental monitoring system using a source modulation technique was experimentally developed for the measurement of direct gamma rays emitted from nuclear plants. It has a rotary collimator with which the gamma component arriving at a detector is modulated as a sine-wave function of time. The intensity (dose rate) of direct gamma rays is determined from analyzing the cross correlation power spectrum density of the detector output. The sensitivity and angular resolution of the system were examined by using a ¹³⁷Cs source. The background component was reduced to less than 4% in comparison with the usual collimator. Direct gammas of 0.3 μR/h (0.79×10^-10C/kg/h) could be detected with an excellent angular characteristic

Keywords

gamma-ray detection and measurement; radiation monitoring; ¹³⁷Cs source; angular resolution; cross correlation power spectrum density; direct-gamma ray monitoring system; dose rate; nuclear plants; rotary collimator; sensitivity; source modulation technique; Background noise; Collimators; Gamma ray detection; Gamma ray detectors; Gamma rays; Monitoring; Nuclear measurements; Protection; Radiation detectors; Volume measurement;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.277544

Filename

277544