Title :
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
fDate :
6/1/1992 12:00:00 AM
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 (0.79×10-10 C/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;
Journal_Title :
Nuclear Science, IEEE Transactions on
