SYMPOSIA PAPER Published: 01 January 2001

Development of a Neutron and Gamma-Ray Flux Distribution Measurement System with Scintillator and Optical Fiber Combination


for the real time measurement of neutron flux and gamma-ray intensity distribution in reactor cores, a system composed of scintillator-optical fiber detector and fiber driver was newly tried. A pulse counting system that we successfully developed before was difficult to use in such an intense radiation field in the core, because there were very intense output of both scintillation light from the scintillator and Chernkov light in the optical fiber itself. The current from the photomultiplier was therefore measured this time. To distinguish the scintillation light component with longer wave length, 690 nm, from the Cherenkov light component with shorter wave length, an optical filter was used which had the cutoff wave length, 680 nm, just shorter than the scintillation wave length. However it was not possible to completely eliminate the Cherenkov component, therefore the difference between the signal from a fiber with the scintillator on the tip and the signal from the fiber without the scintillator was taken.

Author Information

Mori, C
Aichi Institute of Technology, Toyota, Japan
Uritani, A
Nagoya University, Nagoya, Japan
Iguchi, T
Nagoya University, Nagoya, Japan
Hayashi, S
Rikkyo University, Yokosuka, Japan
Kobayashi, H
Rikkyo University, Yokosuka, Japan
Takami, Y
Rikkyo University, Yokosuka, Japan
Kimura, I
Kyoto University, Kyoto, Japan
Katagiri, M
Japan Atomic Energy Reseach Institute, Ibaragi, Japan
Kakuta, T
Japan Atomic Energy Reseach Institute, Ibaragi, Japan
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Developed by Committee: E10
Pages: 769–774
DOI: 10.1520/STP13668S
ISBN-EB: 978-0-8031-5450-6
ISBN-13: 978-0-8031-2884-2