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Radiation distribution sensing with normal optical fiber

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11 Author(s)
Naka, R. ; Dept. of Nucl. Eng., Nagoya Univ., Aichi, Japan ; Watanabe, K. ; Kawarabayashi, J. ; Uritani, A.
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The purpose of this study is to develop a radiation distribution monitor using a normal plastic optical fiber. The monitor has a long operating length and can obtain continuous radiation distributions. A principle of the position sensing is based on a time-of-flight technique. The monitor is sensitive to beta rays or charged particles, gamma rays, and fast neutrons. The spatial resolutions for beta-rays (/sup 90/Sr-/sup 90/Y), gamma-rays (/sup 137/Cs), and D-T neutrons are 30, 37, and 13 cm, respectively. The detection efficiencies for the beta-rays, gamma-rays, and D-T neutrons are 0.11%, 1.6/spl times/10/sup -5/% and 1.2/spl times/10/sup -4/%, respectively. The effective attenuation length of the detection efficiency is 18 m. In this paper, we describe the basic characteristics of this monitor.

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Nuclear Science, IEEE Transactions on  (Volume:48 ,  Issue: 6 )