Fiber-read radiation monitoring system using an optical fiber and red-emitting scintillator for ultra-high-dose conditions
Shohei Kodama, Shunsuke Kurosawa, Maki Ohno, Yuki Morishita, Hiroshi Usami, Masateru Hayashi, M. Sasano, Tetsushi Azuma, Hiroki Tanaka, Vladimir V. Kochurikhin, Akihiro Yamaji, Masao Yoshino, Satoshi Toyoda, Hiroki Sato, Yuji Ohashi, Kei Kamada, Yuui Yokota, Akira Yoshikawa, Tatsuo Torii
Abstract
We have developed a remote scintillation detector using a CCD spectrometer and a red-emitting scintillator coupled with a 20 m optical fiber for ultra-high-dose conditions. Gamma rays were detected with a conventional deep-red-emitting ruby scintillator and Cs2HfI6, which is a novel material with 700 nm red emission and a high light output. The scintillators were irradiated with gamma rays from a 60Co source under an effective dose rate from ∼0.002 to ∼1 kSv h−1. The integrated area of the Cs2HfI6 emission spectra was larger than that of the ruby, and good linearity of the Cs2HfI6 signal as a function of dose rate was confirmed.