Development of Wide-Area Radiation Monitor Using an Optical Fibe

We have developed a method for radiation distribution measurement by combining an optical fiber of wave-length shift type with plastic scintillators,and studied its properties to apply as a wide-area radiation moniter. The detector employs two photomu1tipliers in both ends of the fiber and locates the radiation position by using the difference of light arrival time from scintillators.We tested the detector with gamma-rays and neutrons concerning with the position-response and pulse-height respons of the detector. From the experiment,we confirmed the proper operation of the detector and position response with spatial resolution of 30-60 cm.