Feasibility Study of the One-Dimensional Radiation Distribution Sensing Method Using an Optical Fiber Sensor Based on Wavelength Spectrum Unfolding

Abstract We propose a novel one-dimensional radiation distribution sensing method using an optical fiber sensor based on wavelength spectrum unfolding for the application in measurement of high dose rate hot spots inside Fukushima Daiichi nuclear power station (FDNPS) buildings. The proposed estimates incident position to by output from edge premise that attenuation length light along depends wavelength. Because this measures integrated intensity, it can avoid problem counting loss and signal pile-up, which occurs detector with pulse mode under field. Basic properties source detection were confirmed through basic experiments ultraviolet 90Sr/90Y radioactive point source.