Fiber Detector for Monitoring of Contaminated Water

Agency, Japan Atomic Energy

doi:10.5453/jhps.53.302

Cited by 2 publications

(1 citation statement)

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“…This method measures the incident position of radiation to the PSF from the time difference between two signals reaching both ends of the PSF [5,6]. Taking advantage of this characteristic, a PSF has been applied inside the FDNPS site to monitor the leakage of the contaminated water from a large container [7]. However, under the high dose rate radiation field (e.g., the FDNPS reactor buildings), which exceeds several mSv/h, the pile-up event of timing signal and chance coincidence effect in fiber increase, with the timing spectrum no longer reflecting the incident position of radiation [5].…”

Section: Introductionmentioning

confidence: 99%

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

Terasaka

Watanabe

Uritani

et al. 2021

Journal of Nuclear Engineering and Radiation Science

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

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Section: Introductionmentioning

confidence: 99%