The ecological half-life of radiocesium in surficial bottom sediments of five ponds in Fukushima based on <i>in situ</i> measurements with plastic scintillation fibers

Katengeza, Estiner W.; Sanada, Yukihisa; Yoshimura, Kazuya; Ochi, Kotaro; Iimoto, Takeshi

doi:10.1039/d0em00160k

Cited by 7 publications

(3 citation statements)

References 45 publications

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“…On the other hand, macroscopic effects of radiation on optical fibers are relatively clearer which includes radiation‐induced attenuation (RIA), radiation‐induced‐emission (RIE), and radiation‐induced refractive‐index‐change (RI‐RIC). Radiation sensing can be realized by monitoring RIA and RIE, and a wide range of optical waveguides including plastic scintillation fiber, [ 117 ] various silica fiber, [ 118 ] rare‐earth doped fiber, [ 119 ] polarization maintaining fiber (PMF), [ 120 ] and photonic crystal fiber (PCF) [ 121 ] have already been evaluated under radiation environment. It is noted that few sensors are developed based on RI‐RIC because the RI‐RIC are usually coupled with RIC and RIA effects making its demodulation very difficult.…”

Section: Applicationsmentioning

confidence: 99%

Fabrication and Application of Single Crystal Fiber: Review and Prospective

Liu

Ohodnicki

2021

Adv Materials Technologies

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The state of the art of single crystal fiber (SCF) fabrication has evolved and improved over the last five decades. Nowadays, edge‐defined film‐feed growth, micro‐pulling down, and laser heated pedestal growth are three major techniques for the fabrication of SCF. Solid state crystal growth and temperature gradient technology are also very active recently making small size SCF. These optical fiber growth techniques are powerful material research tools employed globally for both scientific inquiry and practical applications. This article introduces the development of SCF growth techniques, with particular emphasis on recent practical applications including temperature sensing, radiation environment sensing, fiber laser and power delivery, chemical and medical application, imaging application, and piezoelectric application. In all cases, the application‐oriented point of view provides the reader with an up‐to‐date panorama of the vast possibilities offered by SCF. In the end, perspectives on the trends and future development of single crystal fibers are discussed.

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Section: Applicationsmentioning

confidence: 99%

Fabrication and Application of Single Crystal Fiber: Review and Prospective

Liu

Ohodnicki

2021

Adv Materials Technologies

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“…Consequently, PSOF detectors have been utilized extensively for the localization and quantification of radiation sources across various contaminated areas and for monitoring radiation in liquid environments. Following the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, the Japan Atomic Energy Agency (JAEA) used a PSOF detector in field studies to evaluate surface contamination in forest areas and to determine radiocesium levels in sediments from Fukushima's irrigation ponds [2][3][4]. Additionally, in February 2020, the Tokyo Electric Power Company (TEPCO) implemented a PSOF detector in the FDNPP drainage system to monitor 90 Sr, commencing operations [5].…”

Section: Introductionmentioning

confidence: 99%

Acquiring Gamma-Ray Energy Spectrum Using a Plastic Scintillation Optical Fiber Detector

Song,

Park,

Kim

et al. 2024

Photonics

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The plastic scintillation optical fiber (PSOF) detector, characterized by its large contact area with measurement targets, effectively detects and quantifies radiation in diverse radiation-contaminated areas and liquid environments. While it is extensively utilized for measuring alpha, beta, gamma, and neutron radiations, comprehensive documentation on the spectrum measurement and energy calibration methods for gamma nuclides has not been reported. Accurate energy calibration is crucial for the precise quantification of radiation doses from various sources. The pulse-height spectrum produced by the PSOF detector does not display a Compton maximum because of the significant Gaussian energy broadening. Additionally, this spectrum compresses as the distance increases between the radiation source and the light measurement device. In this study, the energy spectrum of a PSOF for gamma nuclides was characterized by energy calibrations using Compton edge (CE). The CE channel in the measurement spectrum of the PSOF detector for three gamma nuclides was identified using the first-order differentiation method. This technique was successfully applied to spectra measured at various radiation source positions to determine the attenuation coefficients. The proposed energy calibration method allows for the conversion of pulse-height spectra obtained from alpha, beta, and neutron radiation measured with PSOF detectors into energy spectra.

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“…With this method, however, the sample becomes radioactive waste, and distribution assessment over the entire pond becomes impossible [13]. Monitoring data measured by PSOF detectors were used to assess the ecological half-life of the radiocesium concentration in the sediment of five ponds in Fukushima from 2013 to 2019 [14].…”

Section: Introductionmentioning

confidence: 99%

High-Spatial-Resolution Position-Sensitive Plastic Scintillation Optical Fiber Bundle Detector

et al. 2021

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We fabricated a 5 m long position-sensitive plastic scintillation optical fiber (PSOF) bundle detector composed of a sensing probe, two photomultiplier tubes (PMTs), two fast amplifiers, and a digitizer. Seven PSOFs in a bundle were used as sensing probes to estimate the gamma-ray source position, and 60Co, an uncollimated solid-disc-type radioactive isotope, was used as a gamma-ray emitter. To improve on the spatial resolution of previous studies, the transit time spread (TTS) was reduced by using a high-timing-response PMT and a bundle type of multi-cladded PSOFs. Noise was filtered out of the data. In addition, the accuracy of the data was improved through cubic spline interpolation. We determined the measurement time and measured the full width at half maximum (FWHM) considering the spatial resolution. We obtained the best spatial resolution—compared to the results of earlier studies—using our proposed bundle detector. Moreover, the sensitivity of the PSOF bundle detector was evaluated at several positions in the sensing probe. Based on the results of this study, a position-sensitive PSOF bundle detector could be used to measure gamma-ray source positions accurately over a wide contaminated area and in a shorter period of time.

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The ecological half-life of radiocesium in surficial bottom sediments of five ponds in Fukushima based on in situ measurements with plastic scintillation fibers

Abstract:
Ecological half-life (T_eco) of ¹³⁷Cs concentration over wide pond areas of surface sediments was evaluated from in situ monitoring with plastic scintillation fibers (PSF) between 2013 and 2019.

Cited by 7 publications

References 45 publications

Fabrication and Application of Single Crystal Fiber: Review and Prospective

Fabrication and Application of Single Crystal Fiber: Review and Prospective

Acquiring Gamma-Ray Energy Spectrum Using a Plastic Scintillation Optical Fiber Detector

High-Spatial-Resolution Position-Sensitive Plastic Scintillation Optical Fiber Bundle Detector

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The ecological half-life of radiocesium in surficial bottom sediments of five ponds in Fukushima based on in situ measurements with plastic scintillation fibers

Abstract: Ecological half-life (Teco) of 137Cs concentration over wide pond areas of surface sediments was evaluated from in situ monitoring with plastic scintillation fibers (PSF) between 2013 and 2019.

Cited by 7 publications

References 45 publications

Fabrication and Application of Single Crystal Fiber: Review and Prospective

Fabrication and Application of Single Crystal Fiber: Review and Prospective

Acquiring Gamma-Ray Energy Spectrum Using a Plastic Scintillation Optical Fiber Detector

High-Spatial-Resolution Position-Sensitive Plastic Scintillation Optical Fiber Bundle Detector

Contact Info

Product

Resources

About

Abstract:
Ecological half-life (T_eco) of ¹³⁷Cs concentration over wide pond areas of surface sediments was evaluated from in situ monitoring with plastic scintillation fibers (PSF) between 2013 and 2019.