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Journal of Nuclear Science and Technology Volume 58, 2021 - Issue 4: Special Issue on Fukushima Dai-ichi: Toward Environmental Restoration and Decommissioning of Damaged NPP
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Article

Radiation dose rate effects on the properties of a laser-induced breakdown spectroscopy system developed using a ceramics micro-laser for fiber-optic remote analysis

Koji Tamuraa Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology (QST), Tokai-mura, Ibaraki, Japan;b Collaborative Laboratories for Advanced Decommissioning Science, Japan Atomic Energy Agency (JAEA), Tokai-mura, Ibaraki, JapanCorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0001-7380-4446
ORCID Icon,
Hironori Ohbaa Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology (QST), Tokai-mura, Ibaraki, Japan;b Collaborative Laboratories for Advanced Decommissioning Science, Japan Atomic Energy Agency (JAEA), Tokai-mura, Ibaraki, Japan
,
Morihisa Saekia Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology (QST), Tokai-mura, Ibaraki, Japan;b Collaborative Laboratories for Advanced Decommissioning Science, Japan Atomic Energy Agency (JAEA), Tokai-mura, Ibaraki, Japan
,
Tomitsugu Taguchia Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology (QST), Tokai-mura, Ibaraki, Japan
,
Hwan Hong Limc Division of Research Innovation and Collaboration, Institute for Molecular Science (IMS), Myodaiji, Okazaki, Japan
,
Takunori Tairac Division of Research Innovation and Collaboration, Institute for Molecular Science (IMS), Myodaiji, Okazaki, Japan;d Laser-Driven Electron-Acceleration Technology Group, Riken Spring-8 Center (RSC), Sayo-gun, Hyogo, Japan
&
Ikuo Wakaidab Collaborative Laboratories for Advanced Decommissioning Science, Japan Atomic Energy Agency (JAEA), Tokai-mura, Ibaraki, Japan
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Pages 405-415 | Received 11 Aug 2020, Accepted 16 Nov 2020, Published online: 15 Dec 2020
 
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ABSTRACT

Radiation dose rate effects on the properties of a compact fiber-optic laser-induced breakdown spectroscopy (LIBS) system with a monolithic Nd:YAG/Cr:YAG composite ceramics were investigated for remote analysis in a hazardous environment. To investigate radiation effects on the LIBS signal, properties related to the Nd:YAG laser operation such as oscillation threshold, output energy, oscillation timing, temporal pulse shape, and beam profile was measured as a function of the radiation dose rate from 0 to 10 kGy/hr in view of their influences to the signal. LIBS spectra of zirconium metal were measured under irradiation. Although signal intensity decreased considerably by irradiation, informative spectra were well obtained even at the maximum radiation dose rate. From the comparison of the LIBS-related parameters among the laser properties, the signal reduction was mainly ascribed to the pulse energy reduction. Scintillation emission spectra were also measured from the ceramics during the irradiation, where the signal intensity increased linearly with the dose rate. The results show that the developed system is applicable to effective remote elemental analysis and monitoring of radiation dose rate in hazardous environments such as nuclear fuel debris inspection.

Acknowledgments

This work includes a part of the results of “Advanced study on remote and in-situ elemental analysis of molten fuel debris in damaged core by innovative optical spectroscopy,” the Center of World Intelligence Project for Nuclear S&T and Human Resource Development, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.

The authors would like to thank Mr. K. Akaoka of JAEA for comments on this manuscript.

Disclosure statement

No, potential conflict of interest was reported by the authors.

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