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Development of onsite/in-situ, rapid and radio-resistance remote analysis by optical fiber based laser induced breakdown spectroscopy

若井田 育夫; 大場 弘則; 赤岡 克昭; 宮部 昌文; 佐伯 盛久; 大場 正規; 伊藤 主税; 加藤 政明

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For the decommissioning of "Fukushima Daiichi Nuclear Power Station" which contained damaged or melt downed core, development of rapid, easy, onsite and in-situ remote diagnostic/analysis techniques under the severe environments such as extremely high radioactive condition, will be strongly required. In order to accomplish these requirements, the concept of probing by light and diagnostic by light with radiation resistant optical fiber will be one of the simple, powerful and applicable choices without sensor hardening technique. Optical Fiber based LIBS probe is constructed, and we have successfully observed some specific spectra from the simulated sample of molten debris made by sintered oxide of Zr and U under water condition, and also observed the spectrum from simulated metal sample under radioactive condition of 10 kGy/h and after total dose of 2 MGy.

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