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池田 裕二*; Soriano, J. K.*; 大場 弘則; 若井田 育夫
Scientific Reports (Internet), 13, p.4828_1 - 4828_9, 2023/03
被引用回数：6 パーセンタイル：97.94(Multidisciplinary Sciences)We report on the analysis of pure Gd oxide and its detection when mixed in surrogate nuclear debris using microwave-enhanced fiber-coupled micro-laser-induced breakdown spectroscopy. The target application is remote analysis of nuclear debris containing U inside the Fukushima Daiichi Nuclear Power Station. The surrogate nuclear debris used in this study contained Gd, Ce, Zr and Fe. The sample was ablated by microchip-laser under atmospheric pressure conditions while a helical antenna propagated 2.45 GHz 1.0 kW microwaves for 1.0 ms into the laser ablation plume. The results showed that microwave-induced plasma expansion led to enhanced emission signals of Gd I, Zr I, Fe I, Ce I, and Ce II. Microwave irradiation enhanced the standard deviations of the Gd and Ce emissions and lowered the detection limit of Gd by 60%.
狩野 貴宏; 赤岡 克昭; 大場 弘則; 若井田 育夫; Soriano, J. K.*; 池田 裕二*
no journal, ,
Measuring the composition of uranium isotopes in debris is important for the decommissioning of the Fukushima Daiichi Nuclear Power Station. Analysis of isotopes by laser induced breakdown spectroscopy (LIBS) requires a high-resolution spectrometer. However, the emission intensity becomes weaker when a high-resolution spectrometer is used. Therefore, we used microwave-enhanced LIBS for isotope measurements. Microwaves can improve spectral intensity. A microchip laser (Nd:YAG/Cr:YAG composite ceramics, wavelength: 1064 nm, laser energy: 1.0 mJ) was used in this experiment. The number of laser shots was 200 and the number of measurements was 5 for each sample. The microwave output at 2.45 GHz was 1000 W and the pulse length was 1.0 ms. We found out that the evaluation of uranium enrichment using microwave is better than without microwave.
狩野 貴宏; 赤岡 克昭; 大場 弘則; 若井田 育夫; Soriano, J. K.*; 池田 裕二*
no journal, ,
レーザー誘起ブレークダウン分光(LIBS)による測定の際、同位体を測定できる程の高分解能の分光器を用いると測定されるプラズマの発光強度は小さくなりSN比が悪くなってしまう。そこで、マイクロ波を用いて発光強度を増やすことで、ウラン同位体の測定を行う際のSN比を改善した。
