Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Wakaida, Ikuo; Akaoka, Katsuaki; Miyabe, Masabumi; Khumaeni, A.; Oba, Hironori; Saeki, Morihisa; Ito, Chikara; Otobe, Haruyoshi; Kato, Masaaki
no journal, ,
In the next generation nuclear fuel cycle, low-decontaminated fuel with TRU will be strongly required, and convenience, quick analytical techniques will be necessary. Simultaneous analysis of element and isotope by the combination of Laser Induced Breakdown Spectroscopy (LIBS) and Ablation Resonance Absorption Spectroscopy was demonstrated. For elemental analysis, detection lower limit of 1000 ppm of Pu in U oxide and relative error under 5% have been obtained within 5 min. For isotope analysis, 
Pu and 
Pu have been observed completely separated, and detection lower limit of several 10 ppm and error under 1% have been accomplished. A simple antenna coupled microwave assisted LIBS was performed and the enhancement of emission intensity of several 10 times was demonstrated. For liquid sample, ultra-thin laminate flow as the laser focused target was accomplished high sensitivity of ppb. For in-situ monitoring, Optical Fiber LIBS Probe by radiation resistant optical fiber is under construction.
Wakaida, Ikuo; Akaoka, Katsuaki; Miyabe, Masabumi; Kato, Masaaki; Otobe, Haruyoshi; Oba, Hironori; Khumaeni, A.
no journal, ,
In Japan Atomic Energy Agency (JAEA), research and development of quick analysis for next-generation MOX fuel without chemical analysis and neutron measurement had been carried out as the entrusted project by MEXT, and basic performances by using un-irradiated MOX fuel were demonstrated. In elemental analysis by Laser Induced Breakdown Spectroscopy (LIBS) with high resolution spectrometer, relative error of 2.9% at 30% Pu and the detection lower limit of 2,500 ppm in U oxide were demonstrated with the operation time of 5 min.. In isotope ratio analysis by Ablation Resonance Absorption Spectroscopy, tunable semiconductor laser system was constructed, and the relative deviation less than 1% in the ratio of Pu/Pu and sensitivity of 30-100 ppm in U were also accomplished within 5min. operation. As for an analysis in liquid sample, ultra-thin laminate flow was experimented as LIBS target, and the sensitivity comparable to conventional ICP-AES was confirmed.
Wakaida, Ikuo; Akaoka, Katsuaki; Miyabe, Masabumi; Khumaeni, A.; Oba, Hironori; Ito, Chikara
no journal, ,
In the new concept of next generation nuclear fuel cycle for long lived radioactive waste disposal by use of Accelerator Driven Subcritical reactor (ADS Cycle) and by a fast breeder reactor (FBR Cycle), utilization of low-decontaminated fuel with TRU will be promoted. Simultaneous analysis of element and isotope by the combination of Laser Induced Breakdown Spectroscopy (LIBS) and Ablation Resonance Absorption Spectroscopy was demonstrated by MOX fuel. For elemental analysis, detection lower limit of 1000 ppm of Pu in U oxide and relative error under 5% have been obtained within 5 min. For isotope analysis, Pu and Pu have been observed separately, and detection lower limit of several 10 ppm and error under 1% have been accomplished. A simple antenna coupled microwave assisted LIBS was performed and the enhancement of emission intensity of several 10 times was demonstrated. For liquid sample, ultra-thin laminate flow as the laser focused target was accomplished high sensitivity of ppb. For in-situ monitoring, Optical Fiber LIBS Probe by radiation resistant optical fiber is under construction.
Wakaida, Ikuo; Oba, Hironori; Miyabe, Masabumi; Akaoka, Katsuaki; Oba, Masaki; Tamura, Koji; Saeki, Morihisa; Nakanishi, Ryuzo; Ikeda, Yuji*; Sakka, Tetsuo*; et al.
no journal, ,
no abstracts in English
Wakaida, Ikuo; Oba, Hironori; Miyabe, Masabumi; Akaoka, Katsuaki; Oba, Masaki; Tamura, Koji; Saeki, Morihisa; Nakanishi, Ryuzo; Ikeda, Yuji*; Sakka, Tetsuo*; et al.
no journal, ,
Miyabe, Masabumi; Yamada, Tomonori; Shibata, Takuya; Ito, Chikara; Daido, Hiroyuki; Hasegawa, Shuichi*
no journal, ,
It is expected that laser cutting process will be used in decommissioning for nuclear facilities, but there are concerns about environmental pollution due to the fume generated during laser cutting. To clarify the formation mechanism and characteristics of atoms and fine particles in the fume and to rapidly analyze the isotopic composition, we conducted atomic spectroscopy associated with laser ablation and an experiment to decompose the fine particles by optical fragmentation process. When diode laser was tuned to the resonance wavelength of 
Ca in ground state and the temporal variation of the transmittance was observed with an oscilloscope, the recovery of the transmittance due to the disappearance of the neutral atoms was observed within a few milliseconds after the ablation. After another 50 ms, when the fragmentation laser beam was irradiated to the plume composed of remaining fine particles, being careful not to hit the sample, pulse-like attenuation of the transmitted light due to atomic absorption was observed again. When ablation laser beam is blocked and only the fragmentation beam is irradiated, the attenuation o the transmittance disappear; thus it is confirmed that the signal is derived from the decomposed fine particles. This study suggests that the possibility of online analysis by fragmentation of fine particles generated during laser cutting.