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Tomita, Ryohei; Tomita, Jumpei; Suzuki, Daisuke; Yasuda, Kenichiro; Miyamoto, Yutaka
Hosha Kagaku, (48), p.1 - 15, 2023/09
Secondary Ion Mass Spectrometry (SIMS) is the method to detect secondary ions produced by the sputtering of primary ions. SIMS is one of effective method to measure isotopic composition of particles containing nuclear material in environmental sample for safeguards. We are a group member of the International Atomic Energy Agency (IAEA)'s network of analytical laboratories and have developed analytical techniques using SIMS and other mass spectrometers for nuclear safeguards. We will introduce the principle of SIMS and analytical techniques developed by our group to measure isotopic composition of uranium particles which having a particle diameter of micron order in environmental sample for safeguards.
Yamamoto, Hiroyuki; Saito, Takeru; Asaoka, Hidehito
Journal of Trace and Microprobe Techniques, 19(4), p.571 - 579, 2001/11
Times Cited Count：4 Percentile：14.60(Chemistry, Analytical)no abstracts in English
Yamamoto, Hiroyuki; Saito, Takeru; Asaoka, Hidehito
Applied Surface Science, 178(1-4), p.127 - 133, 2001/07
Times Cited Count：5 Percentile：31.66(Chemistry, Physical)no abstracts in English
Esaka, Fumitaka; Zheng, W.*; Watanabe, Kazuo; Magara, Masaaki; Hanzawa, Yukiko; Usuda, Shigekazu; Adachi, Takeo
Advances in Mass Spectrometry, 15, p.973 - 974, 2001/00
no abstracts in English
; Mita, Naoaki; Nishino, Yasuharu; Amano, Hidetoshi
JAERI-Conf 99-009, p.103 - 111, 1999/09
no abstracts in English
Yamamoto, Hiroyuki; Baba, Yuji
Applied Physics Letters, 72(19), p.2406 - 2408, 1998/05
Times Cited Count：9 Percentile：42.41(Physics, Applied)no abstracts in English
Tagomori, Hisaya*; Kawamura, Hidehisa*; Kusano, Keiichi*; Dohi, Terumi
no journal, ,
To investigate their spatial distribution and physicochemical properties of the radiocaesium-bearing micro particles (CsMPs), an efficient methodology for determine and analysis them is required. Here we focused on CsMPs from litters as they may affect the radiocaesium cycling in forest ecosystem. In this study we developed a method to determine CsMPs (mostly 1-10 
m sizes) from litters by combine digestion treatment and automatic particle analysis with FE-EPMA. In total it took up to 3 days for detecting one CsMP from huge amounts of mineral-like and metallic particles. In the ToF-SIMS analysis for Cs isotope ratios of CsMPs to understand their emission source as the next step, pretreatment for easily detecting micron-sized samples is needed. To solve this problem, FIB technique was used for Gallium marking formation around target sample. Preliminary Cs isotope ratios(133Cs, 134(Cs + Ba), 135Cs, 137(Cs + Ba)) and their distributions of CsMPs were determined by applying these approaches. We developed pretreatment for microscopy and ToF-SIMS analysis of CsMPs.
Tomita, Ryohei; Tomita, Jumpei; Suzuki, Daisuke; Yasuda, Kenichiro; Miyamoto, Yutaka
no journal, ,
In this study, we tried to solve the problem of electrostatic discharge on uranium particle based by porous silicon particle and to analyze uranium isotopic ratio of the uranium particle-based silicon by SIMS with high accuracy. Experimental results showed that primary beam of negative oxygen (O
) is effective to compensate charge of uranium particle-based silicon. The negative primary beam also enable us to analyze uranium isotopic ratio of the uranium particle-based silicon within 2
range of standard deviation.
