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Igarashi, Junya*; Zhang, Z. J.*; Ninomiya, Kazuhiko*; Shinohara, Atsushi*; Satou, Yukihiko; Minowa, Haruka*; Yoshikawa, Hideki
KEK Proceedings 2019-2, p.54 - 59, 2019/11
no abstracts in English
Cl in soil near the Fukushima Dai-ichi Nuclear Power PlantOta, Yuki*; Sueki, Keisuke*; Sasa, Kimikazu*; Takahashi, Tsutomu*; Matsunaka, Tetsuya*; Matsumura, Masumi*; Tosaki, Yuki*; Honda, Maki*; Hosoya, Seiji*; Takano, Kenta*; et al.
JAEA-Conf 2018-002, p.99 - 102, 2019/02
no abstracts in English
Satou, Yukihiko; Sueki, Keisuke*; Sasa, Kimikazu*; Yoshikawa, Hideki; Nakama, Shigeo; Minowa, Haruka*; Abe, Yoshinari*; Nakai, Izumi*; Ono, Takahiro*; Adachi, Koji*; et al.
Geochemical Journal, 52(2), p.137 - 143, 2018/00
Times Cited Count：71 Percentile：96.41(Geochemistry & Geophysics)Yokoyama, Tatsunori; Misawa, Keiji*; Okano, Osamu*; Minowa, Haruka*; Fukuoka, Takaaki*
Journal of Radioanalytical and Nuclear Chemistry, 310(1), p.81 - 89, 2016/10
Times Cited Count：1 Percentile：9.88(Chemistry, Analytical)The identification of alkali-rich components in extraterrestrial materials along with their separation from other constituents is indispensable for subsequent cosmochemical and isotopic studies. This paper presents a simple pre-screening method for such materials by autoradiography using imaging plates (IPs), which is applicable to identification of mm-sized samples containing ca. 30 
g of potassium in the Yamayo-74442 chondrite. The detection limit of IPs was 
1 mBq of 
K under 49 days exposure. The method provides an opportunity to screen meteorite materials non-destructively and to inexpensively check potassium-rich areas and suitable for the K-Ca and K-Ar (
Ar-Ar) age determinations.
Satou, Yukihiko*; Sueki, Keisuke*; Sasa, Kimikazu*; Minowa, Haruka*; Yoshikawa, Hideki; Fujiwara, Kenso; Nakama, Shigeo
no journal, ,
We separated radioactive particles from soil and dust sample obtained around Fukushima Dai-ichi Nuclear Power Plant. Separated all particles can categorize unit-1 and unit-2 origin. And 
Sb was detected from unit-1 origin samples. Moreover, radioactive particle was made up 80 weight percent silica.
Satou, Yukihiko; Sueki, Keisuke*; Minowa, Haruka*; Yoshikawa, Hideki; Nakama, Shigeo; Fujiwara, Kenso
no journal, ,
no abstracts in English
Satou, Yukihiko; Sueki, Keisuke*; Matsuo, Kazuki*; Minowa, Haruka*; Yoshikawa, Hideki
no journal, ,
no abstracts in English
Satou, Yukihiko*; Sueki, Keisuke*; Minowa, Haruka*; Nakama, Shigeo; Yoshikawa, Hideki
no journal, ,
We obtained the soil sample close to the Fukushima Daiichi Nuclear Power Plant. The particle including highly cesium was separated from the soil sample. Estimated ratio of 
Cs to 
Cs is 0.90. This ratio accorded with 1st unit of Fukushima Daiichi Nuclear Power Plant.
Cl in surface soils near the Fukushima Dai-ichi Nuclear Power Plant using accelerator mass spectrometryOta, Yuki*; Sueki, Keisuke*; Sasa, Kimikazu*; Takahashi, Tsutomu*; Matsunaka, Tetsuya*; Matsumura, Masumi*; Tosaki, Yuki*; Hosoya, Seiji*; Takano, Kenta*; Ochiai, Yuta*; et al.
no journal, ,
no abstracts in English
Minowa, Haruka*; Yoshikawa, Hideki; Nakama, Shigeo; Satou, Yukihiko; Sueki, Keisuke*
no journal, ,
no abstracts in English
Sb and 
I in radioactive particles derived from FDNPPMatsuo, Kazuki*; Sueki, Keisuke*; Satou, Yukihiko; Yoshikawa, Hideki; Minowa, Haruka*; Sasa, Kimikazu*; Matsunaka, Tetsuya*; Matsumura, Masumi*; Takahashi, Tsutomu*; Sakaguchi, Aya*
no journal, ,
no abstracts in English
Satou, Yukihiko; Minowa, Haruka*; 45 of others*
no journal, ,
no abstracts in English
Cs/Cs ratio in indoor dust from near the Fukushima Daiichi Nuclear Power PlantMinowa, Haruka*; Yoshikawa, Hideki; Nakama, Shigeo; Satou, Yukihiko; Sueki, Keisuke*
no journal, ,
In this study, we aimed to estimate the diffusion distribution of radioactive Cs from each reactor source using the environmental samples. First, the influence of the sum-peak effect on the counting efficiency of Cs in the Ge detector was investigated for the accurately radioactive measurement, and applied it to the actual sample. To measure the variation of the counting efficiency depends on the distance between the Ge detector and a sample, a disk-shaped standard sample (25 mm
of filter paper) and a particle standard sample (200 m in size) were used. When the sample was placed close to the detector (distance 0.1 mm), the counting efficiency [cps/Bq] of Cs was about 20% lower than that of Cs in both the disk-shaped and the particle standard sample. It seemed to be caused by the sum-peak effect. "Smear paper" samples with indoor dust collected from about 40 points within 10 km from Fukushima Daiichi Nuclear Power Plant in 2014-2019 were measured, and Cs and Cs were quantified using the counting efficiency with the disk-shaped standard sample. From the Cs/Cs ratio at the time of the accident, the mixing ratio of materials derived from Reactors 1, 2 and 3 was estimated, and the spatial diffusion distribution of radioactive materials for each reactor was indicated.
Sueki, Keisuke*; Matsuo, Kazuki*; Sasa, Kimikazu*; Satou, Yukihiko; Yoshikawa, Hideki; Minowa, Haruka*
no journal, ,
no abstracts in English
Yoshikawa, Hideki*; Minowa, Haruka*; Dohi, Terumi; Sasaki, Yoshito
no journal, ,
no abstracts in English
Satou, Yukihiko*; Sueki, Keisuke*; Sasa, Kimikazu*; Minowa, Haruka*; Yoshikawa, Hideki; Fujiwara, Kenso; Nakama, Shigeo; Adachi, Koji*; Igarashi, Yasuhito*
no journal, ,
Radioactive particle including high density cesium were released caused by the Fukushima Daiichi nuclear disaster. In this study, we analyzed distribution of radioactive particle and its characteristic about obtained soils and dusts. As a result, radioactive particles were confirmed from soil sample. In particular, 100 micro meter in diameters particles were found at the point of north-northwest direction approximately 7km from the nuclear power plant. Found particles resembled an elementary composition and surface state of the particle found in the 20km northwest from nuclear power plant and Tsukuba.
