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Ando, Masaki; Matsuda, Norihiro; Saito, Kimiaki
Nihon Genshiryoku Gakkai Wabun Rombunshi, 16(2), p.63 - 80, 2017/05
In order to discriminate the contribution of radioactive cesium due to the Fukushima Dai-ichi Nuclear Power Plant accident to the air dose rates measured by the car-borne surveys, natural background radiation was evaluated for eastern Japan area as the municipality averaged values. The window count method for distinction between natural and artificial radioactive nuclides was applied to the car-borne surveys using the KURAMA-II. Distribution of the evaluated natural background radiation showed geological feature, and it was found that the radiations measured along paved roads were reflecting the distribution of terrestrial 
-rays. The effect of the radioactive cesium as of 2014 for the municipalities designated as the Intensive Contamination Survey Area was beyond the uncertainty of the natural background radiation. That for the other municipalities, however, was found to be almost negligible.
Kinase, Sakae
Nihon Genshiryoku Gakkai-Shi ATOMO
, 58(6), p.362 - 366, 2016/06
no abstracts in English
Kinase, Sakae; Sato, Satoshi; Sakamoto, Ryuichi*; Yamamoto, Hideaki; Saito, Kimiaki
Radiation Protection Dosimetry, 167(1-3), p.340 - 343, 2015/11
Times Cited Count：6 Percentile：45.92(Environmental Sciences)-ray survey systemSakamoto, Ryuichi; Tsutsumi, Masahiro
Nihon Genshiryoku Gakkai-Shi, 41(3), p.258 - 265, 1999/00
Times Cited Count：2 Percentile：21.17(Nuclear Science & Technology)no abstracts in English
Sakamoto, Ryuichi; Nagaoka, Toshi; Saito, Kimiaki; Tsutsumi, Masahiro; Moriuchi, Shigeru
JAERI-M 91-166, 67 Pages, 1991/10
no abstracts in English
Ando, Masaki; Matsuda, Norihiro; Sato, Tetsuro*; Saito, Kimiaki
no journal, ,
A series of measurements of air-dose rate has been performed with a car-borne survey system KURAMA-II over wide areas in eastern Japan since 2011 to obtain data to grasp distribution of air dose rates and the decreasing tendency. Air dose rate maps were constructed by the seven car-borne surveys. It was found that the decreasing trend of air dose rates measured through car-borne surveys was found to be more pronounced than those expected on the basis of the physical decay of radioactive cesium and of the air dose rates measured using NaI (Tl) survey meters in the areas surrounding the roadways. In addition, it was found that the extent of decrease in air dose rates was moderated through the car-borne surveys performed in 2013.
Kinase, Sakae; Sato, Satoshi; Sakamoto, Ryuichi*; Yamamoto, Hideaki; Saito, Kimiaki
no journal, ,
Ando, Masaki; Sato, Tetsuro*; Matsuda, Norihiro; Yamamoto, Hideaki; Saito, Kimiaki
no journal, ,
Results of analysis for JAEA's car-borne surveys until December 2013 using KURAMA-II systems and comparisons with man-borne survey performed in 2013 are presented.
Ando, Masaki; Saito, Kimiaki; Matsuda, Norihiro
no journal, ,
To evaluate contribution of natural radioactive nuclides to the air dose rate measured by car-borne survey in relatively low air dose range, a rapid method to distinguish natural radioactive nuclides was applied to a car-borne survey system KURAMA-II, and the availability was evaluated.
Saito, Kimiaki; Mikami, Satoshi; Ando, Masaki; Matsuda, Norihiro; Tsuda, Shuichi; Yoshida, Tadayoshi; Yoshimura, Kazuya; Sato, Tetsuro*; Kanno, Takashi; Yamamoto, Hideaki
no journal, ,
no abstracts in English
Ando, Masaki; Saito, Kimiaki; Matsuda, Norihiro
no journal, ,
As part of the investigation on distribution of air dose rates around the Fukushima Daiichi Nuclear Power Plant, car-borne surveys using KURAMA-II has been conducted over a wide area since 2011, and the measurement data of the air dose rates in the eastern Japan have been accumulated. The enormous amount of measurement data of the air dose rates were analyzed, and the decreasing trend of air dose rates was found to be depending on the evacuation order areas and the prefecture.
Ando, Masaki; Matsuda, Norihiro; Saito, Kimiaki
no journal, ,
Detailed analyses were carried out using measured data of car-borne surveys conducted from 2011 to 2017. It was found that there was a change trend depending on the measurement areas such as evacuation order areas.
Ando, Masaki; Mikami, Satoshi; Saito, Kimiaki
no journal, ,
Change trend of air dose rates obtained from the analysis of the car-borne surveys from 2011 to 2017 and the walking surveys from 2013 to 2017 is reported, especially on the comparison of the air dose rates inside and outside the evacuation order area and the result of exponential function fittings.
Kitayama, Yoshiharu; Terasaka, Yuta; Sato, Yuki
no journal, ,
We have developed a vehicle-mounted gamma-ray imaging system, iRIS-V. This system is capable of gamma-ray imaging around the vehicle and a car-borne survey similar to that of a monitoring car. This presentation will report the results of a car-borne survey of Route 35 in the difficult-to-return zone by iRIS-V and a gamma-ray imaging test around the entire vehicle using a 
Cs checking source.
Machida, Masahiko; Liu, X.*; Tanimura, Naoki*; Saito, Kimiaki
no journal, ,
no abstracts in English
Kitayama, Yoshiharu; Terasaka, Yuta; Sato, Yuki
no journal, ,
