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-rays from fallout collected at Ibaraki, Japan, during the Fukushima nuclear accidentSaegusa, Jun; Kikuta, Yasuaki; Akino, Hitoshi
Applied Radiation and Isotopes, 77, p.56 - 60, 2013/07
Times Cited Count：9 Percentile：57.54(Chemistry, Inorganic & Nuclear)Measurements of -ray pulse height distributions were performed for a fallout sample collected at Ibaraki, Japan during the Fukushima accident in March, 2011. The fallout was collected in a pan of water, then evaporated to dryness on a stainless-steel holder. The sample was measured by a germanium detector three times over a year. In the pulse height distribution of the initial measurement, approximately 140 peaks were observed between 50 and 2048 keV energy region. Most of them were either total absorption peak or the sum peak of Te, I or Cs isotopes. Compared to the fallout sampled at the past nuclear accidents, while some nuclides such as Ce and Ru were not detected, 
Ag etc was prominently observed. Radioactivity concentration of 
Cs was estimated to be at least 1.4
10
Bq m
, approximately 14% of which was attributed to rainout.
Okura, Takehisa; Oishi, Tetsuya; Taki, Mitsumasa; Shibanuma, Yukio; Kikuchi, Masamitsu; Akino, Hitoshi; Kikuta, Yasuaki; Kawasaki, Masatsugu; Saegusa, Jun; Tsutsumi, Masahiro; et al.
JAEA-Data/Code 2012-010, 37 Pages, 2012/05
JAEA-Data-Code-2012-010.pdf:2.28MB
Due to the accident at Fukushima Daiichi Nuclear Power Plant caused by the 2011 off the Pacific coast of Tohoku Earthquake occurred at 11th March 2011, the emergency environmental radiation monitoring was conducted at Nuclear Science Research Institute, Japan Atomic Energy Agency (JAEA). This report provides the monitoring results of ambient -ray dose rate and atmospheric radioactivity concentration until the beginning of June 2011. Some anthropogenic radionuclides such as Cs-134, Cs-137, I-131, I-132, Te-132, Xe-133 and others were detected from air samples. The atmospheric radioactivity concentrations varied with some peaks corresponded with that of ambient -ray dose rate after 15th March 2011. Composition of each peak showed various characteristic. Internal exposure caused by inhalation was estimated from the observed atmospheric radioactivity.
Oishi, Tetsuya; Kikuchi, Masamitsu; Takahashi, Kenichi; Okura, Takehisa; Akino, Hitoshi; Kawasaki, Masatsugu; Kikuta, Yasuaki; Saegusa, Jun; Shibanuma, Yukio; Yamamoto, Hideaki
no journal, ,
no abstracts in English
-ray spectra of fallout collected at Tokai-mura during the Fukushima accidentSaegusa, Jun; Akino, Hitoshi; Kikuta, Yasuaki
no journal, ,
Measurements of -ray pulse height distributions (PHD) were performed for a fallout sample collected at Tokai-mura during Fukushima accident in March, 2011. The fallout was collected in a pan of water, then evaporated to dryness on a stainless-steel holder. The sample was measured by a Ge detector three times over a year. In the PHD of the initial measurement, approximately 140 peaks were observed between 50 and 2048 keV energy region. Most of the peaks were either the total absorption peak or the sum peak of Te, I or Cs isotopes. Compared to the PHDs of fallout sampled at the past nuclear accidents, while some nuclides such as 
Ce were not detected, 
Ag etc was prominently observed. Ratio of two different radionuclides, such as 
Zr/Nb, was no resemblance to that of the past data.
