Apparatus development for measurement of (134)Cs and (137)Cs radioactivity of soil contaminated by the Fukushima Daiichi Nuclear Power Plant accident.
We developed an apparatus containing a NaI(Tl) scintillator to measure the (134)Cs and (137)Cs radioactivity of soil contaminated by the Fukushima Daiichi Nuclear Power Plant accident. The unfolding method with the least-squares technique was used to determine the radioactivity. Detector responses for each radionuclide in soil were calculated with EGS5 code for the unfolding method. The radionuclides that were measured were (40)K, (134)Cs, (137)Cs, (208)Tl, (214)Bi, and (228)Ac. The measured spectrum agreed well with the spectrum calculated from the response matrix and measured radioactivities. The unfolding method allows us to use the NaI(Tl) scintillator despite the overlap of peaks.
Graduate School of Engineering, Hiroshima University, 1-4-1, Kagamiyama, Higashi-Hiroshima 739-8527, Japan. Electronic address: kajimoto@hiroshima-u.ac.jp.
Tsuyoshi
T
Kajimoto
Graduate School of Engineering, Hiroshima University, 1-4-1, Kagamiyama, Higashi-Hiroshima 739-8527, Japan.
Satoru
S
Endo
Graduate School of Engineering, Hiroshima University, 1-4-1, Kagamiyama, Higashi-Hiroshima 739-8527, Japan.
Kenichi
K
Tanaka
Development Division, Kitagawa Iron Works Co., Ltd., 77-1, Motomachi, Fuchu 726-8610, Japan.
Yasuharu
Y
Okashiro
Development Division, Kitagawa Iron Works Co., Ltd., 77-1, Motomachi, Fuchu 726-8610, Japan.
Hiroaki
H
Kai
Development Division, Kitagawa Iron Works Co., Ltd., 77-1, Motomachi, Fuchu 726-8610, Japan.
Syuuji
S
Fujii
Development Division, Kitagawa Iron Works Co., Ltd., 77-1, Motomachi, Fuchu 726-8610, Japan.
Atsushi
A
Mishima
Measuring System Engineering Department, Hitachi Aloka Medical, Ltd., 3-7-19, Imai, Ome 198-8577, Japan.
Takahide
T
Matsubara
Measuring System Engineering Department, Hitachi Aloka Medical, Ltd., 3-7-19, Imai, Ome 198-8577, Japan.
Shinji
S
Yoshida
D002588:Cesium Radioisotopes / Q000032:analysis*; D004867:Equipment Design; D062406:Fukushima Nuclear Accident; D005720:Gamma Rays; D016018:Least-Squares Analysis; D012588:Scintillation Counting / Q000295:instrumentation* / Q000706:statistics & numerical data; D012990:Soil Pollutants, Radioactive / Q000032:analysis*
D002588:Cesium Radioisotopes; D012990:Soil Pollutants, Radioactive
(134)Cs; (137)Cs; Fukushima Daiichi Nuclear Power Plant; Soil radioactivity; Unfolding method