title: Measurement of 90Sr in contaminated Fukushima soils using liquid scintillation counter.
abstract: A method based on liquid scintillation counting system has been developed for the measurement of (90)Sr in Fukushima soil samples due to contamination of (134)Cs and (137)Cs. Three soil samples were collected within 30 km radius from the Fukushima Daiichi Nuclear Power Plant (FDNPP). Activity concentration of (134)Cs and (137)Cs were measured using a gamma spectroscopy system with high-purity germanium detector. (90)Sr contamination is little elevated but comparable with the background contamination level that originated from atmospheric nuclear weapon tests, whereas radiocesium contamination has increased significantly. Activity concentration of (90)Sr in the soil samples varied in the range of 10.4±0.6-22.0±1.2 Bq kg(-1). Activity concentrations of (134)Cs and (137)Cs in the soil samples were in the range of 28.2±0.2-56.3±0.2 kBq kg(-1) and 35.2±0.1-70.2±0.2 kBq kg(-1), respectively (reference date for decay correction is 1 December 2011).
authors.affiliation: National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555 Japan.
authors.forename: N
authors.initials: N
authors.lastname: Kavasi
authors.affiliation: National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555 Japan sahoo@nirs.go.jp.
authors.forename: S K
authors.initials: SK
authors.lastname: Sahoo
authors.affiliation: National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555 Japan.
authors.forename: H
authors.initials: H
authors.lastname: Arae
authors.affiliation: National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555 Japan.
authors.forename: S
authors.initials: S
authors.lastname: Yoshida
authors.affiliation: Fukushima Medical University, 1 Hikarigaoka, Fukushima city, Fukushima 960-1295 Japan.
authors.forename: A
authors.initials: A
authors.lastname: Sorimachi
authors.affiliation: Hirosaki University, 66-1 Hon-cho, Hirosaki City, Aomori 036-8564, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Tokonami
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D062406:Fukushima Nuclear Accident; D007564:Japan; D011834:Radiation Monitoring / Q000295:instrumentation*; D011847:Radioactive Fallout / Q000032:analysis*; D015203:Reproducibility of Results; D012588:Scintillation Counting; D012680:Sensitivity and Specificity; D012990:Soil Pollutants, Radioactive / Q000032:analysis*; D013326:Strontium Radioisotopes / Q000032:analysis*
chemical_list: D011847:Radioactive Fallout; D012990:Soil Pollutants, Radioactive; D013326:Strontium Radioisotopes