title: Simple40K removal by acidified water leaching for estimating low levels of radiocesium in fishery products following Fukushima Dai-ichi Nuclear Power Plant accident.
abstract: We developed a simple method for40K removal by acidified water leaching combined with ammonium phosphomolybdate coprecipitation, for estimating low levels of radiocesium in Japanese flounder.40K removal from ashed samples was approximately 98%, with the radiocesium yield of ~98%. The treatment reduced the γ-spectral baseline to ~1/5 at ground and ~3/100 at underground levels (1.04 and 0.11 cph/keV, respectively). Faint signal of134Cs, which is embedded in the Compton continuum of40K in an untreated sample, was detected.
authors.affiliation: Low Level Radioactivity Laboratory, Kanazawa University, Wake O-24, Nomi, Ishikawa 923-1224, Japan. Electronic address: i247811@staff.kanazawa-u.ac.jp.
authors.forename: M
authors.initials: M
authors.lastname: Inoue
authors.affiliation: Low Level Radioactivity Laboratory, Kanazawa University, Wake O-24, Nomi, Ishikawa 923-1224, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Yamashita
authors.affiliation: National Research Institute of Fisheries Science, Japan Fisheries Research and Education Agency, 2-12-4 Fukuura, Kanazawa, Yokohama, 236-8648, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Fujimoto
authors.affiliation: Low Level Radioactivity Laboratory, Kanazawa University, Wake O-24, Nomi, Ishikawa 923-1224, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kofuji
authors.affiliation: National Research Institute of Fisheries Science, Japan Fisheries Research and Education Agency, 2-12-4 Fukuura, Kanazawa, Yokohama, 236-8648, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Miki
authors.affiliation: Low Level Radioactivity Laboratory, Kanazawa University, Wake O-24, Nomi, Ishikawa 923-1224, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Nagao
mesh_terms: D000818:Animals; D002588:Cesium Radioisotopes / Q000032:analysis*; D005398:Fisheries; D005432:Flounder / Q000378:metabolism*; D005590:Fractional Precipitation; D062406:Fukushima Nuclear Accident; D006863:Hydrogen-Ion Concentration; D007564:Japan; D008982:Molybdenum; D010756:Phosphoric Acids; D011197:Potassium Radioisotopes / Q000302:isolation & purification*; D011834:Radiation Monitoring; D014867:Water; D014875:Water Pollutants, Radioactive / Q000032:analysis*
chemical_list: D002588:Cesium Radioisotopes; D010756:Phosphoric Acids; D011197:Potassium Radioisotopes; C000615339:Potassium-40; D014875:Water Pollutants, Radioactive; D014867:Water; C000614989:Cesium-137; D008982:Molybdenum; C000614987:Cesium-134; C003125:phosphomolybdic acid
keywords: (40)K; Fishery product; Fukushima Dai-ichi Nuclear Power Plant accident; Radioactive monitoring; Radiocesium; γ-spectrometry