title: [Radioactive cesium analysis in radiation-tainted beef by gamma-ray spectrometry with germanium semiconductor detector].
abstract: The detection limit and precision of radioactive cesium measurement in beef by gamma-ray spectrometry with a germanium semiconductor detector were evaluated. Measurement for 2,000 seconds using a U-8 container (100 mL) provided a detection limit of radioactive cesium (the sum of 134Cs and 137Cs) of around 20 Bq/kg. The 99% confidence interval of the measurement of provisional maximum residue limit level (491 Bq/kg) samples ranged from 447 to 535 Bq/kg. Beef is heterogeneous, containing muscle and complex fat layers. Depending on the sampled parts, the measurement value is variable. It was found that radioactive cesium content of the muscle layer was clearly different from that of fat, and slight differences were observed among parts of the sample (SD=16.9 Bq/kg), even though the same region (neck block) of beef sample was analyzed.
authors.affiliation: Gifu Prefectural Research Institute for Health and Environmental Sciences, Gifu, Japan.
authors.forename: Tomiaki
authors.initials: T
authors.lastname: Minatani
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nagai
authors.forename: Masashi
authors.initials: M
authors.lastname: Nakamura
authors.forename: Kimihito
authors.initials: K
authors.lastname: Otsuka
authors.forename: Yoshimichi
authors.initials: Y
authors.lastname: Sakai
mesh_terms: D000273:Adipose Tissue / Q000737:chemistry; D000818:Animals; D002417:Cattle; D002588:Cesium Radioisotopes / Q000032:analysis*; D005507:Food Contamination, Radioactive / Q000032:analysis*; D005857:Germanium; D008460:Meat / Q000032:analysis*; D009132:Muscles / Q000737:chemistry; D012666:Semiconductors; D013051:Spectrometry, Gamma / Q000379:methods*
chemical_list: D002588:Cesium Radioisotopes; D005857:Germanium