Nabeshi Hiromi, Imamura Masataka, Tsutsumi Tomoaki, Maeda Tomomi, Hachisuka Akiko, Akiyama Hiroshi
Division of Foods, National Institute of Health Sciences, 3-25-26 Tonomachi, Kawasaki-ku, Kawasaki, Kanagawa 210-9501, Japan.
Division of Biochemistry, National Institute of Health Sciences, 3-25-26 Tonomachi, Kawasaki-ku, Kawasaki, Kanagawa 210-9501, Japan.
Food Saf (Tokyo). 2022 Mar 8;10(1):1-12. doi: 10.14252/foodsafetyfscj.D-21-00011. eCollection 2022 Mar.
We investigated the concentration of radioactive cesium (r-Cs: Cs and Cs) in commercially-available foods to confirm the effectiveness of pre-shipment radioactive material inspections mainly conducted by local governments. We focused on selected production areas and foods with high probability of r-Cs detection. To this end, we evaluated 715, 685, and 683 samples using scintillation spectrometer and high-purity germanium γ-spectrometer in fiscal years 2017, 2018, and 2019, respectively. The results accounted for 9 samples (1.3%), 10 samples (1.5%), and 5 samples (0.7%) for each fiscal year exceeded the standard limit of radioactive material (100 Bq/kg as r-Cs concentration for general foods). Although we selected and evaluated foods with high probability of r-Cs detection, percentage of samples exceeding the standard limit in each fiscal year was very low, less than 2% to be exact. This suggests that food management system, including pre-shipment inspections, were effectively functioning. In addition, samples exceeding the standard limit were bound to edible wild plants and wild mushrooms, and log-cultivated mushrooms. The former is consider to be difficult for cultivation/feeding control, and the latter was know to be parts of foods greatly affected by radioactive materials. This suggests that the concentration of r-Cs in these items remains at relatively high levels. In contrast, r-Cs was not detected in items with controalble cultivation/feeding. Based on these observations, it is better to be inspected on more difficult-to-cotrol cultivation/feeding items, in order to achieve further streamlining and improving of inspection efficiency. Our results indicate that r-Cs concentration in commercially-available foods of easy-to cultivation/feeding control, such as general vegetables, fruits, and meat, have been well-controlled in Japan, however, difficult-to-cultivation/feeding control items need to be more paid attention to r-Cs concentrations.
我们调查了市售食品中放射性铯（r-Cs：¹³⁴Cs和¹³⁷Cs）的浓度，以确认主要由地方政府进行的装运前放射性物质检查的有效性。我们重点关注了选定的、r-Cs检测可能性高的生产地区和食品。为此，我们在2017财年、2018财年和2019财年分别使用闪烁光谱仪和高纯锗γ光谱仪对715份、685份和683份样品进行了评估。各财年分别有9份样品（1.3%）、10份样品（1.5%）和5份样品（0.7%）超过了放射性物质的标准限值（一般食品的r-Cs浓度为100 Bq/kg）。尽管我们选择并评估了r-Cs检测可能性高的食品，但各财年超过标准限值的样品百分比非常低，确切地说不到2%。这表明包括装运前检查在内的食品管理系统有效运行。此外，超过标准限值的样品仅限于可食用野生植物、野生蘑菇和原木栽培蘑菇。前者被认为难以进行种植/饲养控制，后者已知是受放射性物质影响较大的食品部分。这表明这些物品中的r-Cs浓度仍处于相对较高水平。相比之下，在可控制种植/饲养的物品中未检测到r-Cs。基于这些观察结果，为了进一步简化和提高检查效率，最好对更难控制种植/饲养的物品进行检查。我们的结果表明，在日本，易于种植/饲养控制的市售食品，如一般蔬菜、水果和肉类中的r-Cs浓度得到了很好的控制，然而，难控制种植/饲养的物品需要更多地关注r-Cs浓度。
