Lopes J M, Garcêz R W D, Filgueiras R A, Silva A X, Braz D
Nuclear Engineering Program, Federal University of Rio de Janeiro, Av. Horácio Macedo, 2030, Bloco G, Sala 206-CT, Fundão, Rio de Janeiro, RJ, Brazil.
Polytechnic School, Federal University of Rio de Janeiro, Av. Athos da Silveira Ramos, 149-CT, Fundão, Rio de Janeiro, RJ, Brazil.
Radiat Prot Dosimetry. 2018 Oct 1;181(2):149-155. doi: 10.1093/rpd/ncx310.
Annual effective dose due to the consumption of 40K, 226Ra, 228Ra and 228Th was estimated from high-resolution gamma spectrometry, food consumption data for the inhabitants of Rio de Janeiro City and dose coefficients published by the ICRP 119. A total of 31 samples of cereals, grains, vegetables, flours, liquid and perishables were analyzed. 40K was measured in all samples, and bean sample presented highest specific concentration 489.36 ± 23.70 Bq kg-1. The highest specific concentration for 226Ra, 228Ra and 228Th was measured in pumpkin (7.82 ± 1.09 Bq kg-1), carrot (30.18 ± 1.99 Bq kg-1) and beet (2.43 ± 0.48 Bq kg-1), respectively. The highest contribution to annual effective dose came from beans (556.3 μSv), potato (12.5 μSv), carrot (10.3 μSv), banana (4.7 μSv) and beet (3.3 μSv). It was observed that updates of daily food consumption values was the main reason for an up to 10-fold difference between the annual effective dose found in the present study and literature data.
根据高分辨率伽马能谱法、里约热内卢市居民的食物消费数据以及国际辐射防护委员会（ICRP）第119号出版物公布的剂量系数，估算了因摄入40K、226Ra、228Ra和228Th而产生的年有效剂量。共分析了31份谷物、粮食、蔬菜、面粉、液体和易腐食品样本。所有样本均检测到了40K，豆类样本的比活度最高，为489.36±23.70 Bq/kg。226Ra、228Ra和228Th的最高比活度分别在南瓜（7.82±1.09 Bq/kg）、胡萝卜（30.18±1.99 Bq/kg）和甜菜（2.43±0.48 Bq/kg）中测得。对年有效剂量贡献最大的是豆类（556.3 μSv）、土豆（12.5 μSv）、胡萝卜（10.3 μSv）、香蕉（4.7 μSv）和甜菜（3.3 μSv）。据观察，日常食物消费值的更新是本研究中发现的年有效剂量与文献数据之间高达10倍差异的主要原因。
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