Huang Wei-Hsiang, Liu Yung-Yu, Lin Sheng-Chi, Yeh Yi-Lung, Chen Ting-Chien
Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan.
Hydrotech Research Institute, National Taiwan University, Taipei 10673, Taiwan.
Radiat Prot Dosimetry. 2023 Mar 17;199(4):312-317. doi: 10.1093/rpd/ncac276.
This study investigated natural gamma emitting radionuclides 40K and 226Ra in rice consumed in Taiwan. Thirty rice samples, collected from local markets, included 24 local rice and 6 imported rice samples. Radionuclide activities were 24.05 ± 10.21 and 0.62 ± 0.61 Bq/kg for 40Kand 226Ra for all rice samples. The activity of each radionuclide was insignificantly different for local and imported samples (p = 0.33 and 0.52 for 40K and 226Ra, respectively). The annual effective doses from rice consumption were estimated to be 6.80 ± 2.89 and 7.86 ± 7.81 μSv/y for 40K and 226Ra, respectively, and the sum ingestion dose of 226Ra and 40K was 14.66 ± 8.57 μSv/y. These values were one order of magnitude less than the 290 μSv/y world average of the ingestion exposure from natural sources. The results suggest that rice consumption in Taiwan is radiologically safe for the investigated radionuclides.
本研究调查了台湾地区食用大米中的天然γ发射放射性核素40K和226Ra。从当地市场采集了30个大米样本，其中包括24个本地大米样本和6个进口大米样本。所有大米样本中40K和226Ra的放射性核素活度分别为24.05±10.21和0.62±0.61Bq/kg。本地和进口样本中各放射性核素的活度差异不显著（40K和226Ra的p值分别为0.33和0.52）。食用大米的年有效剂量估计40K和226Ra分别为6.80±2.89和7.86±7.81μSv/y，226Ra和40K的总摄入剂量为14.66±8.57μSv/y。这些值比天然来源摄入暴露的全球平均水平290μSv/y低一个数量级。结果表明，台湾地区食用大米对于所调查的放射性核素而言在辐射方面是安全的。
