黄海五类典型海产食品中~(210)Po水平

对我国黄海海域典型水产品中~(210)Po的水平进行了调查研究。2016年在山东荣成和江苏连云港两个重要渔产区采样,用"三酸湿灰化法"、银片自沉积和半导体α谱仪分析测量了5大类22种典型可食用海产品中~(210)Po水平,探测下限为2.2×10~(-2) Bq/kg(鲜)。结果显示:不同海产品可食用部分中~(210)Po比活度范围为1.17×10~(-1)~6.58×10Bq/kg(鲜),总体上看贝类普遍高于15Bq/kg(鲜),其次是甲壳类均值为13.2Bq/kg(鲜);头足类、鱼类不同物种之间存在较大差异,但一般低于10Bq/kg(鲜);不同采集地海产品中~(210)Po水平存在明显差异。2016年秋季黄海各类海产品中~(210)Po水平(除头足类)高于UNSCEAR 2000年报告建议的全球代表性水平约1倍。与1977—1978年海产食品~(210)Po水平调查结果相比,本次调查~(210)Po水平总体略低。

210Po Level in Five Kinds of Typical Aquatic Products From the Yellow Sea of China

This paper focuses on the ²¹⁰Po level of typical aquatic products in China. In 2016, aquatic samples were collected in two of the most important fishery area along the Yellow Sea coastal, Rongcheng of Shandong province and Lianyungang of Jiangsu province. ²¹⁰Po in 22 typical seafood species of 5 categories were analyzed and measured by the method of acid wet ashing and PIPS alpha spectrometer, whose detection limit was 2.2×10^-2 Bq/kg fresh weight. The results show that ²¹⁰Po level of the various seafood edible part ranges 1.17×10^-1 -6.58×10 Bq/kg fresh weight, generally the highest for shellfish and followed by crustaceans, whereas there are big differences between specific species of cephalopods, fish and algae, generally less than 10 Bq/kg fresh weight. There is a certain difference of the ²¹⁰Po level in the samples from different sites, as Rongcheng indicates higher than that in Lianyungang. The ²¹⁰Po concentrations in all kinds of seafood (except cephalopods) from the Yellow Sea in 2016 autumn are one time higher than those of global representative concentrations reported by UNSCEAR 2000. Compared with the results of seafood radionuclides survey in 1977-1978, ²¹⁰Po level in the Yellow Sea seafood samples is somewhat lower in this investigation.