摘要目的 检测日本福岛核事故期间北京某菜园露天菠菜及菜园土壤中人工放射性核素的含量,研究其放射性污染特点.方法 连续采集该菜园的露天菠菜样品6份,土壤样品3份,采用高纯锗(HPGe)γ能谱仪分析样品中131Ⅰ等人工放射性核素的活度浓度.结果 在6份露天菠菜样品中均检测到131Ⅰ,在3份土壤样品中均检测到137Cs,仅有1份无菠菜遮挡的表层土壤样品中检测出微量的131Ⅰ.结论 福岛核事故后,北京的露天菠菜受到人工放射性核素131Ⅰ的污染,污染的峰值出现在2011年4月4日前后,但其污染较轻,不会对人体健康造成危害.

abstractsObjective To detect artificial radionuclide content in the spinach and soil in open air vegetable garden in Beijing during Fukushima nuclear accident and to study the radioactive contamination characteristics of the samples.Methods 6 spinach samples and 3 soil samples in open air vegetable garden were obtained through continuously sampling.High-purity germanium (HPGe) γ spectrometry was used to analyze activity concentrations of artificial radionuclide131 Ⅰ etc in these samples.Results Artificial radionuclide 131Ⅰ was detected in the 6 open air spinach samples.Artificial radionuclide 137Cs was detected in 3 vegetable garden soil samples,trace amount of 131 Ⅰ was detected in 1 open-air surface soil sample alone.Conclusions Following the Fukushima nuclear accident,spinach in Beijing's open-air vegetable garden was slightly polluted by artificial radionuclide 131 Ⅰ,with the highest values of pollution appeared around April 4,2011,but it could not cause harm to human health.