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为了探讨山东省栖霞县胃癌高死亡率与食物中微量元素的关系，用质子激发Ｘ射线荧光法（简称ＰＩＸＥ）测定该县和对照组（胃癌低发区）苍山县的面粉、玉米面和红薯中微量元素含量。结果表明：栖霞县三种食物中的镍含量非常显著地高于苍山县。提示高镍食物可能是导致胃癌高发的环境因素
To investigate the relationship between high mortality and trace elements in food in Qixia County of Shandong Province, the proton-excited X-ray fluorescence spectrometry (PIXE) was used to determine the flour, cornmeal and sweet potato in Cangshan County of the county and the control group (low incidence of gastric cancer). Trace element content. The results showed that the content of nickel in the three foods in Qixia County was significantly higher than that in Cangshan County. Tips that high-nickel foods may be an environmental factor leading to high incidence of gastric cancer