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天然钍在自然界广泛存在,常与铁矿石,稀土矿伴生。内蒙地区富有铁矿石、稀土储量大、天然钍含量高,从而调查我区食品和饮水中天然钍含量,有实际意义。一、样品采集与预处理根据内蒙地区人口密度和当地居民的饮食习惯,采集当地当年有代表性的食品。粮食、蔬菜、肉类、鱼类(鱼、骨分开处理)等均取可食部分,洗净凉干,炭、灰化(450～500℃);牛奶蒸干直接炭、灰化。灰化好的样品过筛、编号、计算灰鲜比,备分析用。饮水酸化后保存。
Natural thorium exists widely in nature, often associated with iron ore, rare earth ore. Inner Mongolia is rich in iron ore, rare earth reserves, high natural thorium content in order to investigate the natural thorium content of food and drinking water in our area, of practical significance. First, the sample collection and pre-treatment According to the population density of Inner Mongolia and local residents eating habits, collecting the local representative of the year’s food. Edible part of food, vegetables, meat, fish (fish, bone separately) and so on are taken edible part, washed and dried, charcoal, ashing (450 ~ 500 ℃); Good sample of ashing sieved, numbered, calculated fresh ratio, for analysis. After acidification preservation.