作者提出的外环境和生物材料中锶~(90)、镭~(226)和铯~(137)的联合测定方法如下: 食品,生物材料(12—16升奶,8—10公斤肉,0.5—1公斤骨组织等)烤干后,灰化至呈灰白色,反复用浓硝酸浸取,分离残渣。试样溶液用硫酸钡共沉淀镭~(226),Ba(ra)SO_4沉淀跟饱和碳酸钠溶液和氢氧化铵一道煮沸转变为碳酸盐。后者溶于2N盐酸溶液,倒入封闭管,经过一个月达平衡后测定。 The combined determination of strontium ~ (90), radium ~ 226, and cesium ~ 137 in the external environment and biomaterials proposed by the authors is as follows: food, biological material (12-16 liters milk, 8-10 kg meat, 0.5 -1 kg of bone tissue, etc.) After roasting, ashing to gray, repeatedly leaching with concentrated nitric acid, the residue was separated. The sample solution was co-precipitated with barium sulphate, and the precipitate of Ba (ra) SO 4 was converted to carbonate by boiling with saturated sodium carbonate solution and ammonium hydroxide. The latter was dissolved in 2N hydrochloric acid solution, poured into a closed tube, measured after a month up to balance.