227 Ac是制备219 Rn放射源的最佳母体。论文介绍了对从铀矿石中提取的227 Ac进行放射性纯度鉴定的方法。通过对219 Rn子体211 Pb的相对测量及219 Rn的干扰核素222 Rn、220 Rn的定量测量来鉴定产品227 Ac的放射性纯度，227 Ac产品中222 Rn、220 Rn的含量少于0．2％，227 Ac的放射性纯度能达到99．8％以上。%227 Ac is the most appropriate parent nuclide to produce a solid 219 Rn source.The paper describes methods to determinate the radiochemical purity of 227 Ac ext-rated from uranium ore .The radiochemical purity of 227 Ac is determined by relative measurement of 211 Pb and quantitative measurement of 222 Rn、220 Rn.The re-sults show that the content of 222 Rn、220 Rn in 227 Ac product is lower than 0.2%, and the radiochemical purity of 227 Ac is up to 99 .8%.
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