用1-苯基-3-甲基-4-苯甲酰基吡唑啉酮-5(PMBP)作萃取剂,234Th为示踪剂,对在HNO3介质中用PMBP-苯萃取钍的条件实验进行了研究。在条件实验的基础上提出了一个从中能18O离子照过的天然铀样品中简便、快速地分离钍的化学流程。钍样品的γ射线谱显示该流程能去除绝大多数产物元素，特别是U、Ce和I的沾污。%The experimental conditions for the extraction of thorium by using PMBP as extractant and 234Th as tracer in the nitric acid solution were investigated. Based on the experiments， a chemical procedure used for rapidly separating thorium from the natural uranium irradiated by 18O ions was developed. The γ spectrum of the thorium fraction shows that the most of the reaction products， especially U， Ce and I can be completely removed by using the procedure.
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