本文结合已报道的U,Th分离方法和~(231)Pa分离条件建立了Th-Pa-U联合分离流程和测试技术,并用以分离测定一个锰结核和一个深海沉积物样品中的~(231)Pa,U和Th同位素含量的深度分布。用~(231)pa_(ex),~(230)Th_(ex)和~(230)Th_(ex)/~(232)Th法分别计算该锰结核的生长速率为1.5,0.9和1.5mm/Ma。U,Th和~(231)Pa的化学回收率(％)分别为40—80,80—92和60—86。 In this paper, a combined Th-Pa-U separation flow and test technique has been established based on the reported U and Th separation and ~ (231) Pa separation conditions and used for the separation and determination of ~ (231) in a manganese nodule and a deep sea sediment sample ) Depth distribution of Pa, U, and Th isotopic contents. The growth rates of Mn nodules were calculated to be 1.5, 0.9 and 1.5 mm / s using the ~ (231) pa_ (ex), ~ (230) Th ex and ~ (230) Th ex and ~ Ma. Chemical recoveries (%) for U, Th and ~ (231) Pa were 40-80, 80-92 and 60-86, respectively.