用HPGeγ谱仪不破坏地直接测定了采自东太平洋的 2 0个多金属结核样品 ,样品中可探测到的核素有2 38U ,2 30 Th ,2 2 6 Ra ,2 10 Pb ,2 2 8Ra ,2 2 8Th ,2 35 U ,2 2 7Ac(或2 31Pa)和40 K .对样品顶侧和底侧分别面对探测器的计数率和计数率比进行了分析 ,获得了其所蕴含的多金属结核生长、运动、放射性核素来源及其与环境关系的信息 .提出了判断多金属结核顶、底侧的新方法 .并根据顶、底侧2 30 Th计数率比推测多金属结核不同的滚动时间 . With the HPGe gamma spectrometer, 20 polymetallic nodules collected from the East Pacific Ocean were determined directly and destructively. The nuclides detectable in this sample are 2 38U, 2 30 Th, 2 2 6 Ra, 2 10 Pb, 2 2 8Ra, 2 2 8Th, 2 35 U, 2 2 7Ac (or 2 31Pa) and 40 K. The counting rates and counting rate ratios of the detectors facing the top and bottom sides of the sample were respectively analyzed, , The source of radionuclides and their relationship with environment, a new method for judging the top and bottom of polymetallic nodules was put forward.According to the top-bottom 2 30 Th count rate ratio, it was estimated that polymetallic nodules Different scroll time.