中文摘要：

目的考察电感耦合等离子体质谱技术（ICP-MS）表征铜精矿中天然核素的可行性。方法采用ICP-MS表征铜精矿中238U．232Th．226Ra和40K的含量，以此质量浓度数据代入理论公式算出比活度数据，再将此计算得到的比活度数据与3家不同实验室采用HPGeγ谱仪测量得到的比活度数据进行比对，评价ICP-Ms表征铜精矿中天然核素比活度的可行性。结果ICP-MS表征得到的比活度与HPGeγ谱仪测量得到的比活度相对误差在10％以内。结论采用ICP-MS对铜精矿中天然核素进行表征是可行的，ICP-MS技术可成为相关参考样品定值的方法之一。

英文摘要：

Objective To study the feasibility of measurement of 238U,232Th,226Ra and 40K in copper concentrates by ICP - MS technique. Methods ICP - MS was applied to characterize the concentration of 238U, 232Th, 226 Ra and 40K in copper con- centrates; the specific activity of natural nuclides were obtained by theoretical calculation using the concentration data, then HPGe γspectrometer was employed to characterize the specific activity of natural nuclides in the copper concentrates compared with the data of specific activity obtained by ICP - MS and HPGe γ spectrometer respectively, and the feasibility of measure- ment of 23SU,232Th,226Ra and 40K in copper concentrates by ICP - MS technique was judged. Results The relative error of specific activity by ICP - MS compared with HPGe 3, spectrometer technique was less than 10%. Conclusion Specific activity of natural nuclides in copper concentrates can be characterized by ICP - MS technique, and ICP - MS technique can be ap- plied to decide the value of the reference sample.