• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国政府科技报告 >Application of Thermal and Epithermal Neutron Activation Analysis to Rock and Sediment Samples. Advantages of Matrix Preseparation for Rare Earth Element Determination
【24h】

Application of Thermal and Epithermal Neutron Activation Analysis to Rock and Sediment Samples. Advantages of Matrix Preseparation for Rare Earth Element Determination

机译：热和超热中子活化分析在岩石和沉积物样品中的应用。基质预分离对稀土元素测定的优势

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Neutron activation analysis (NAA) has been applied to the determination of several trace elements in rocks and in marine sediments. Epithermal neutron activation analysis (ENAA) has been shown to be useful in the analysis of rocks, because some strong activities limiting the instrumental determination of many elements are reduced. Some USGS geological reference materials have been activated by both thermal and epithermal neutrons, evaluating the experimental advantage factors of ENAA and comparing the obtained concentrations and the detection limits for both methods. ENAA is particularly useful to determine several elements, among which some of the rare earth elements (REE), whose importance in petrogenetic studies is well known. In the case of marine sediments, the REE are considered particularly important for simulating the chemical behaviour of the actinides in the environment. For this purpose, REE have been determined after a group separation from the matrix, in order reduce the complexity of the activation gamma-ray spectra. This separation step improves detection limits for all REE, allowing the determination of some of them not easily detected without a separation, like Nd, Gd, Tb and Tm. (ERA citation 11:048058)

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号