福建牛头山火山口岩石中的放射性核素 |
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引用本文:周鹏,徐茂泉,刘广山.2005.福建牛头山火山口岩石中的放射性核素[J].地球学报,26(z1):224-227. |
DOI:10.3975/cagsb.2005.s1.73 |
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基金项目:国家自然科学基金项目(编号:40036010)资助 |
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中文摘要:用 HPGe-γ谱方法测定了在福建省牛头山火山口采集的岩石中的放射性核素 238U、210Pb、228Th、228Ra和 40K,样品有玄武岩和花岗岩,结果给出6种核素的比活度为1.6~94.7、LD为30.5 Bq/kg、LD为26.6 Bq/kg、3.3~106 Bq/kg、4.9~113 Bq/kg 和28~1267 Bq/kg,平均为13.5 Bq/kg、5.5 Bq/kg、8.9 Bq/kg、13.0 Bq/kg、16.1 Bq/kg和293 Bq/kg。按放射性核素含量水平可以将玄武岩样品分为两个组。第1组样品中6种核素的含量平均为21.0 Bq/kg、14.8 Bq/kg、14.7 Bq/kg、26.0 Bq/kg、29.8 Bq/kg 和 749 Bq/kg;第2组样品中6个核素含量平均为7.0 Bq/kg、2.0 Bq/kg、6.0 Bq/kg、4.9 Bq/kg、7.7 Bq/kg和142 Bq/kg;花岗岩中6种核素的含量平均为57.7 Bq/kg、19.0 Bq/kg、21.7 Bq/kg、67.4 Bq/kg 和 894 Bq/kg。含量水平为:花岗岩大于第1组玄武岩第一组玄武岩大于第2组玄武岩。 |
中文关键词:放射性核素 火山岩石 γ谱分析 牛头山 |
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Radionuclides in Volcanic Rocks from the Niutou Hill, Fujian Province |
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Abstract:The natural radionuclides in volcanic rocks from the Niutou Hill, Fujian Province, were measured by HPGe-γ spectroscopy. The samples include granite and basalt. The contents of 238U、210Pb、228Th、228Ra and 40K,in all samples are 1.6~94.7、LD~30.5 Bq/kg、LD~26.6 Bq/kg、3.3~106 Bq/kg、4.9~113 Bq/kg and 28~1267 Bq/kg respectively, and the mean values are 13.5 Bq/kg、5.5 Bq/kg、8.9 Bq/kg、13.0 Bq/kg、16.1 Bq/kg and 293 Bq/kg. There are two groups of basalt samples that have different radionuclide values. The average contents of the six nuclides in the first group of basalt samples are 21.0 Bq/kg、14.8 Bq/kg、14.7 Bq/kg、26.0 Bq/kg、29.8 Bq/kg and 749 Bq/kg, those in the second group of basalt samples are 7.0 Bq/kg、2.0 Bq/kg、6.0 Bq/kg、4.9 Bq/kg、7.7 Bq/kg and 142 Bq/kg, and those in granite are 57.7 Bq/kg、19.0 Bq/kg、21.7 Bq/kg、67.4 Bq/kg and 894 Bq/kg. The content level of 6 radinuchlides in samples is in order of granite rocks>the first group of basalt rocks >the second group of basal rocks. |
keywords:radionuclide volcanic rock γspectrum analysis Niutou Hill |
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