Estimation of radiation hazard indices from natural radioactivity of some rocks  

作　　者：A.ABBADY N.K.AHMED A.M.EL-ARABI R.MICHEL A.H.EL-KAMEL A.G.E.ABBADY 

机构地区：[1]Physics Department, Faculty of Science Qena, South Valley University Egypt [2]Institute of the Radiation Protection and Radioecology,Hannover University Germany [3]Physics Department, Faculty of Science, Assiut University Egypt

出　　处：《Nuclear Science and Techniques》2006年第2期118-122,共5页核技术（英文）

摘　　要：Different samples of igneous and metamorphic rocks from Egypt and Germany have been considered to measure γ-ray activity concentrations due to naturally occurring, potentially hazardous radonuclides 226Ra, 232Th and 40K. The radiation hazard parameters including radiation equivalent activity, gamma-absorbed dose rate, and exter- nal and internal hazard indices have been estimated. The gamma-absorbed dose rates in air of rocks in Egypt range from 4.2 to 128.5 nGy·h-1 with a mean value of 55.3 nGy·h-1. For igneous and metamorphic rocks from Germany, the values of absorbed dose rates fluctuate from 5.1 to 148.6 nGy·h-1, with a mean value of 60.9 nGy·h-1. Generally, it is found that the radiation hazard indices in common igneous rocks are distinctly higher in acidic than in ultrabasic rocks. The results are discussed and compared with the corresponding published data.Different samples of igneous and metamorphic rocks from Egypt and Germany have been considered to measure γ-ray activity concentrations due to naturally occurring, potentially hazardous radonuclides ^226Ra, ^232Th and ^40K. The radiation hazard parameters including radiation equivalent activity, gamma-absorbed dose rate, and external and internal hazard indices have been estimated. The gamma-absorbed dose rates in air of rocks in Egypt range from 4.2 to 128.5 nGy·h^-1 with a mean value of 55.3 nGy·h^-1. For igneous and metamorphic rocks from Germany, the values of absorbed dose rates fluctuate from 5.1 to 148.6 nGy·h^-1, with a mean value of 60.9 nGy·h^-1. Generally, it is found that the radiation hazard indices in common igneous rocks are distinctly higher in acidic than in ultrabasic rocks. The results are discussed and compared with the corresponding published data.

关 键 词：自然放射性 岩石 变质岩 环境放射学 

分 类 号：X125[环境科学与工程—环境科学] TL817.2[核科学技术—核技术及应用]