Assessment of Radiological Hazards of Sedimentary, Igneous and Sediments Natural Rocks  

作　　者：Wafaa Arafa Hala Mahmoud Eman Yousf Ashry Ashry Ibrahim Elaassy Ahmed Elsersy Wafaa Arafa;Hala Mahmoud;Eman Yousf;Ashry Ashry;Ibrahim Elaassy;Ahmed Elsersy(Faculty of Women, Ain Shams University, Cairo, Egypt;Nuclear Material Authority, Cairo, Egypt;Faculty of Education, Ain Shams University, Cairo, Egypt;National Institute of Standard, Giza, Egypt)

机构地区：[1]Faculty of Women, Ain Shams University, Cairo, Egypt [2]Nuclear Material Authority, Cairo, Egypt [3]Faculty of Education, Ain Shams University, Cairo, Egypt [4]National Institute of Standard, Giza, Egypt

出　　处：《World Journal of Nuclear Science and Technology》2024年第2期131-145,共15页核科学与技术国际期刊（英文）

摘　　要：Gamma-ray spectroscopy based on a 100% efficiency hyper-pure germanium detector was used to evaluate the activity concentrations of ²²⁶Ra, ²³²Th, and ⁴⁰K natural radionuclides in sedimentary, conglomerate, igneous and sedi-ments rock samples collected from four different locations in Eastern desert in Egypt. The obtained activity concentrations are used to evaluate the radi-ological hazards indices, absorbed dose rate, annual effective dose equivalent in air, radium equivalent, external and internal hazard index, radiation level index, annual gonadal dose equivalent, excess lifetime cancer risk and expo-sure rate. The results show that 1) the absorbed dose rate depends on the rock type, 2) the annual effective dose equivalent in air in 71% of sample below 20 mSvy^-1 (permissible limit for workers), 3) the conglomerate rocks show low radioactivity level, 4) sedimentary rocks are rich in radium while igneous rocks are rich in thorium and the sediments rocks are rich in both radium and thorium.Gamma-ray spectroscopy based on a 100% efficiency hyper-pure germanium detector was used to evaluate the activity concentrations of ²²⁶Ra, ²³²Th, and ⁴⁰K natural radionuclides in sedimentary, conglomerate, igneous and sedi-ments rock samples collected from four different locations in Eastern desert in Egypt. The obtained activity concentrations are used to evaluate the radi-ological hazards indices, absorbed dose rate, annual effective dose equivalent in air, radium equivalent, external and internal hazard index, radiation level index, annual gonadal dose equivalent, excess lifetime cancer risk and expo-sure rate. The results show that 1) the absorbed dose rate depends on the rock type, 2) the annual effective dose equivalent in air in 71% of sample below 20 mSvy^-1 (permissible limit for workers), 3) the conglomerate rocks show low radioactivity level, 4) sedimentary rocks are rich in radium while igneous rocks are rich in thorium and the sediments rocks are rich in both radium and thorium.

关 键 词：Gamma Spectrometry Radiological Hazard Indices NORM SEDIMENTARY CONGLOMERATE IGNEOUS SEDIMENTS 

分 类 号：P58[天文地球—岩石学]