Yadav Manjulata, Rawat Mukesh, Dangwal Anoop, Prasad Mukesh, Gusain G S, Ramola R C
Department of Physics, H.N.B. Garhwal University, Badshahi Thaul Campus, Tehri Garhwal 249 199, India
Department of Physics, H.N.B. Garhwal University, Badshahi Thaul Campus, Tehri Garhwal 249 199, India.
Radiat Prot Dosimetry. 2015 Nov;167(1-3):215-8. doi: 10.1093/rpd/ncv247. Epub 2015 May 1.
Naturally occurring radioactive materials are widely spread in the earth's environment, being distributed in soil, rocks, water, air, plants and even within the human body. All of these sources have contributed to an increase in the levels of environmental radioactivity and population radiation doses. This paper presents the activity level due to the presence of (226)Ra, (232)Th and (40)K in soil samples of Purola area in Garhwal Himalaya region. The measured activity of (226)Ra, (232)Th and (40)K in collected soil samples of Purola was found to vary from 13±10 to 55±10 Bq kg(-1) with an average of 31±2 Bq kg(-1), 13±10 to 101±13 Bq kg(-1) with an average 30±3 Bq kg(-1) and 150±81 to 1310±154 Bq kg(-1) with an average 583±30 Bq kg(-1), respectively. The radium equivalent activity in collected soil samples was found to vary from 47 to 221 Bq kg(-1) with an average of 115 Bq kg(-1). The total absorbed gamma dose rate in this area was found to vary from 22 to 93 nGy h(-1) with an average of 55 nGy h(-1). The distribution of these radionuclides in the soil of study area is discussed in details.
天然存在的放射性物质广泛分布于地球环境中，存在于土壤、岩石、水、空气、植物甚至人体内部。所有这些来源都导致了环境放射性水平和人群辐射剂量的增加。本文介绍了加瓦尔喜马拉雅地区普罗拉地区土壤样品中（226）镭、（232）钍和（40）钾所致的活度水平。在普罗拉采集的土壤样品中，（226）镭、（232）钍和（40）钾的测量活度分别在13±10至55±10贝克勒尔每千克之间变化，平均为31±2贝克勒尔每千克；在13±10至101±13贝克勒尔每千克之间变化，平均为30±3贝克勒尔每千克；在150±81至1310±154贝克勒尔每千克之间变化，平均为583±30贝克勒尔每千克。在所采集土壤样品中，镭当量活度在47至221贝克勒尔每千克之间变化，平均为115贝克勒尔每千克。该地区的总吸收伽马剂量率在22至93纳戈瑞每小时之间变化，平均为55纳戈瑞每小时。详细讨论了这些放射性核素在研究区域土壤中的分布情况。
