Radiation Protection Dosimetry Advance Access originally published online on September 5, 2005
Radiation Protection Dosimetry 2006 118(3):331-336; doi:10.1093/rpd/nci341
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Study on external exposure doses from terrestrial radioactivity in Southern Vietnam
Center for Nuclear Techniques, 217 Nguyen Trai Street, District 1, Ho Chi Minh city, Vietnam
* Corresponding author: hlchau{at}hcm.vnn.vn
Received May 17, 2005, amended July 12, 2005, accepted August 1, 2005
This paper presents the radioactivity concentrations of 226Ra, 232Th and 40K for 106 samples of surface soil collected in Southern Vietnam. The mean values of mass activity of radionuclides 226Ra, 232Th and 40K for Southern Vietnam are 28.6, 50.7 and 292.6 Bq kg1, respectively, which lead to the population-weighted absorbed dose rate of 54.5 nGy h1. The average annual effective doses outdoors, indoors and in total of Southern Vietnam are estimated to be 0.067, 0.374 and 0.441 mSv, respectively. The radium equivalent activity and the external hazard index of soil in Southern Vietnam are in the range 23.2254.1 Bq kg1 and 0.060.69, respectively.
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