Radium-226, 232Th, and 40K distribution in the environment of Kaiga of south west coast of India

Health Physics
N KarunakaraK Siddappa

Abstract

Systematic studies on gamma radiation level and the distribution of natural radionuclides were carried out under a pre-operational survey for the establishment of baseline data on background radiation level and the distribution of radio-nuclides in the environment of Kaiga, in the south west coast of India, where a nuclear power reactor of 235 MWe has just been commissioned. The external gamma absorbed dose rates prevailing in the region were measured using a portable plastic scintillometer. Soil samples from 18 stations were collected from depth intervals of 0-5, 5-10, and 10-25 cm and analyzed for their 226Ra, 232Th, and 40K activity concentrations by gamma spectrometry employing a 90 cc PGT HpGe detector coupled to an EG&G ORTEC 8K multichannel analyzer. The activity of 226Ra was found to vary between 15.5-61.2 Bq kg(-1) with a mean value of 31.3 Bq kg(-1), that of 232Th varies between 11.4-41.9 Bq kg(-1) with a mean value of 27.5 Bq kg(-1) and of 40K between 78.3-254.8 Bq kg(-1) with a mean value of 159.9 Bq kg(-1) in 0-5 cm soil profiles of the region. The contributions of 238U, 232Th, and 40K to the total gamma absorbed dose rate were 39.9%, 40.7%, and 16.0%, respectively. The gamma absorbed dose rate in air estimated usi...Continue Reading

Citations

May 23, 2008·Environmental Monitoring and Assessment·Deswyn G MarbaniangP Nongkynrih
Feb 8, 2003·Journal of Environmental Radioactivity·N KarunakaraK Siddappa
Jul 25, 2008·Radiation Protection Dosimetry·J A OyedeleI Davids
Aug 2, 2001·Health Physics·N KarunakaraK Siddappa
Feb 28, 2008·Health Physics·N G Shiva PrasadN Karunakara
May 10, 2012·Radiation Protection Dosimetry·Nima RostampourNaghi Jabari Vesal
Dec 3, 2003·Journal of Radiation Research·Daryoush Shahbazi-Gahrouei

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