Natural radioactivity content in soil and indoor air of Chellanam

Contribution of terrestrial radiation due to the presence of naturally occurring radionuclides in soil and air constitutes a significant component of the background radiation exposure to the population. The concentrations of natural radionuclides in the soil and indoor air of Chellanam were investig...

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Veröffentlicht in:Radiation protection dosimetry 2012-11, Vol.152 (1-3), p.80-83
Hauptverfasser: Mathew, S, Rajagopalan, M, Abraham, J P, Balakrishnan, D, Umadevi, A G
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container_issue 1-3
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creator Mathew, S
Rajagopalan, M
Abraham, J P
Balakrishnan, D
Umadevi, A G
description Contribution of terrestrial radiation due to the presence of naturally occurring radionuclides in soil and air constitutes a significant component of the background radiation exposure to the population. The concentrations of natural radionuclides in the soil and indoor air of Chellanam were investigated with an aim of evaluating the environmental radioactivity level and radiation hazard to the population. Chellanam is in the suburbs of Cochin, with the Arabian Sea in the west and the Cochin backwaters in the east. Chellanam is situated at ∼25 km from the sites of these factories. The data obtained serve as a reference in documenting changes to the environmental radioactivity due to technical activities. Soil samples were collected from 30 locations of the study area. The activity concentrations of (232)Th, (238)U and (40)K in the samples were analysed using gamma spectrometry. The gamma dose rates were calculated using conversion factors recommended by UNSCEAR [United Nations Scientific Committee on the Effects of Atomic Radiation. Sources and effects of ionizing radiation. UNSCEAR (2000)]. The ambient radiation exposure rates measured in the area ranged from 74 to 195 nGy h(-1) with a mean value of 131 nGy h(-1). The significant radionuclides being (232)Th, (238)U and (40)K, their activities were used to arrive at the absorbed gamma dose rate with a mean value of 131 nGy h(-1) and the radium equivalent activity with a mean value of 162 Bq kg(-1). The radon progeny levels varied from 0.21 to 1.4 mWL with a mean value of 0.6 mWL. The thoron progeny varied from 0.34 to 2.9 mWL with a mean value of 0.85 mWL. The ratio between thoron and radon progenies varied from 1.4 to 2.3 with a mean of 1.6. The details of the study, analysis and results are discussed.
doi_str_mv 10.1093/rpd/ncs193
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The concentrations of natural radionuclides in the soil and indoor air of Chellanam were investigated with an aim of evaluating the environmental radioactivity level and radiation hazard to the population. Chellanam is in the suburbs of Cochin, with the Arabian Sea in the west and the Cochin backwaters in the east. Chellanam is situated at ∼25 km from the sites of these factories. The data obtained serve as a reference in documenting changes to the environmental radioactivity due to technical activities. Soil samples were collected from 30 locations of the study area. The activity concentrations of (232)Th, (238)U and (40)K in the samples were analysed using gamma spectrometry. The gamma dose rates were calculated using conversion factors recommended by UNSCEAR [United Nations Scientific Committee on the Effects of Atomic Radiation. Sources and effects of ionizing radiation. UNSCEAR (2000)]. 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source MEDLINE; Oxford University Press Journals All Titles (1996-Current); Alma/SFX Local Collection
subjects Air Pollutants, Radioactive - analysis
Air Pollution, Indoor - analysis
Background Radiation
Calibration
India
Potassium Radioisotopes - analysis
Radiation Monitoring - methods
Radioactivity
Radioisotopes - analysis
Radiometry - methods
Radium - analysis
Radon - analysis
Silicon Dioxide
Soil
Soil Pollutants, Radioactive - analysis
Spectrometry, Gamma - methods
Thorium - analysis
Uranium - analysis
title Natural radioactivity content in soil and indoor air of Chellanam
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