Sarat Sahoo | National Institute of Radiological Sciences (original) (raw)

Papers by Sarat Sahoo

Research paper thumbnail of Extraction-chromatographic separation of thallium(III) from citrate media with a high relative molecular mass amine

Research paper thumbnail of High-precision measurement of 234U/238U ratio by thermal ionization mass spectrometer equipped with a WARP filter

Proceedings of the Japan Academy. Ser. B: Physical and Biological Sciences, 2000

Research paper thumbnail of Field Experience with Soil Gas Mapping Using Japanese Passive Radon/Thoron Discriminative Detectors for Comparing High and Low Radiation Areas in Serbia (Balkan Region)

Journal of Radiation Research, 2009

Based on results of fieldwork in the Balkan Region of Serbia from 2005 to 2007, soil gas radon an... more Based on results of fieldwork in the Balkan Region of Serbia from 2005 to 2007, soil gas radon and thoron concentrations as well as gamma dose rates were measured. Campaigns were conducted in two different geological regions: Niška Banja, considered a high natural radiation area, and Obrenovac around the TentB Thermal Power Plant (TPP), a low natural radiation area. Radon and thoron gas measurements were made by using two types of Japanese passive radon/thoron detectors, which included GPS data and gamma dose rates. The concentrations of soil radon gas in Niška Banja ranged from 1.8 to 161.1 kBq m -3 , whereas the concentrations for soil thoron gas ranged from 0.9 to 23.5 kBq m -3 . The gamma dose rates varied from 70 to 320 nGy h -1 . In the TentB area, radon concentration was found to range from 0.8 to 24.9 kBq m -3 and thoron from 0.6 to 1.9 kBq m -3 . The gamma dose rate ranged from 90 to 130 nGy h -1 . In addition, the natural radioactivity of the soil was investigated at the low background area. The radium and thorium contents in collected soil samples ranged from 23 to 58 and 33 to 67 Bq kg -1 , respectively. As a result of correlation analyses between the measured values, the highest correlation coefficient (R > 0.95) was found for thorium in the soil and the thoron gas concentration.

Research paper thumbnail of Concentrations of uranium and ratios in soil and plant samples collected around the uranium conversion building in the JCO campus

Journal of Environmental Radioactivity, 2000

In order to assess possible contamination by U in the JCO campus following the criticality accide... more In order to assess possible contamination by U in the JCO campus following the criticality accident, 10 soil samples and 15 plant samples were collected around the uranium conversion building. Uranium concentrations and isotopic compositions (235U/238U ratio) were determined by ICP-MS. Concentrations of Th in soil were also determined for comparison. Concentrations of U in soils were comparable to the

Research paper thumbnail of Gamma-dose rates from terrestrial and Chernobyl radionuclides inside and outside settlements in the Bryansk Region, Russia in 1996–2003

Journal of Environmental Radioactivity, 2006

In order to estimate current external gamma doses to the population of the Russian territories co... more In order to estimate current external gamma doses to the population of the Russian territories contaminated as a result of the Chernobyl accident, absorbed gamma-dose rates in air (DR) were determined at typical urban and suburban locations. The study was performed in the western districts of the Bryansk Region within the areas of 30 settlements (28 villages and 2 towns) with the initial levels of 137Cs deposition ranging from 13 to 4340 kBq m−2. In the towns, the living areas considered were private one-story wooden and stone houses. DR values were derived from in situ measurements performed with the help of gamma-dosimeters and gamma-spectrometers as well as from the results of soil samples analysis. In the areas under study, the values of DR from terrestrial radionuclides were 25 ± 6, 24 ± 5, 50 ± 10, 32 ± 6, 54 ± 11, 24 ± 8, 20 ± 6, 25 ± 8, and 18 ± 5 nGy h−1 at locations of kitchen gardens, dirt surfaces, asphalt surfaces, wooden houses, stone houses, grasslands inside settlement, grasslands outside settlement, ploughed fields, and forests, respectively. In 1996–2001, mean normalized (per MBq m−2 of 137Cs current inventory in soil) values of DR from 137Cs were 0.41 ± 0.07, 0.26 ± 0.13, 0.15 ± 0.07, 0.10 ± 0.05, 0.05 ± 0.04, 0.48 ± 0.12, 1.04 ± 0.22, 0.37 ± 0.07, and 1.15 ± 0.19 μGy h−1 at the locations of kitchen gardens, dirt surfaces, asphalt surfaces, wooden houses, stone houses, grasslands inside settlement, grasslands outside settlement, ploughed fields, and forests, respectively. The radiometric data from this work and the values of occupancy factors determined for the Russian population by others were used for the assessments of annual effective doses to three selected groups of rural population. The normalized (per MBq m−2137Cs current ground deposition) external effective doses to adults from 137Cs ranged from 0.66 to 2.27 mSv y−1 in the years 1996–2001, in accordance with professional activities and structures of living areas. For the areas under study, the average external effective doses from 137Cs were estimated to be in the range of 0.39–1.34 mSv y−1 in 2001. The average external effective doses from natural radionuclides appeared to be lower than those from the Chernobyl fallout ranging from 0.15 to 0.27 mSv y−1.

Research paper thumbnail of DOI 10.1007/s10967-014-3649-1 Measurement of 90Sr in soil samples affected by the Fukushima

90 Sr activity concentration was measured in four soil samples (0-10 cm) collected from the exclu... more 90 Sr activity concentration was measured in four soil samples (0-10 cm) collected from the exclusion zone around the Fukushima Daiichi Nuclear Power Plant.

Research paper thumbnail of Extraction-chromatographic separation of thallium(III) from citrate media with a high relative molecular mass amine

Research paper thumbnail of High-precision measurement of 234U/238U ratio by thermal ionization mass spectrometer equipped with a WARP filter

Proceedings of the Japan Academy. Ser. B: Physical and Biological Sciences, 2000

Research paper thumbnail of Field Experience with Soil Gas Mapping Using Japanese Passive Radon/Thoron Discriminative Detectors for Comparing High and Low Radiation Areas in Serbia (Balkan Region)

Journal of Radiation Research, 2009

Based on results of fieldwork in the Balkan Region of Serbia from 2005 to 2007, soil gas radon an... more Based on results of fieldwork in the Balkan Region of Serbia from 2005 to 2007, soil gas radon and thoron concentrations as well as gamma dose rates were measured. Campaigns were conducted in two different geological regions: Niška Banja, considered a high natural radiation area, and Obrenovac around the TentB Thermal Power Plant (TPP), a low natural radiation area. Radon and thoron gas measurements were made by using two types of Japanese passive radon/thoron detectors, which included GPS data and gamma dose rates. The concentrations of soil radon gas in Niška Banja ranged from 1.8 to 161.1 kBq m -3 , whereas the concentrations for soil thoron gas ranged from 0.9 to 23.5 kBq m -3 . The gamma dose rates varied from 70 to 320 nGy h -1 . In the TentB area, radon concentration was found to range from 0.8 to 24.9 kBq m -3 and thoron from 0.6 to 1.9 kBq m -3 . The gamma dose rate ranged from 90 to 130 nGy h -1 . In addition, the natural radioactivity of the soil was investigated at the low background area. The radium and thorium contents in collected soil samples ranged from 23 to 58 and 33 to 67 Bq kg -1 , respectively. As a result of correlation analyses between the measured values, the highest correlation coefficient (R > 0.95) was found for thorium in the soil and the thoron gas concentration.

Research paper thumbnail of Concentrations of uranium and ratios in soil and plant samples collected around the uranium conversion building in the JCO campus

Journal of Environmental Radioactivity, 2000

In order to assess possible contamination by U in the JCO campus following the criticality accide... more In order to assess possible contamination by U in the JCO campus following the criticality accident, 10 soil samples and 15 plant samples were collected around the uranium conversion building. Uranium concentrations and isotopic compositions (235U/238U ratio) were determined by ICP-MS. Concentrations of Th in soil were also determined for comparison. Concentrations of U in soils were comparable to the

Research paper thumbnail of Gamma-dose rates from terrestrial and Chernobyl radionuclides inside and outside settlements in the Bryansk Region, Russia in 1996–2003

Journal of Environmental Radioactivity, 2006

In order to estimate current external gamma doses to the population of the Russian territories co... more In order to estimate current external gamma doses to the population of the Russian territories contaminated as a result of the Chernobyl accident, absorbed gamma-dose rates in air (DR) were determined at typical urban and suburban locations. The study was performed in the western districts of the Bryansk Region within the areas of 30 settlements (28 villages and 2 towns) with the initial levels of 137Cs deposition ranging from 13 to 4340 kBq m−2. In the towns, the living areas considered were private one-story wooden and stone houses. DR values were derived from in situ measurements performed with the help of gamma-dosimeters and gamma-spectrometers as well as from the results of soil samples analysis. In the areas under study, the values of DR from terrestrial radionuclides were 25 ± 6, 24 ± 5, 50 ± 10, 32 ± 6, 54 ± 11, 24 ± 8, 20 ± 6, 25 ± 8, and 18 ± 5 nGy h−1 at locations of kitchen gardens, dirt surfaces, asphalt surfaces, wooden houses, stone houses, grasslands inside settlement, grasslands outside settlement, ploughed fields, and forests, respectively. In 1996–2001, mean normalized (per MBq m−2 of 137Cs current inventory in soil) values of DR from 137Cs were 0.41 ± 0.07, 0.26 ± 0.13, 0.15 ± 0.07, 0.10 ± 0.05, 0.05 ± 0.04, 0.48 ± 0.12, 1.04 ± 0.22, 0.37 ± 0.07, and 1.15 ± 0.19 μGy h−1 at the locations of kitchen gardens, dirt surfaces, asphalt surfaces, wooden houses, stone houses, grasslands inside settlement, grasslands outside settlement, ploughed fields, and forests, respectively. The radiometric data from this work and the values of occupancy factors determined for the Russian population by others were used for the assessments of annual effective doses to three selected groups of rural population. The normalized (per MBq m−2137Cs current ground deposition) external effective doses to adults from 137Cs ranged from 0.66 to 2.27 mSv y−1 in the years 1996–2001, in accordance with professional activities and structures of living areas. For the areas under study, the average external effective doses from 137Cs were estimated to be in the range of 0.39–1.34 mSv y−1 in 2001. The average external effective doses from natural radionuclides appeared to be lower than those from the Chernobyl fallout ranging from 0.15 to 0.27 mSv y−1.

Research paper thumbnail of DOI 10.1007/s10967-014-3649-1 Measurement of 90Sr in soil samples affected by the Fukushima

90 Sr activity concentration was measured in four soil samples (0-10 cm) collected from the exclu... more 90 Sr activity concentration was measured in four soil samples (0-10 cm) collected from the exclusion zone around the Fukushima Daiichi Nuclear Power Plant.