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Articles by S. K Sahoo
Total Records ( 7 ) for S. K Sahoo
  S. K Sahoo , S Mohapatra , A Chakrabarty , C. G Sumesh , V. N Jha , R. M Tripathi and V. D. Puranik

Exposure due to natural radiation is of particular importance because it accounts for the largest contribution (nearly 85 %) to the total collective dose of the world population. An attempt has been made to present the feasibility of uranium occurrence in drinking water samples from different states of India, by laser-induced fluorimetry. The associated age-dependent radiation dose was estimated by taking the prescribed water intake values of different age groups. The concentration of uranium obtained, i.e. 0.1 ± 0.01 to 19.6 ± 1.8 µg l–1, is well below the drinking water guideline value of 30 µg l–1. The annual ingestion dose due to uranium in drinking water for various age groups is found to vary from 0.14 to 48 µSv y–1.

  S. K Sahoo , S Mohapatra , N. K Sethy , A. C Patra , A. K Shukla , A. V Kumar , R. M Tripathi and V. D. Puranik

The specific activity and the gamma radiation dose rates due to naturally occurring radioactive materials (238U, 232Th and 40K) were determined in 26 roadside surface soils along Jamshedpur-Musabani road—a mineralised and mining region, using high-resolution gamma-ray spectrometry. The concentrations of 238U, 232Th and 40K in the soil samples were found to be in the range of 16.6 ± 0.6–390.5 ± 1.6, 24.1 ± 0.7–148.2 ± 2.1 and 85.9 ± 3.8–881.6 ± 22.4 Bq kg–1, respectively. The annual effective dose equivalent was found to be in the range of 0.04–0.32 mSv y–1 with an average value of 0.13 mSv y–1. The excess cancer risk is in the range of 0.16 x 10–3–1.22 x 10–3 with an average value of 0.49 x 10–3.

  Z. S Zunic , I Celikovic , S Tokonami , T Ishikawa , P Ujic , A Onischenko , M Zhukovsky , G Milic , B Jakupi , O Cuknic , N Veselinovic , K Fujimoto , S. K Sahoo and I. Yarmoshenko

This paper deals with the results of the first-field use in the Balkans, i.e. Serbia and Republic of Srpska (Bosnia and Hercegovina), of a passive polycarbonate Mark II type and poliallyldiglycol carbonate (Cr-39) alpha track detectors sensitive to thoron as well as to radon. Both types of solid state nuclear track detectors were designed and supplied by National Institute of Radiological Sciences (NIRS), Chiba, Japan. The commercial names for these detectors which all have been field tested in Balkan rural communities are known as: UFO and RADUET passive discriminative radon/thoron detectors. No database of thoron and thoron progeny concentrations in dwellings in Serbia or Balkans region exist, and as a result, the level of exposure of the Serbian population to thoron and its progeny is unknown so far.

  R. C Ramola , G Prasad , G. S Gusain , B. S Rautela , V. M Choubey , D. V Sagar , S Tokonami , A Sorimachi , S. K Sahoo , M Janik and T. Ishikawa

This paper presents the preliminary results of radon and thoron measurements in the houses of Chhatrapur area of southeastern coast of Orissa, India. This area is one of the high radiation background radiation areas in India, which consists of monazite sand as the source of thoron. Both active and passive methods were employed for the measurements. Radon and thoron concentrations were measured in the houses of Chhatrapur area using twin cup radon dosemeters, RAD7 and radon–thoron discriminative detector (Raduet). Thoron progeny concentration was also measured in the houses using deposition rate measurements. Radon and thoron concentrations in the houses of study area were found to vary from 8 to 47 Bq m–3 and the below detection level to 77 Bq m–3, respectively. While thoron progeny concentration in these houses ranges between 0.17 and 4.24 Bq m–3, preliminary investigation shows that the thoron concentration is higher than radon concentration in the houses of the study area. The thoron progeny concentration was found to be comparatively higher, which forms a base for further study in the area. The comparison between the results of various techniques is presented in this paper.

  S. K Sahoo , T Ishikawa , S Tokonami , A Sorimachi , C Kranrod , M Janik , M Hosoda , N. M Hassan , S Chanyotha , V. K Parami , H Yonehara and R. C. Ramola

Several industrial processes are known to enrich naturally occurring radioactive materials (NORM). To assess such processes with respect to their radiological relevance, characteristic parameters describing this enrichment will lead to interesting information useful to UNSCEAR. In case of mineral treatment plants, the high temperatures used in smelting and refining processes lead to high concentrations of 238U and 232Th. Also due to thermal power combustion, concentration of U and Th in the fly ash increases manifold. NORM samples were collected from a Thailand mineral treatment plant and Philippine coal-fired thermal power plants for investigation. Some studies are initiated from a high background radiation area near Gopalpur of Orissa state in India. These NORM samples were analysed by gamma-ray spectrometry as well as inductively coupled plasma mass spectrometry. The radioactivity in case of Orissa soil samples is found to be mainly contributed from thorium. This study attempts to evaluate levels of thorium activity in NORM samples.

  M Hosoda , S Tokonami , A Sorimachi , T Ishikawa , S. K Sahoo , M Furukawa , Y Shiroma , Y Yasuoka , M Janik , N Kavasi , S Uchida and M. Shimo

Field measurements of thoron exhalation rates have been carried out using a ZnS(Ag) scintillation detector with an accumulation chamber. The influence of soil surface temperature and moisture saturation on the thoron exhalation rate was observed. When the variation of moisture saturation was small, the soil surface temperature appeared to induce a strong effect on the thoron exhalation rate. On the other hand, when the variation of moisture saturation was large, the influence of moisture saturation appeared to be larger than the soil surface temperature. The number of data ranged over 405, and the median was estimated to be 0.79 Bq m–2 s–1. Dependence of geology on the thoron exhalation rate from the soil surface was obviously found, and a nationwide distribution map of the thoron exhalation rate from the soil surface was drawn by using these data. It was generally high in the southwest region than in the northeast region.

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