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Articles by N Kavasi
Total Records ( 2 ) for N Kavasi
  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.

  N Kavasi , T Vigh , A Sorimachi , T Ishikawa , S Tokonami and M. Hosoda

In this study, short-term radon (RnDP) and thoron (TnDP) progeny measurements and dose estimation were carried out in winter and summer in a manganese mine, Hungary. Gamma-ray dose rate originating from external sources and 222Rn and 226Ra contents of spring-water from a mine was also measured. During working hours RnDP and TnDP concentration values changed between 12.1–175 and 0.14–0.42 Bq m–3, respectively. The 222Rn and 226Ra concentration values in the karst spring-water were ~6 Bq dm–3 and 16 mBq dm–3, respectively. The radiation dose resulting from the consumption of karst spring-water was negligible. The doses from the inhalation of TnDP and external gamma radiation were of the same magnitude, ~0.1 mSv y–1, which was rather negligible related to the estimated radiation dose of 5 mSv y–1 from RnDP.

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