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Estimation of External Dose by Car-Borne Survey in Kerala, India

Author

Listed:
  • Masahiro Hosoda
  • Shinji Tokonami
  • Yasutaka Omori
  • Sarata Kumar Sahoo
  • Suminori Akiba
  • Atsuyuki Sorimachi
  • Tetsuo Ishikawa
  • Raghu Ram Nair
  • Padmavathy Amma Jayalekshmi
  • Paul Sebastian
  • Kazuki Iwaoka
  • Naofumi Akata
  • Hiromi Kudo

Abstract

A car-borne survey was carried out in Kerala, India to estimate external dose. Measurements were made with a 3-in × 3-in NaI(Tl) scintillation spectrometer from September 23 to 27, 2013. The routes were selected from 12 Panchayats in Karunagappally Taluk which were classified into high level, mid-level and low level high background radiation (HBR) areas. A heterogeneous distribution of air kerma rates was seen in the dose rate distribution map. The maximum air kerma rate, 2.1 μGy/h, was observed on a beach sand surface. 232Th activity concentration for the beach sand was higher than that for soil and grass surfaces, and the range of activity concentration was estimated to be 0.7–2.3 kBq/kg. The contribution of 232Th to air kerma rate was over 70% at the measurement points with values larger than 0.34 μGy/h. The maximum value of the annual effective dose in Karunagappally Taluk was observed around coastal areas, and it was estimated to be 13 mSv/y. More than 30% of all the annual effective doses obtained in this survey exceeded 1 mSv/y.

Suggested Citation

  • Masahiro Hosoda & Shinji Tokonami & Yasutaka Omori & Sarata Kumar Sahoo & Suminori Akiba & Atsuyuki Sorimachi & Tetsuo Ishikawa & Raghu Ram Nair & Padmavathy Amma Jayalekshmi & Paul Sebastian & Kazuki, 2015. "Estimation of External Dose by Car-Borne Survey in Kerala, India," PLOS ONE, Public Library of Science, vol. 10(4), pages 1-11, April.
    • Handle: RePEc:plo:pone00:0124433
    DOI: 10.1371/journal.pone.0124433
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