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ANNUAL EFFECTIVE DOSE ASSESSMENT DUE TO RADON AND THORON PROGENIES IN DWELLINGS OF KILIMAMBOGO, KENYA.

C Nyambura1, S Tokonami2, N O Hashim1

  • 1Physics Department, Kenyatta University, Nairobi, Kenya.

Radiation Protection Dosimetry
|April 30, 2019
PubMed
Summary
This summary is machine-generated.

Indoor radon and thoron levels were measured in Kenyan houses. Stone-walled homes had the highest radon, while mud-walled homes showed the highest thoron, indicating varying radiation exposure risks.

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Area of Science:

  • Environmental Science
  • Radiation Physics
  • Public Health

Background:

  • Human exposure to ionizing radiation is continuous from natural and artificial sources.
  • Building materials like Uranium-238 and Thorium-232 are significant indoor sources of radon and thoron.
  • Understanding indoor radiation levels is crucial for public health risk assessment.

Purpose of the Study:

  • To quantify indoor radon, thoron, and thoron progeny concentrations in different dwelling types in Kilimambogo, Kenya.
  • To assess the annual effective radiation doses from radon and thoron in these environments.
  • To compare radiation exposure levels across mud-walled, metallic, and stone-walled houses.

Main Methods:

  • Utilized passive radon-thoron discriminative monitors (RADUET) for radon and thoron concentration measurements.
  • Employed thoron progeny monitors to determine equilibrium equivalent thoron concentration (EETC).
  • Conducted a 3-month measurement campaign in various modern house constructions.

Main Results:

  • Mean radon concentrations ranged from 60 ± 10 to 75 ± 10 Bq m-3 across dwelling types.
  • Mean thoron concentrations varied significantly, from 71 ± 24 to 195 ± 36 Bq m-3.
  • Annual effective doses from radon were 1.1-1.4 mSv y-1, while thoron doses ranged from 0.5-2.4 mSv y-1.

Conclusions:

  • Dwelling construction materials significantly influence indoor radon and thoron levels.
  • Mud-walled houses exhibited the highest thoron concentrations and associated effective doses.
  • Stone-walled houses showed the highest radon concentrations, necessitating further investigation into building material impacts on indoor radiation exposure.