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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
Summary
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.
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.
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