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Radon levels inside residences in Swaziland
M C Nsibande1, M Mahlobo, S M Farid
1Department of Physics, University of Swaziland, Africa.
The Science of the Total Environment
|July 18, 1994
Summary
Indoor radon levels were measured in 130 homes using solid-state nuclear track detectors (SSNTDs). Modern homes and apartments showed higher radon concentrations than traditional houses, with levels peaking in winter.
Area of Science:
- Environmental Science
- Radiation Detection
Background:
- Solid-state nuclear track detectors (SSNTDs) are effective for time-integrated environmental radiation monitoring.
- Indoor radon monitoring is crucial for assessing public health risks associated with radiation exposure.
Purpose of the Study:
- To quantify indoor radon levels in various housing types (traditional, modern, apartments).
- To investigate seasonal variations and vertical distribution of radon.
- To determine the contribution of soil gas to indoor radon concentrations.
Main Methods:
- Utilized SSNTDs for time-integrated measurements of radon concentrations.
- Conducted surveys across 130 dwellings during winter and summer seasons.
- Analyzed radon levels in relation to housing type, floor level, and season.
Main Results:
- Average radon levels: 62 Bq.m-3 (traditional houses), 125 Bq.m-3 (modern houses), 133 Bq.m-3 (apartments).
- Radon concentration decreased by over 300% from the ground to the second floor in apartments, indicating soil gas as a primary source.
- Winter radon levels were approximately 30% higher than summer levels.
Conclusions:
- Housing type and season significantly influence indoor radon levels.
- Soil gas intrusion is a major factor in elevated ground-floor radon concentrations.
- The study provides essential data for indoor radiation protection strategies.