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Nationwide indoor 222Rn and 220Rn map for India: a review.
1Ex-Environmental Assessment Division, Bhabha Atomic Research Center, Mumbai-450 085, India.
This study mapped indoor radon (222Rn and 220Rn) levels across India using solid-state detectors. Radon (222Rn) was the primary dose contributor, but radon (220Rn) also significantly impacted inhalation doses.
Area of Science:
- Environmental Science
- Radiological Protection
- Public Health
Background:
- Radon (Rn) is a significant indoor air pollutant with epidemiological implications.
- Understanding indoor radon levels is crucial for assessing public health risks.
- Nationwide data on indoor radon isotopes (222Rn and 220Rn) in India were previously limited.
Purpose of the Study:
- To create a nationwide map of indoor radon (222Rn and 220Rn) concentrations in India.
- To estimate the annual inhalation dose rates from indoor radon and its progeny.
- To identify factors influencing indoor radon levels.
Main Methods:
- Utilized solid-state nuclear track detectors (SSNTDs) in twin-cup dosimeters for discriminating between 222Rn and 220Rn.
- Conducted over 5000 measurements in 1500 urban and non-urban dwellings across India.
- Measured indoor 222Rn, 220Rn, and their progeny levels.
Main Results:
- The geometric mean of the estimated annual inhalation dose rate from indoor radon and progeny was 0.94 mSvy⁻¹.
- Indoor 222Rn and its progeny constituted the major portion of the inhalation dose.
- Indoor 220Rn and its progeny contributed approximately 20% to the total indoor inhalation dose.
- Significant variations in indoor 222Rn levels were observed based on wall and flooring materials.
Conclusions:
- Nationwide indoor radon mapping provides essential data for public health risk assessment in India.
- Both 222Rn and 220Rn contribute to indoor inhalation doses, with 222Rn being dominant.
- Building materials significantly influence indoor radon concentrations, highlighting the need for material-specific mitigation strategies.
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