How can we calculate radon concentration in homes using Cr39?
Jorge Morales Pedraza
The CR-39 detectors are installed in various house rooms, typically in bedrooms and living rooms. These detectors are exposed to indoor radon for a certain period, often several months. After exposure, the detectors are retrieved and etched in a solution (like 6 M NaOH at 80°C for 16 hours) to reveal the alpha particle tracks. The observed track densities are then converted into indoor radon concentrations.
According to scienceinschool.org and other sources, the CR-39 detector is a passive alpha track detector used to measure home radon concentration. Here is how it works:
The conversion from track density to radon concentration is done using the following formula:
Rn=D/fc×Δt
Where:
- Rn is the radon concentration (Bq/m³)
- D is the track density (number of tracks/m²)
- fc is the calibration factor (the density of tracks corresponding to 1 Bq/m³ per exposure day; the manufacturer provides this information)
- Δt is the exposure time.
This method provides an average radon concentration over the exposure period. It’s also important to remember that radon levels can vary significantly over time due to ventilation, atmospheric pressure, and temperature.
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Chutima Krandrod
please follow this link for more informationArticle Importance of Discriminative Measurement for Radon Isotopes ...
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