Radon Testing

How radon testing works

Radon detectors are small, black, round capsules that can sit in the palm of your hand. Inside the detector is a plastic rectangle known as a CR-39 to which alpha particles impinge and leave microscopic tracks invisible to the naked eye.  The laboratory will process the CR-39 rectangle to enlarge the tracks and will place under a microscope where the tracks are counted.

Radon has peaks and troughs during the day and night and from month to month. For example, during the summer, windows and doors are more likely to be open thus creating an airflow which can reduce radon levels. In the winter however, a more air tight environment is created which can mean radon levels become more concentrated.

For this reason, results are given as weighted average measurements for domestic properties and annual maximum for workplaces with seasonal adjustments stipulated by the HPA applied dependent on the time of year the test was carried out.

The radon testing process

Following an initial discussion with a member of our team, the agreed number of radon testers, relative to the property size, will be dispatched in a sealed bag with each detector allocated a unique detector number.

The bag should only be opened when testing is ready to begin and until that time, detectors should be stored in a freezer.

Detectors will need to be placed in the most frequently used rooms, for example the living room and/or bedrooms and basement, at head height, not above a radiator or any other heating device. It is important to note down the testing start date, detector number and position and to save the bag for returning the detectors.

After the measurement period, the detectors need to be returned in the stamped addressed envelope provided. The laboratory will determine the radon concentration and the results will be passed to our Radon Specialist Surveying team who will provide a detailed report to confirm data and recommendations should any action be required.

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