The instrument allows the simultaneous activity concentration measurement of Radon (Rn222) and Thoron (Rn220) based on a diffusion-type measurement chamber.
The required fast exchange rate of sampled air is realized by a highly permeable chamber placed outside the instrument's enclosure. The relative Thoron sensitivity is comparable with one of the pump-based instruments.
The modified measurement chamber has been derived from the Radon Scout, while the electronics come from the RTM 1688-2. That means, more than 2 000 data records including a complete alpha spectrum can be stored. Of course, sensors for barometric pressure, temperature, and humidity are integrated too.
The Thoron Scout offers a larger Display compared with the Radon Scout. The replaceable batteries allow an autonomous operation of approximately one month. It is possible to operate the unit by mains power, resulting in unlimited sampling periods.
There is also a switch output that can be used for alert purposes or to control ventilation equipment.
The Radon gas monitor comes with the DAkkS-accredited calibration certificate according to the DIN EN ISO/IEC 17025:2018.
A standard calibration is performed at a radon concentration of 3 000 Bq/m³, with the prior determination of the background effect. A second calibration point at a radon concentration of 300 Bq/m³ is possible on demand and at additional cost. A separate calibration certificate is created for each calibration point.
