For long-term radon measurements, we use Radtrak3® passive detectors based on alpha-track (CR-39) technology.
This is a proven, reliable, and highly accurate method for measuring indoor radon concentrations, widely used by accredited institutions worldwide.

🔬 How the detector works

Radon is a naturally occurring radioactive gas that emits alpha particles when it decays.
Inside the detector, these alpha particles strike a special plastic film made of CR-39 (polyallyl diglycol carbonate), leaving microscopic tracks.
After the exposure period (typically 60–90 days, according to the manufacturer’s recommended range of 60–365 days), the detector is sent to the laboratory, where the film is chemically etched and scanned using a digital optical reader.
The number of tracks is proportional to the average radon concentration in the air (in Bq/m³).

⚙️ Accreditation and recognition

The analysis of Radtrak3® detectors is performed by Radonova Laboratories (Sweden), accredited under ISO/IEC 17025.
This accreditation is recognized internationally, which ensure that Radonova’s measurement results are officially accepted across the European Union.
Therefore, measurement reports can be used as official documentation for regulatory or public health purposes, such as assessments of radon exposure and decisions on remedial actions in public buildings.

📏 Technical specifications

• Detector type: passive alpha-track (CR-39)
• Measurement range: 0.4–675 Bq/m³ (for a 3-month exposure)
• Exposure period: 60–365 days
• Standard uncertainty: 6 % (1 σ at 450 pCi·days/l)
• Holder type: closed housing with filter, Radonova design (antistatic plastic)

📦 Price includes

• shipping of detectors,
• accredited laboratory analysis,
• report with calculated average radon concentration,
• interpretation of results 

Source: Radonova Laboratories, Radtrak3® Technical Specification (2024)