Low-Level Radon Activity Concentration-A MetroRADON International Intercomparison.

Area of Science:

• Environmental radioactivity
• Metrology
• Radiation protection

Background:

• Traceability of radon activity concentration measurements is crucial for accurate radiation protection.
• European radon calibration facilities require validation to ensure consistent measurement standards.
• Previous intercomparisons have established the need for ongoing quality assurance in radon metrology.

Purpose of the Study:

• To validate the traceability of European radon calibration facilities through an international comparison.
• To assess the performance of continuous radon monitors used by European laboratories.
• To ensure the reliability of radon activity concentration measurements within the European metrology framework.

Main Methods:

• An international comparison involving eight European laboratories was conducted.
• Secondary standards for radon activity concentration were compared against a reference device.
• Measurements were performed using continuous monitors in a radon atmosphere traceable to a primary standard.

Main Results:

• The study successfully compared secondary standards used by European radon calibration facilities.
• Results demonstrated the traceability of radon activity concentration measurements within the tested range (100–300 Bq·m⁻³).
• The intercomparison provided valuable data on the performance of continuous radon monitors.

Conclusions:

• The international comparison confirmed the traceability of European radon calibration facilities.
• The study contributes to the reliability and consistency of radon metrology in Europe.
• Findings support the ongoing efforts within the European Metrology Program for Innovation and Research (EMPIR).