Comparison of Radon and Thoron Concentration Measuring Systems Among Asian Countries

Area of Science:

• Environmental Science
• Metrology
• Radiological Health

Background:

• Accurate measurement of radon and thoron is essential for public health and compliance with future air quality regulations.
• Harmonization and validation of measurement systems are critical for quality assurance in environmental monitoring.
• Existing radon and thoron measuring systems require validation to ensure reliable data.

Purpose of the Study:

• To validate the degrees of equivalence and measurement precisions of radon and thoron measuring systems.
• To assess the performance of five radon and four thoron measuring systems across four Asian countries.
• To establish the reliability of measurement data for regulatory compliance and scientific research.

Main Methods:

• A comparison experiment was conducted involving participants from China, India, Japan, and Thailand.
• Transfer measurement devices for radon and thoron from the National Institutes for Quantum and Radiological Science and Technology were used.
• Ratios between assigned values and participants' measured values, along with associated uncertainties, were derived.

Main Results:

• The ratio values and measurement uncertainties were determined for each activity concentration.
• Statistical analysis was performed to evaluate measurement bias.
• Degrees of equivalence between assigned values and participants' instrument values were established.

Conclusions:

• The study successfully validated the performance of multiple radon and thoron measuring systems.
• The findings provide crucial data for ensuring the quality and harmonization of radon and thoron measurements in Asia.
• This validation supports the readiness for future legal regulations concerning indoor radon levels.