Radon and Progeny Detection Using Tensioned Metastable Fluid Detectors

Area of Science:

• Environmental Science
• Nuclear Physics
• Health Physics

Background:

• Radon and other alpha-emitting nuclides pose significant health risks, causing an estimated 21,000 lung cancer deaths annually in US homes.
• Airborne radioactive contamination in the nuclear industry presents safety and security challenges.
• Existing detection methods may be limited by background radiation or efficiency.

Purpose of the Study:

• To introduce and evaluate the Tensioned Metastable Fluid Detector (TMFD) sensor technology for alpha-emitting nuclide detection, specifically focusing on radon.
• To assess the TMFD's performance characteristics, including detection efficiency, energy discrimination, and accuracy under various environmental conditions.
• To demonstrate the TMFD's applicability for general-purpose alpha spectroscopy and its potential for improving radiation monitoring in homes and industrial settings.

Main Methods:

• Radon gas was sparged through a detection fluid, which was then placed in a tensioned metastable state to create detectable cavitation events.
• The TMFD system's ability to perform alpha spectroscopy through energy discrimination by tailoring tension levels was investigated.
• Performance metrics including intrinsic detection efficiency, immunity to beta and gamma radiation, measurement accuracy, precision, and environmental factor impacts (temperature, humidity) were evaluated against established standards.

Main Results:

• The TMFD demonstrated high intrinsic detection efficiencies (>95%) for alpha spectroscopy and was immune to background beta and gamma radiation.
• The system accurately measured radon concentrations between 74 Bq m⁻³ and 740 Bq m⁻³ within 24 hours, with an intrinsic relative error (IRE) of ±15% and precision <5% deviation.
• Blind testing showed the TMFD accurately measured radon concentrations within 20% of reference standards in under 6 hours, with no impact observed from relative humidity up to 95%.

Conclusions:

• The TMFD sensor technology provides a highly efficient and accurate method for detecting radon and other alpha-emitting isotopes.
• Its immunity to background radiation and robustness against environmental factors make it suitable for reliable and reusable radiation monitoring.
• The TMFD represents a significant advancement in alpha spectroscopy, offering improved safety and security for both domestic and industrial environments.