Evaluating Consumer Digital Radon Detectors: A Study Summary
Radon, a radioactive gas, is the second-leading cause of lung cancer globally. Monitoring radon levels in homes has become more accessible with the rise of consumer-grade digital radon detectors. A recent study by Kansas State University (KSU) Engineering Extension analyzed the accuracy and precision of eight consumer-grade radon monitors to help homeowners make informed choices.
Study Overview
The study exposed eight different digital radon monitors to varying levels of radon concentrations in a controlled environment at the KSU Radon Chamber. Each device was tested for accuracy and precision over a seven-day period at three different radon concentrations: 0.6 pCi/L (ambient), 12.8–15.5 pCi/L, and 27.7–29.4 pCi/L. These concentrations simulate typical household conditions and ensure a rigorous evaluation of the devices.
Key Findings
- Accuracy: Most of the tested devices fell within the acceptable range for accuracy (within ±25% of true radon levels) for radon concentrations above 12.8 pCi/L. Seven of the eight devices met this standard for concentrations between 12.8 and 15.5 pCi/L. However, accuracy decreased at ambient levels, with some devices falling outside the acceptable range.
- Precision: All eight devices passed the precision test (coefficient of variation under 15%) for radon concentrations above 12.8 pCi/L. At lower concentrations (such as 0.6 pCi/L), three devices showed less precision, indicating that consumer radon detectors may struggle to maintain precision at very low radon levels.
- Consumer Use: The study reinforces that while consumer-grade radon detectors can offer a general understanding of radon exposure, they are not a replacement for professional radon measurement devices. Homeowners using these devices should follow proper testing protocols, and professional devices should still be used for mitigation decisions.
Why This Matters
Consumer interest in digital radon detectors is rising, especially for continuous monitoring of radon mitigation systems. However, these devices are not certified for making critical mitigation decisions. Understanding their limitations ensures homeowners can monitor radon safely and take appropriate actions when necessary.
For more details on how to properly test your home for radon or make mitigation decisions, visit the EPA’s Radon Page.
If you have more questions or want an accurate measurement or need to take care of your radon problem, CONTACT US!
Attribution:
Bahadori A, Hanson B. Evaluation of consumer digital radon measurement devices: a comparative analysis. J Radiol Prot. 2024 May 24;44(2). doi: 10.1088/1361-6498/ad4bf1. PMID: 38749401.
