PRO-LAB Long-Term Alpha Track Radon Test Kit

Short-term charcoal radon tests give you a quick 2–4 day snapshot, but radon levels in a home fluctuate significantly with seasons, weather, and soil conditions. A reading taken in summer may be 30–50% lower than the same home measured in winter. For the most accurate, year-round picture of your radon exposure, the EPA and NRPP recommend a long-term alpha track test lasting at least 90 days.

The PRO-LAB Long-Term Alpha Track Radon Test uses a small detector made of a special plastic film (CR-39 polycarbonate) that records microscopic damage tracks left by alpha particles emitted from radon decay products. Unlike charcoal kits that saturate within 96 hours, the alpha track device continuously records radon activity throughout the full test period, producing a single integrated result that represents your true average exposure.

To use the kit, simply hang or place the detector in your lowest occupied living area and leave it undisturbed for 91–365 days. When the test period ends, seal it in the prepaid return mailer and send it to PRO-LAB's certified laboratory. You'll receive a comprehensive result report within 5–7 business days, along with detailed EPA guidance for interpreting your readings.

Long-term testing is particularly important before committing to radon mitigation (a $800–$2,500 investment) or when purchasing a home in a known high-radon region.