Short-term vs. Long-term radon testing

Short-term tests use activated-charcoal canisters deployed for 48–96 hours under closed-house conditions. They provide a rapid screening snapshot and are appropriate for real estate transactions or initial screening. Long-term tests use alpha-track detectors deployed for 90 days to one year. Because radon levels fluctuate with seasons, weather patterns, and occupancy behavior, long-term tests give the most accurate picture of actual annual exposure.