Landmark Inspections proudly uses the Radalink Telemonitor as our Radon detection technology of choice.

The Telemonitor must be exposed to the air in the house a minimum of 48 hours, and the longer the better.

Occupants of the premises are required to be informed of the need to maintain closed house conditions during the test. This does not mean nobody can come and go, only that the windows must be kept closed and the doors only opened long enough for people to pass through, coming or going.

The US and Ohio EPA strongly urges the use of tamper resistant techniques when conducting a radon test in the context of a real estate transaction.  All Radalink monitors are equipped with a tilt sensor that will log any time the monitor is moved and a power sensor that will record if the power source changes from AC to battery and back to AC.  Hourly readings of the radon concentration, temperature, relative humidity, and barometric pressure will record any unusual fluctuations resulting from Protocol violations.  In other words, it is extremely difficult to compromise a Radalink test without being caught.

Upon completing a test with the TeleMonitor, we automatically upload the data (in 30 seconds) to our laptop.  The data is then uploaded to Radalink via the first available Internet connection.

       Within the hour, Radalink processes the data, reviews it for evidence of tampering, prepares a complete personalized report, and delivers it via email to the inspector, the client, the Realtor and/or relocation company if designated. If upon analysis by Radalink, it appears in their professional opinion that closed-house conditions were not maintained, the report contains an addendum with a full explanation.

Radalink Monitors utilize pulsed ion chamber technology. Ambient air passively diffuses into the chamber in which the radon atoms (as well as the subsequent polonium decay products) disintegrate, emitting alpha particles. 

The alphas (positively charged ions) create bursts of additional ion pairs by knocking electrons from surrounding air atoms. Negative ions will pulse to the positively charged probe; positive ions will pulse to the negatively charged cylinder wall. The pulses are counted by the electrometer and stored hourly by the computer.  Detector efficiency is computed by exposures to known radon concentrations to determine the pulse counts per hour per pCi/l.

Unlike open-cage ion detectors that can record spurious counts and severely bias the measurement, Radalink’s ion chamber is specially shielded to eliminate interference from vibrations, electrical line noise, cellular phones and microwave energy.