Radon Measurement
Radon measurement establishes the concentration of radon in indoor air. This naturally occurring radioactive gas forms as uranium decays in rocks and soils, then enters buildings through floors, cracks and gaps around pipes or cables. It has no colour, smell or taste, so its presence and concentration require a suitable test or monitor.
Digital instruments display readings and changes over time, while passive detectors collect exposure for laboratory analysis. The method depends on the setting, measurement period and purpose. Celtic Surveys supplies Airthings Corentium instruments for household monitoring, trend observation and continuous measurements, while formal Irish radon testing remains subject to Environmental Protection Agency procedures.
Why Is Radon Measurement Important?
Radon levels differ between buildings and rooms in the same property. Ireland’s radon risk map indicates geographical potential but cannot establish the concentration inside one building. A nearby result does not replace measurements from your own property.
Long-term radon exposure increases the risk of lung cancer. The EPA links about 350 lung cancer cases in Ireland each year to radon. Current Irish reference levels are 200 Bq/m³ for homes and 300 Bq/m³ for workplaces. They guide further action, while risk reflects concentration and exposure duration.
Indoor concentrations change with ventilation, weather, heating and building conditions. A short reading may show a temporary rise or fall, whereas a longer average reduces the influence of an unusual period. Within Environmental Monitoring, radon requires its own detector, averaging period and interpretation method.
How Are Indoor Radon Readings Collected?
Passive testing and active digital monitoring work differently. For the EPA-recommended home test, two passive detectors remain in a main bedroom and living room for three months. An EPA-registered testing service then analyses them, producing the result used for comparison with the 200 Bq/m³ home reference level.
A digital radon detector samples indoor air continuously and calculates concentration electronically. Airthings sensors use passive diffusion chambers and alpha spectrometry to count energy from particles produced as radon decays. Results are expressed in becquerels per cubic metre, written Bq/m³, representing radioactive activity within that volume of air.
Radon is reported as an average rather than an instant measurement. Early values describe recent conditions, while longer averages use more samples. A digital radon gas monitor indicates levels, trends and changes after remedial work, but EPA guidance requires a three-month test when comparing a home with the national reference level.
A dedicated radon instrument does not measure carbon dioxide, smoke, particles or every airborne gas. Those Air Quality conditions require different sensors and methods. Display, application, storage and transfer functions also vary between radon monitors.
Where Is Radon Measurement Used?
Radon testing takes place in homes, workplaces, schools and other occupied buildings. Household monitoring shows changes over days, weeks and seasons, including those following ventilation changes or remediation. The measurement period still determines what the displayed average represents.
Workplace testing follows Irish legal requirements and the EPA Measurement Protocol. Requirements cover specified premises in High Radon Areas and underground workplaces. EPA workplace measurements run for at least three months, with each tested room compared against the 300 Bq/m³ reference level.
Schools use room-based measurements, while property checks and post-remediation monitoring have separate purposes. Instrument capability and protocol compliance are different considerations. A continuous monitor can collect detailed data, but placement, duration, testing service and reporting must still suit the required Irish procedure.
What Influences a Radon Reading?
Duration matters because radon fluctuates hourly, daily and seasonally. Room selection, measurement height, nearby doors or windows, direct airflow and device movement affect the average. Formal tests have specified placement and duration requirements, while continuous comparisons depend on a consistent monitor position.
Ventilation, weather, ground conditions, heating and building work alter radon entry or dilution. Differences between indoor and ground pressure influence movement through cracks and service gaps, although measuring Pressure requires separate equipment. Selected monitors record temperature and Humidity as supporting conditions rather than replacements for radon readings.
A monitor records concentration around its sensor rather than locating the entry route or determining remedial work. Correctly gathered averages give a more useful basis for interpretation than one isolated reading, particularly when indoor conditions vary during the measurement period.
Order Radon Measurement Equipment from Celtic Surveys
Celtic Surveys supplies Corentium Home, Corentium Wave and Corentium Pro. Corentium Home is a battery-powered unit with an LCD showing one-day, seven-day and long-term averages. Corentium Wave combines radon, temperature and humidity sensors with a colour indication and Bluetooth application data. Its status indication is visual rather than audible.
Corentium Pro uses four radon chambers in parallel and stores readings at one-hour resolution. Bluetooth transfer, reporting and temperature, humidity, pressure and tilt sensors support detailed records. Its AARST/NRPP certification relates to North American requirements and does not replace the EPA procedure for formal Irish testing.
Selection depends on the setting, averaging period, display or application preference, storage, reporting, portability and applicable protocol. Need help choosing radon measurement equipment for your work? Call 01 801 1335 or email sales@celticsurveys.ie for practical product advice before buying.