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There are several different methods of testing Radon levels. For simplicity reasons we will stick with the most commonly used.

Short-term Tests: Activated Carbon Adsorption (AC) & Charcoal Liquid Scintillation (LS)

Most short term radon tests will use activated charcoal to absorb the radon gas in the air. Various short terms tests kits will include some type container filled with activated charcoal, usually perforated or screened and has a filter to keep out radon decay products.

– Quick and easy. Testing usually takes between 2-90 days depending on the type of test.
– Low cost for services; costs may range from $10 to $40 per test kit.
– Practical for screening purposes over a short period of time.

-Some charcoal absorbers are more sensitive than others to temperature and humidity.
-Less likely to tell you a year-round average radon level.

Long-term Tests: Alpha-Track Detection (AT)

The detector is a small sheet of special plastic material enclosed in a container with a filter-covered opening. The radon gas that enters the container decays, emitting alpha particles. The particles strike the plastic sheet, leaving tracks that can be chemically enhanced and counted using a microscope or an automated counting system.

• Relatively low-cost services ranging from $15 to $30 for each detector.
• More likely to tell you year-round average radon levels.

• Relatively long measurement period (3 months is the recommended minimum for most long-term kits).

Professional Testing: Continuous Radon Monitoring (CR)

There are three types of CR monitors used for radon measurements, usually by radon measurement professionals. The test types are: 1) Scintillation, 2) Ionization Chamber, and 3) Solid-State Detection. This type of radon monitoring follows the ambient radon levels within a short time lag due to the inherent delay of the radon decay products.

Follows the variations in radon levels.
Provides radon data on location.
Has the highest accuracy and precision over short measurement periods.

High cost for service requiring a professional to perform the measurement.
Limited primarily to short-term testing.

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