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Understanding Radon Measurement: pCi/L

Understanding Radon Measurement: What is \


Understanding Radon Measurement: What is "pCi/L"?

Radon is a radioactive gas that can seep into homes and buildings from the ground beneath, posing serious health risks when present in elevated concentrations. The measurement of radon levels is typically expressed in "pCi/L," which stands for picocuries per liter. But what exactly does this mean, and what are the common levels across various types of infrastructure?

What is "pCi/L"?

A picocurie (pCi) is a unit of radioactivity equal to one trillionth (1/1,000,000,000,000) of a curie. In the context of radon measurement, "pCi/L" quantifies the concentration of radon gas in the air within a specific volume, namely, one liter of air. This measurement is used to assess the potential health risk associated with radon exposure.


Understanding Radon Measurement: What is \

Common Radon Levels in Different Infrastructure:


Understanding Radon Measurement: What is \

Residential Homes:

The Environmental Protection Agency (EPA) and Health Canada recommend that radon levels in homes should not exceed 4 pCi/L.
Levels between 2-4 pCi/L are a moderate risk, and action to reduce radon exposure is encouraged.
Levels above 4 pCi/L indicate a high risk, and radon mitigation is necessary to lower these concentrations to a safer level

Schools and Commercial Buildings:

Like residential homes, the recommended action level for radon in schools and workplaces is typically 4 pCi/L.
However, different regions and countries might have slightly varying guidelines, so it's crucial to consult local authorities.

Underground Spaces and Mines:

Underground spaces, such as mines, can have significantly higher radon levels, often well above the recommended action levels for indoor spaces.
Workers in such environments are typically required to wear radon monitoring devices to ensure their exposure remains within safe limits.

Water Sources:

Radon can also be found in drinking water. The recommended action level for radon in water can vary, but it often ranges from 5,000 to 10,000 pCi/L.
Mitigation systems can be installed to reduce radon levels in water if necessary.


Understanding "pCi/L" is crucial in assessing radon exposure risks and implementing appropriate mitigation measures. Regular testing and, if necessary, professional mitigation by your local National Radon Defense dealer can help ensure that radon concentrations remain within safe limits, protecting the health of occupants in various types of infrastructure such as your home.