Introduction to Radon & Health Risk
The Fundamentals of Radon & Radioactivity
Radon Occurrence & Behavior
Radon Measurement & Devices
1 of 3

Radon Gas

Radon gas is measured in picoCuries per liter of air (pCi/L). A picoCurie equals one trillionth of a Curie and is used to quantify smaller measurements of radon typically found indoors.  In the United States, radon-222 gas concentrations are measured in picoCuries per liter of air (pCi/L). Therefore, one pCi/L represents the concentration of radon 222 atoms per liter of air that will result in 2.22 alpha emissions per minute. The international measurement unit is Becquerel’s with an equivalent of 1 pCi/L equal to 37 Becquerels.

Radon Decay Rate  
1 pCi/L = 2.22 alpha emissions per minute
pCi/L vs Becquerel  
1 pCi/L =  37 Bq