Quality Assurance & Quality Control
Introduction to Radon Mitigation
Worker Health & Safety
2 of 3

Dynamic Equilibrium

The mechanisms previously described can prevent the decay products from reaching dynamic equilibrium, which is the balance of the amount of RDPs produced and lost.  Typically, it takes 12 hours for Dynamic Equilibrium to be achieved after doors and windows have been closed.  See Figure 4-7.

Figure 4-7
Dynamic Equilibrium in the Home
Source: J. Burkhart
Dynamic Equilibrium [dahy-nam-ik    ee-kwuh-lib-ree-uh m]
The steady-state in which the entry rate of radon gas and its RDPs becomes equal.