Radon can enter houses with cracks in floors, walls, or structures, and gather inside. It can likewise be released from constructing materials, or from water obtained from wells which contain radon. Radon degrees can be greater in houses that are well insulated, securely secured, and/or built on dirt rich in the components uranium, thorium, as well as radium. Due to the fact that of their closeness to the ground, basement and first floors normally have the greatest radon degrees.