Here you can find the detailed information about an individual approach used in the Czech Republic for protection of new as well as existing houses against radon penetration from the ground (legislation, methods, preventive measures in new houses, remedial measures in existing houses, radon awareness).

Details:

Radon Programme and Czech Legislation 

Protection of New Buildings

Remedial Measures in Existing Buildings - Technical Solutions, Experiences

Human Perception of Radon Risk and Radon Mitigation