For claw-space houses, the radon levels are reduced effectively by using high-density plastic sheet to cover the floor. Radon is vented to the outdoor by drawing it under the sheet using fans and vent pipe. Other method of radon reduction is sealing of the cracks found in the foundation that limit the radon flow into the house ("How to reduce radon levels in your home"). Conclusion

Association between lung cancer and exposure in the residential houses has been shown by many studies conducted by scientists In the United States and other parts of the world though not all studies has shown this association. The reason for this inconsistencies in the different studies is because of disparate radon levels in the homes, some studies were smaller and complexity of radon's exposure measuring in a person over time. Analysis of combined data from studies conducted on radon in the U.S. And Canada where data from thousands of people was...

There are consistencies to the risk levels increases for the estimation on the underground miner's studies (Field 1091).
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