![]() Long-term tests determine the average concentration for more than 90 days. Short-term detectors measure radon levels for 2 days to 90 days, depending on the device. In addition, rain or snow, barometric pressure, and other influences can cause radon levels to vary from month to month or day to day, which is why both short- and long-term tests are available. Homes that are next door to each other can have different indoor radon levels, making a neighbor’s test result a poor predictor of radon risk. Indoor radon levels are affected by the soil composition under and around the house, and the ease with which radon enters the house. Testing is the only way to know if a person’s home has elevated radon levels. How can people know if they have an elevated level of radon in their homes? Techniques to measure a person’s exposure to radon over time have become more precise, thanks to a number of studies carried out in the 1990s and early 2000s. ![]() This increased risk was consistent with the estimated level of risk based on studies of underground miners. The results of this analysis demonstrated a slightly increased risk of lung cancer for individuals with elevated exposure to household radon. By combining the data from these studies, scientists were able to analyze data from thousands of people. Researchers have combined and analyzed data from all radon studies conducted in Canada and the United States. In these studies, scientists measure radon levels in the homes of people who have lung cancer and compare them to the levels of radon in the homes of people who have not developed lung cancer. ![]() Recent research has focused on specifying the effect of residential radon on lung cancer risk. Scientists agree that radon causes lung cancer in humans. ![]()
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