Explain why people want to have the Radon level in the basement measured when they buy a house. Please include detailed explanations, such as what kinds of nuclear decays and/or nuclear reactions happen a lot if the Radon level in the basement is too high, what specific corresponding nuclear reaction formulas are involved, what other particles are present along with the high Radon level, why some houses have high Radon levels but not the next-door neighbor's house, why it is not safe to live in a house that has a high Radon level, and what can be done to mitigate the high Radon problem so that it is safe for people to live in that house.