Why is radon-222 considered dangerous? it is the second leading cause of lung cancer in the u. s. it cannot be seen, smelled, or tasted. it is a product of the natural decay of uranium and is often found in the soil on which houses are built. all of these nuclear medicine is only useful for diagnosing a few, select diseases. true false from an environmental perspective, it is important to ensure that radioactive materials are stored properly, because radioactive samples: can be in liquid, solid or gas forms once they are leaked into the environment, could cause serious health hazards to all living organisms can remain radioactive for long periods of time can do all of these which of the following statements is correct regarding spent fuel rods? they are no longer radioactive. they contain only one type of isotope of the fuel (uranium). they usually remain radioactive for less than 100 years. they are scheduled for deep underground burial. all low-level waste disposal sites use a series of natural and engineered barriers to prevent radioactivity from reaching the biosphere. true false nuclear energy is considered an alternative energy because it is renewable, does not pollute the environment, and reduces carbon dioxide emissions. true false