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Chapter 10: Problem 17

In what part of the house is the radon that contaminates the air of some homes usually found, and where does it come from?

Short Answer

Expert verified
Radon is typically found in the lowest levels of a house, such as basements and crawl spaces, as these areas are closer to the source (soil) and have poorer ventilation. It originates from the radioactive decay of uranium, which is present in soil, rocks, and groundwater. The gas can enter a house through cracks and openings in the foundation, floor, and walls, seeping into indoor spaces.

Step by step solution

01

Introduction to Radon

Radon is a naturally occurring radioactive gas which is colorless, tasteless, and odorless. It is formed by the radioactive decay of uranium, which is present in soil, rocks, and groundwater. When released into the air, radon gas can accumulate in buildings, posing a potential risk to human health, as it contributes to indoor air pollution and is considered a leading cause of lung cancer.
02

Location of Radon in Houses

Radon usually enters a house from the ground and gets trapped indoors, especially in poorly ventilated spaces. In residential buildings, radon is typically found in the lowest levels of the house, such as basements and crawl spaces. This is where the gas is more likely to accumulate, as it is closer to the source (soil) and is less ventilated compared to the upper floors.
03

Origin of Radon

As mentioned earlier, radon originates from the radioactive decay of uranium, found naturally in soil, rocks, and groundwater. The soil and rock beneath a house can contain varying amounts of uranium, which releases radon gas as it decays. This gas can move through tiny cracks and openings in the foundation, floor, and walls of a house, seeping into indoor spaces. In addition, radon can be dissolved in groundwater and released when water is used for drinking, cooking, or showering. However, this route is a less significant source of indoor radon exposure compared to soil gas entry.

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