Which of the following statements about radon-222 is NOT true?

Radon-222 is a naturally occurring radioactive gas that is produced from the decay of uranium found in soil and rock. It can indeed accumulate in homes, particularly in poorly ventilated spaces, increasing the risk of exposure. While radon is dangerous because of its radioactive properties and potential health risks, it does not bind with hemoglobin in the blood. Instead, radon exposure primarily poses a risk of lung cancer due to inhalation of radon decay products, which can damage lung tissue over time. This distinction is critical in understanding the health impacts of radon exposure.

The other statements about radon-222 are accurate. It is a radioactive gas, which means it emits radiation as it decays. Its presence in soil and rock is a natural phenomenon, as it is often found in concentrations that can lead to accumulation in buildings, especially basements or areas with poor airflow.