Which decay products of radon are considered to pose a greater health risk due to their alpha-emitting nature?

The key to understanding this question lies in the nature of alpha particles and their interaction with biological tissues. Radon decay products, specifically those that emit alpha particles, are more concerning from a health perspective because alpha particles are highly ionizing but have a very short range in air and cannot penetrate the skin. However, when these alpha-emitting particles are inhaled or ingested, they can cause significant damage to internal tissues.

Alpha radiation is particularly harmful when the source of the radiation is within the body, as it can lead to cellular damage and increase the risk of conditions like lung cancer. The dangerous effect of these alpha-emitting radon decay products is compounded by the fact that radon is a gas and can accumulate in homes, especially in poorly ventilated areas.

Therefore, the presence of alpha particles as decay products of radon directly contributes to the higher health risks associated with radon exposure, making this answer the most appropriate choice. It reflects the established understanding of the dangers of radon and its decay products, emphasizing the specific hazards that alpha particles represent in the context of radiation health risk assessments.