Describe Alpha particles.

Describe Alpha particles.

• A. Positively charged particles that are relatively slow moving and weak. Can cause problems when inhaled or ingested
• B. Negatively charged particles that are fast and highly penetrating
• C. Neutral particles with no charge
• D. Electromagnetic waves with negligible mass

Answer: (A)

Alpha particles are helium nuclei: they carry a positive charge and have relatively large mass, which gives them low penetrating power. They travel only short distances in air and can be stopped by a sheet of paper or the outer layer of skin. The real hazard comes from internal exposure—if alpha-emitting material is inhaled or ingested, it deposits a lot of energy directly in internal tissues, causing significant cellular damage and increasing cancer risk. This is why they’re described as positively charged, slow, and weak in terms of penetration, and why internal exposure is the major concern. The other options describe different radiation types: beta particles are negatively charged and more penetrating; neutrons are neutral; and electromagnetic waves (like gamma rays) have no mass and are also highly penetrating, not characteristic of alpha radiation.

Alpha particles are helium nuclei: they carry a positive charge and have relatively large mass, which gives them low penetrating power. They travel only short distances in air and can be stopped by a sheet of paper or the outer layer of skin. The real hazard comes from internal exposure—if alpha-emitting material is inhaled or ingested, it deposits a lot of energy directly in internal tissues, causing significant cellular damage and increasing cancer risk. This is why they’re described as positively charged, slow, and weak in terms of penetration, and why internal exposure is the major concern. The other options describe different radiation types: beta particles are negatively charged and more penetrating; neutrons are neutral; and electromagnetic waves (like gamma rays) have no mass and are also highly penetrating, not characteristic of alpha radiation.