Which radiation type is most damaging?

• A. Alpha Radiation
• B. Beta Radiation
• C. X-Ray Radiation
• D. Gamma Radiation

Answer: (D)

Gamma radiation is the most damaging because it is highly penetrating, able to pass through the body and deposit ionizing energy in deep tissues and organs. Alpha particles cause intense ionization but are stopped very quickly by skin or a few centimeters of air, so external exposure is not as harmful. Beta particles penetrate more than alpha and can affect superficial tissues or get to internal tissues if inhaled or ingested, but they don’t reach deep structures as readily as gamma. X-rays are also penetrating, yet gamma rays typically deliver ionizing energy to deeper, internal tissues from external exposure levels, making them more likely to cause significant damage.