Which radiation is most damaging to living tissue?

Which radiation is most damaging to living tissue?

• A. Gamma rays
• B. Radio waves
• C. Infrared
• D. Visible light

Answer: (A)

Damage from radiation depends on whether its energy is enough to ionize atoms in living cells. Ionizing radiation can knock electrons off atoms, creating free radicals that can damage DNA and other vital molecules, leading to mutations or cell death. Gamma rays have extremely high energy per photon because of their very short wavelength and high frequency, so they readily ionize atoms and can penetrate deeply into tissues. That combination makes them capable of causing the most harm to living tissue among the options. The other types—radio waves, infrared, and visible light—have much lower energy per photon and are generally non-ionizing at typical exposures, mainly warming tissue rather than causing direct molecular damage. Hence, gamma rays are the most damaging.

Damage from radiation depends on whether its energy is enough to ionize atoms in living cells. Ionizing radiation can knock electrons off atoms, creating free radicals that can damage DNA and other vital molecules, leading to mutations or cell death. Gamma rays have extremely high energy per photon because of their very short wavelength and high frequency, so they readily ionize atoms and can penetrate deeply into tissues. That combination makes them capable of causing the most harm to living tissue among the options. The other types—radio waves, infrared, and visible light—have much lower energy per photon and are generally non-ionizing at typical exposures, mainly warming tissue rather than causing direct molecular damage. Hence, gamma rays are the most damaging.