Internal exposure is associated with deposition of energy by which types of radiation?

Internal exposure is associated with deposition of energy by which types of radiation?

• A. Gamma & X-ray
• B. Alpha, Beta, & Neutron
• C. Ultraviolet light
• D. Visible light

Answer: (B)

Internal exposure happens when radioactive material is inside the body. The energy deposited in tissues comes from the particles emitted by those internal sources. Alpha particles deliver a large amount of energy over a very short range, so they cause intense ionization and damage to nearby cells even though they don’t travel far. Beta particles travel farther than alpha but still deposit most of their energy within surrounding tissue, producing localized dose. Neutrons, while not charged, transfer energy through nuclear interactions with atoms in the body, creating ionizations and secondary reactions that contribute strongly to the internal dose. In contrast, gamma and X-ray photons are highly penetrating and tend to pass through tissue, so their energy deposition is more distributed and not as localized to the immediate vicinity of the source inside the body. Ultraviolet and visible light are not typically involved in internal exposure scenarios.

Internal exposure happens when radioactive material is inside the body. The energy deposited in tissues comes from the particles emitted by those internal sources. Alpha particles deliver a large amount of energy over a very short range, so they cause intense ionization and damage to nearby cells even though they don’t travel far. Beta particles travel farther than alpha but still deposit most of their energy within surrounding tissue, producing localized dose. Neutrons, while not charged, transfer energy through nuclear interactions with atoms in the body, creating ionizations and secondary reactions that contribute strongly to the internal dose.

In contrast, gamma and X-ray photons are highly penetrating and tend to pass through tissue, so their energy deposition is more distributed and not as localized to the immediate vicinity of the source inside the body. Ultraviolet and visible light are not typically involved in internal exposure scenarios.