Which shielding approach is effective against gamma radiation as described in the material?

Which shielding approach is effective against gamma radiation as described in the material?

• A. Gamma rays can be absorbed by shielding like thick lead or meters of concrete.
• B. Gamma rays are completely stopped by a sheet of glass.
• C. Gamma rays require no shielding.
• D. Gamma rays cannot be detected.

Answer: (A)

Gamma radiation is highly penetrating, so effective shielding relies on material density and atomic number. The photons interact with matter through processes like the photoelectric effect, Compton scattering, and, at higher energies, pair production. Each interaction removes or deflects photons, and the chance of interaction increases with denser, higher‑Z materials. Thick layers of dense material, such as lead or concrete, provide many opportunities for these interactions, so they can substantially reduce gamma intensity. That’s why thick lead or meters of concrete are the practical shielding approaches. A thin sheet of glass is far too thin and not dense enough to absorb a meaningful number of gamma photons, so it won’t provide adequate shielding. Gamma rays aren’t stopped by nothing; they can still be detected even behind shielding, and shielding work is usually planned alongside time and distance controls to minimize exposure.

Gamma radiation is highly penetrating, so effective shielding relies on material density and atomic number. The photons interact with matter through processes like the photoelectric effect, Compton scattering, and, at higher energies, pair production. Each interaction removes or deflects photons, and the chance of interaction increases with denser, higher‑Z materials. Thick layers of dense material, such as lead or concrete, provide many opportunities for these interactions, so they can substantially reduce gamma intensity. That’s why thick lead or meters of concrete are the practical shielding approaches.

A thin sheet of glass is far too thin and not dense enough to absorb a meaningful number of gamma photons, so it won’t provide adequate shielding. Gamma rays aren’t stopped by nothing; they can still be detected even behind shielding, and shielding work is usually planned alongside time and distance controls to minimize exposure.