Gamma Radiation has no mass or weight and is not easily stopped.

Gamma Radiation has no mass or weight and is not easily stopped.

• A. Alpha Radiation
• B. Beta Radiation
• C. Neutron Radiation
• D. Gamma Radiation

Answer: (D)

Gamma rays are photons, which means they have no rest mass and no electric charge. Because they’re pure energy, they interact with matter mainly by absorption and scattering rather than by exchanging energy with charged particles. This gives them a high penetrating power: they can travel through air and through many materials with relatively little attenuation. To significantly reduce or stop gamma radiation, you need dense shielding, such as thick layers of lead or concrete. This combination—no mass or charge and strong penetrating ability—explains why gamma radiation is described as not easily stopped. Other forms of radiation consist of massive, charged particles and are attenuated much more readily by thin barriers, which is why gamma radiation stands out for its penetration.

Gamma rays are photons, which means they have no rest mass and no electric charge. Because they’re pure energy, they interact with matter mainly by absorption and scattering rather than by exchanging energy with charged particles. This gives them a high penetrating power: they can travel through air and through many materials with relatively little attenuation. To significantly reduce or stop gamma radiation, you need dense shielding, such as thick layers of lead or concrete. This combination—no mass or charge and strong penetrating ability—explains why gamma radiation is described as not easily stopped. Other forms of radiation consist of massive, charged particles and are attenuated much more readily by thin barriers, which is why gamma radiation stands out for its penetration.