Which type has penetrating-high, shielding with lead, steel, and concrete, hazard highest due to penetrating ability and common occurrence in organs?

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

Answer: (A)

Gamma radiation has penetrating-high power, meaning these rays can pass through most materials, including the body. Because of this deep reach, shielding isn’t achieved with thin barriers; dense materials like lead, steel, and thick concrete are used to reduce exposure. This broad penetration also means gamma rays can reach internal organs even when the source is outside the body, making their hazard particularly high. Alpha particles, by contrast, are heavy and stopped by a sheet of paper or skin, so they're not a deep-penetration threat unless ingested or inhaled. Beta particles penetrate more than alpha but are still limited and are shielded effectively by lightweight materials. Neutrons also penetrate, but their shielding depends on energy and typically requires hydrogen-rich materials; gamma radiation remains the most consistently penetrating hazard in many workplace scenarios.