What are the three key methods to minimize contamination when dealing with radioactive hazards?

The correct answer focuses on the principles of controlling exposure to radioactive materials, which are essential for minimizing contamination and reducing the risk of radiation exposure.

Time refers to limiting the duration of exposure to radioactive sources. The longer an individual is exposed to radiation, the greater the potential for harmful effects. By minimizing the time spent near these hazards, personnel can decrease their overall radiation dose.

Distance relates to maintaining a safe space from the radioactive source. Radiation intensity decreases sharply with increased distance from the source, following the inverse square law. Therefore, increasing distance is a highly effective method of protecting oneself from radiation exposure.

Shielding involves using barriers made of materials that can absorb or deflect radiation. Common shielding materials include lead, concrete, or even water, depending on the type of radiation involved. Effective shielding reduces the radiation levels that reach individuals, thus minimizing contamination risks.

These three methods—time, distance, and shielding—form a comprehensive strategy to protect personnel from radiation hazards while effectively managing and mitigating risks associated with radioactive materials. This is why option A is the best choice.