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The term refers to contamination, which specifically denotes the presence of unwanted or hazardous substances or materials on protective equipment. This can occur during operations where hazardous materials are handled, leading to an accumulation of these substances on protective gear. Contamination is a critical concern in hazardous waste operations because it can compromise the effectiveness of the protective equipment, increasing the risk of exposure to the worker.

Decontamination, while related, refers to the processes used to remove contaminants from surfaces or equipment to ensure safety. Hazard zones are geographical areas identified based on the levels of hazard present, and exposure pertains to the actual contact with hazardous materials that can affect health. In summary, contamination signifies the direct addition of harmful substances to protective gear, which is why the answer is associated with the term that best captures that concept.