Gross decontamination is described as the initial phase that removes most of the contaminants.

• A. Initial phase, removes most of the contaminants
• B. Final phase, removes a small amount of contaminants
• C. Secondary phase, adds decontamination
• D. Optional step with no effect

Answer: (A)

Gross decontamination is the initial, rapid bulk cleaning step designed to remove the majority of contaminants quickly, to reduce exposure and prevent spread. This early phase focuses on fast, broad removal before more thorough cleaning is done. After gross decon, a secondary or technical decontamination step addresses residual contamination with more detailed methods. The other descriptions don’t fit because they imply the phase is final, only removes little, or is optional with no effect, none of which aligns with the purpose of gross decontamination.