In the decontamination process for a re-entry operation, what is the first step?

• A. Detailed decon in the decon corridor/shower
• B. Gross decon at the warm zone boundary
• C. Post-decon inspection
• D. Proper waste disposal

Answer: (B)

In a re-entry decontamination sequence, the priority is to rapidly remove the majority of contamination right at the transition between the dirty and cleaner areas. This is done as gross decontamination at the warm zone boundary. By wiping or washing away the bulk of contaminants at this point, you significantly reduce what would otherwise be carried into the cleaner zones and what later decon steps must handle. This makes subsequent detailed decon in the decon corridor or shower more effective and reduces exposure and waste. After gross decon, you proceed to the more thorough cleaning, followed by post-decon inspection and proper waste disposal. Starting with gross decon is preferable because it quickly lowers contamination loads before more time-consuming, finer cleaning steps.