Final answer:
The three levels of decontamination are immediate decon, intermediate decon, and thorough decon, each with a different approach to reducing contamination.
Step-by-step explanation:
The three levels of decontamination are immediate decon, intermediate decon, and thorough decon. Immediate decon is the first level and involves removing or neutralizing contaminants as quickly as possible to prevent further spread. Intermediate decon is the second level, which focuses on reducing contamination to safe levels. Thorough decon is the highest level and aims to remove all contamination.