Final answer:
Decontamination should be avoided when it risks spreading contaminants, proper equipment or trained personnel are unavailable, or it could harm the environment. Practices must be observed to prevent further contamination and ensure safety.
Step-by-step explanation:
Decontamination activities should not take place under certain conditions to ensure safety for personnel, the public, and the environment. These activities should be avoided when there is a risk of spreading contaminants, when proper equipment is unavailable, when trained personnel are not available, and when there is a risk of causing harm to the environment. Detailed protocols must be followed to prevent contamination, including wearing protective clothing, proper handling and disposal of waste, and using aseptic techniques in medical procedures. The contamination of the environment can have severe effects, and it's essential to manage these risks appropriately to ensure that decontamination activities do not exacerbate the situation.