How to use "contamination" in a sentence

I've always believed that he died in the outside world, in the contamination." She rolled the fruit between her fingers

The government's story about contamination is all a big lie, but it's too dangerous to challenge it, or to talk about this."

They've found out that it isn't true about the contamination

They've discovered that the contamination is all a lie and they're trying to find ways through the force field!"

In the event of accidental contamination, you immediately set off an alarm