We'll have to risk contamination sometime but personally I think we'll be OK.

It can be done once only because I can't risk contamination through the air lock, so you'd better give us enough for three meals.

If we land on it to attack, we risk further contamination of Voltar.

Russian film makers who risked contamination to document the Chernobyl nuclear disaster were given a special award for short subjects.

Cutting in, Faykan said, "We have destroyed them all, so as not to risk accidental contamination."

Those stricken in their homes were abandoned there; no one wanted to risk contamination.

While the food might be safe, it will cost more, contain slightly reduced levels of B vitamins, endanger workers and risk environmental contamination.

You could see he wouldn't risk contamination by stepping in the shack.

"I will not risk contamination beyond that."

We dare not risk additional contamination of our population.