1.   Similarly, robots like these could one day explore urban environments contaminated by radiation or chemical or biological agents.

2.   Three thousand factories and defense facilities are contaminated by radiation.

3.   Radiation can contaminate air particles, water in cooling tanks, the aluminum, magnets, electric cables and concrete in the structures where the experiments are conducted.

4.   Raising chickens on land contaminated by radiation would be cheaper than cleaning up the sites and could provide a source of safe, inexpensive food, a study suggests.

5.   Although Norway worries that radiation could contaminate its rich arctic ocean fishing grounds, Knut Gussgard of the state Nuclear Protection Authority said there is little cause for alarm.

6.   Hundreds of thousands were evacuated from the area, and a similar number were estimated to have been contaminated by radiation.