21.   Radiation is typically used with women who have breast-conserving surgery rather than a mastectomy.

22.   That agency was chosen instead of the Centers for Disease Control, officials recalled, because it already inspected sun-tan parlors and other facilities using radiation.

23.   Ultraviolet systems use light radiation to kill certain waterborne microorganisms.

24.   While microwaves send water molecules racing, thereby heating the food, irradiation uses gamma radiation to kill microorganisms without heat.

25.   But the court suggested instead that he had wanted to use the radiation to hurt his girlfriend.

26.   He was a physicist experimenting with ways to use radiation to treat brain cancer.

27.   In a trial run which successfully eliminated the flies from the Tanzanian island of Zanzibar, scientists bred thousands of male tsetses and used radiation to sterilize them.

28.   Knipling and colleague R.C. Bushland used radiation to sterilize male screwworm flies, which then were released to mate with female flies in the wild.

29.   Others worry about security and environmental problems, especially if radiation is used.