Medicine: Neutrons Against Cancer

Twice a week Betty S., a 42-year-old artist from Chicago, makes the 30-mile trip between her home and Batavia, Ill. There she enters a large concrete-lined room in the Fermi National Accelerator Laboratory, takes a seat in what resembles nothing so much as an electric chair, and waits while a technologist helps her don a mask that holds her face totally immobile. Just before the platform under the chair is lowered beneath floor level, the growth in her throat is located by X ray and pinpointed by three intersecting low-power laser beams. Then Betty's...

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