Scrapping 2 Costly Reactors, Canada Reopens Aging One.

Atomic Energy of Canada will continue to rely on a 51-year-old reactor to produce most of the world's radioactive medical isotopes after deciding Friday to abandon two troubled replacement units. The aging reactor was temporarily closed by Canada's nuclear regulator in November because it lacked some required safety equipment. That provoked a worldwide shortage of isotopes as well as a controversy in Canada about the independence of the regulator after the government fired its head. [ABSTRACT FROM PUBLISHER]