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Show 'Nuclear reactors are key to future ' energy vjee , water reactor," said Dr. Hilberry. Dr Hilberry said that even though "leakage" of radioactivity, even in areas of proximity to the reactor itself, is far below human tolerance levels, there are still enormous problems with pressurized water reactors. Helium reactors as n , demonstrated are " almost exactly 'ike w . The two main diff Sr helium instead of J: the uranium J'J J fission, and instead of ' ' task of cooling water & i can simply be released ural "heat sink" 0f spai berry when questioned", : amount of radioactivity 1 with the helium gas' cant. "A handful of uranium is equal in potential energy to an 85-ton carload of coal," said Dr. Norman Hilberry in his lecture titled "An Assessment of Nuclear Reactors." The lecture, the second of a series of lectures dealing with various aspects of radiation and its meaning for man, was presented Friday at noon in the Physics Building. Dr Hilberry said that from the time man first started using fire to warm himself, he has steadily depleted the earth's known energy sources. He said that as fossil fuels are quickly depleted, and the evolution of pollution isquickenmg at an equal rate, by 1995, U.S. oil reserves will be used up along with breathable air. Since 80 per cent of our electricity elec-tricity is generated with this fossil fuel we now must "absolutely have a new energy source. "Unless something else becomes available the next decade, said Dr. Hilberry. "This new source of energy must necessarily be energy created through nuclear reactors." . 1 Dr. Hilberry said that the are two basic kinds of nuclear reactors now in use in the United States-The States-The first, although not the .best of the two is the pressurized water factor. The other, which is stilhn final stages of development, is the helium reactor. "The basics of a pressurized water reactor are really quite simple," said Dr. Hilberry. There is a center or "core" of uranium undergoing nuclear fission. Around this core are huge pipes of water. The water is converted to steam by heat generated through the core of nuclear fission. The steam in turn, heats adjacent pipes, connecting more water into steam. This steam travels through pipes and is used in generating electricity. "Idaho Falls is supplied right now with electrical power generated by a pressurized |