Since many metals show a considerable increase in yield strength after neutron exposure at pile temperature, the described experiments appeared to be suitable for investigating the nature of radiation damage that can be produced in this temperature range. Nickel specimeas of 99.999% purity which were irradiated as foils 1000 to 2000A thick were investigated by transmission electron mieroscopy. All specimens were sealed in evacuated quartz tubes and irradiated in the Brookhaven Reactor. The same areas were examined at magnifications between 40,000x and 65,000x before and after irradiation with an integrated flunx of 10/sup 16/ or 10/sup 19/ nvt. (W.D.M.)
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H.G.F. Wilsdorf (1959) studied this question.
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