EFFECTS OF NEUTRON-INDUCED GAS FORMATION ON BERYLLIUM
Specimens of beryllium which had received neutron irradiations up to an integrated fast flux of 10/sup 22/ nvt were examined after annealing at various temperatures. For beryllium which had received the maximum irradiation, the annealing treatments have resulted in significant decreases in over-all density of the beryllium specimens, the density decrease being 0.8% and 20% after annealing individual specimens for one hour at 595 deg C and 995 deg C, respectively. The quantity of neutron-induced gases contained in the beryllium was shown to be approximately 23 cm/sup 3/ gas per cm/sup 3/ metal for the integrated fast flux of 10/sup 22/ nvt. Analysis of the gas shows that it is mainly He/sup 4/. Metallographic evidence confirms that the density decreases are a direct result of void formation in the metal; it is concluded that the voids confirm He/sup 4/ at pressures high enough to cause growth of the voids at the annealing temperatures. The detailed results of the constituent analysis of the neutron-induced gas confirm that the greater part of the gas arises from the (n,2n) capture reaction on beryllium. (auth)
- Research Organization:
- Atomic Energy of Canada, Ltd., Chalk River, Ont.
- NSA Number:
- NSA-13-015409
- OSTI ID:
- 4251200
- Journal Information:
- J. Nuclear Materials, Journal Name: J. Nuclear Materials Vol. Vol: 1
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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