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- W14241485 abstract "In order to provide reliable protection of operating personnel against induced radiation, steps must be taken to reduce the induced BETA and gamma activities in materials exposed to the beam of symchrocyclotrons and similar devices. This may be achieved by improving the focusing of the beam on the target and attenuation of scattered particle beams by materials which are activated only slightly or form only short-lived isotopes. a study was therefore undertaken for the purpose of determining which materials satisfy the second condition when exposed to a 660-Mev proton beam. The specimnens which included Be, graphite, Mg, duraluminum, vitreous silica, porcelain, concrete, heavy concrete, ordinary and stainless steel. Cu, brass, and oxides of Ni, Ti, Cr, and Mn, were irradiated for 40 minutes in an external beam of the synchrocyclotron, with a dose rate between 2 x 10/sup 8/ to 2 x 10/sup 9/ protons/cm/sup 2/ sec, supplementary irradiations were carried with the inner beam reaching a level of 10/sup 10/ protons/cm/sup 2/ sec. It was found 1 hour after the termination of the exposure the specific activities of materials varied from 15 to 700 mg equival. Ra/g. Similar measurements carried out 1000 hours after the irradiation yielded activities rangingmore » from 0.4 to 250 mg equivalent Ra/g. Under these conditions, the gamma dose rate of the lightmetal (Al. Mg) alloys was found to be 2 to 7 times less than that of the heavy-metal alloys, containing Fe or Cu. In the case of light metals, activation of the impurities plays an important role. A good agreement was found between theoretical and experimental data. (TTT)« less" @default.
- W14241485 created "2016-06-24" @default.
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- W14241485 date "1963-08-01" @default.
- W14241485 modified "2023-09-24" @default.
- W14241485 title "ACTIVATION OF VARIOUS MATERIALS BY IRRADIATION WITH 660-Mev PROTONS" @default.
- W14241485 hasPublicationYear "1963" @default.
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