A compact, all-metal, multi-stage thermal diffusion apparatus for the separation of isotopes in quantity in non-corrosive gases at any pressure up to 175 lb/in.2 is described. For a particular gas the proper pressure may be well-enough calculated in advance as that giving maximum separation factor in the last column only. Operating with neon at 3 atmos. pressure, and using 12 meters of column consuming 4.9 kw for 260 hours, 7 liters of gas with a Ne22 content of 93.4 percent were produced.
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Watson et al. (1949) studied this question.
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