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An apparatus for preparing isotopically pure 4He.

McClintock, Peter V. E. (1978) An apparatus for preparing isotopically pure 4He. Cryogenics, 18 (4). pp. 201-208. ISSN 0011-2275

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Abstract

A cryostat has been constructed for extracting pure He4 from He II of natural isotopic composition by means of a heat flush technique. It is shown that the method is in principle capable of yielding He4 which is entirely devoid of He3 isotopic impurities. A secondary heat flush, operated in conjunction with a conical heat exchanger of novel design, was used to place an experimental lower bound of 2 × 1015 on the ratio of the product, a standard sufficient for all present or projected applications requiring isotopically pure He4. The apparatus produces 2 000 1 (at standard temperature and pressure) of He4 per thermal cycle. The design of future purifiers is discussed.

Item Type: Article
Journal or Publication Title: Cryogenics
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 32504
Deposited By: Professor P. V. E. McClintock
Deposited On: 12 Apr 2010 10:21
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 17:11
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/32504

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