Rights statement: This is the author’s version of a work that was accepted for publication in Cryogenics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Cryogenics, 18, 4, 1978 DOI: 10.1016/0011-2275(78)90002-4
Submitted manuscript, 1.07 MB, PDF document
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - An apparatus for preparing isotopically pure 4He
AU - McClintock, Peter V. E.
N1 - This is the author’s version of a work that was accepted for publication in Cryogenics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Cryogenics, 18, 4, 1978 DOI: 10.1016/0011-2275(78)90002-4
PY - 1978/4
Y1 - 1978/4
N2 - 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.
AB - 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.
U2 - 10.1016/0011-2275(78)90002-4
DO - 10.1016/0011-2275(78)90002-4
M3 - Journal article
VL - 18
SP - 201
EP - 208
JO - Cryogenics
JF - Cryogenics
SN - 0011-2275
IS - 4
ER -