Abstract
A high-speed chemical technique is described for separating antimony, arsenic and germanium from fission products. The hydrides of these elements are formed inside a nuclear reactor by the Zn + H 2SO 4 reaction and are swept out by a fast gas flow. Further studies have been made of delayed neutron emission from fission product isotopes of Sb and As formed in the thermal neutron fission of 235U; the half-lives and delayed neutron yields are in good agreement with those measured in an earlier study using an electrolytic technique. The weighted average values from the two studies are as follows: half-lives (sec), 85,86As 2·028 ± 0·012, 134Sb 11·3 ± 0·3, 135Sb 1·696 ± 0·021; absolute delayed neutron yields (neutrons/10 4 fissions), 85,86As 9·7 ± 0·8, 134Sb 0·028 ± 0·004, 135Sb 3·5 ± 0·3. A search for other delayed neutron precursors of Sb, As and Ge with half-lives down to 0·5 sec gave negative results.
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