The key difference between plutonium-239 and uranium-235 is that plutonium emits fewer delayed neutrons than uranium when it undergoes fission.
22.
The beta decay half lives for the precursors to delayed neutron-emitter radioisotopes, are typically fractions of a second to tens of seconds.
23.
The average neutron lifetime considering delayed neutrons is approximately 0.1 sec, which makes the chain reaction relatively easy to control over time.
24.
Samples of smears, vegetation, soil, rock, plastics, wood, metal, and sand are equally amenable to delayed neutron analysis.
25.
The CAESAR reactor design exploits the fact that the fission products and daughter isotopes produced via nuclear reactions also decay to produce additional delayed neutrons.
26.
For low enriched uranium fuel working on a thermal neutron spectrum, the difference between the average and effective delayed neutron fractions can reach 50 pcm.
27.
While most of germanium's radioisotopes decay by beta decay, 61 Ge and 64 Ge decay by ? " delayed neutron emission decay paths.
28.
For every 1000 neutrons released by fission, 7 are delayed neutrons which are emitted from the fission product precursors, called " delayed neutron emitters ".
29.
For every 1000 neutrons released by fission, 7 are delayed neutrons which are emitted from the fission product precursors, called " delayed neutron emitters ".
30.
The PT-2 facility offers a highly thermalized flux coupled with delayed neutron counting, giving the ability to measure very low quantities of fissile materials in minutes.
