| 21. | In addition to the regular fuel assemblies, there are instrumented ones, containing neutron flux detectors in the central carrier.
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| 22. | The neutron flux involved may be on the order of 10 22 neutrons / ( cm 2 �second ).
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| 23. | The High Flux Isotope Reactor built in 1965 with the highest neutron flux of any reactor at the time.
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| 24. | The sources are therefore positioned so the neutron flux they produce is always detectable by the reactor monitoring instruments.
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| 25. | Historians can use accidental neutron activation to authenticate atomic artifacts and materials subjected to neutron fluxes from fission incidents.
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| 26. | The latter isotope is produced instead in a process where 239 Pu captures four neutrons under high neutron flux:
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| 27. | Within a nuclear fission reactor the neutron flux is primarily the form of measurement used to control the reaction inside.
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| 28. | The sample and a standard are then packaged and irradiated in a suitable reactor at a constant, known neutron flux.
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| 29. | Polonium may now be made in milligram amounts in this procedure which uses high neutron fluxes found in nuclear reactors.
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| 30. | These holes allow inserting special holders containing flux wires into the core, to obtain neutron flux maps of the core.
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