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Date: 26-3-2017
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Date: 16-12-2020
1740
Date: 5-4-2017
1995
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Other Neutron Poisons
There are numerous other fission products that, as a result of their concentration and thermal neutron absorption cross section, have a poisoning effect on reactor operation. Individually, they are of little consequence, but "lumped" together they have a significant impact. These are often characterized as "lumped fission product poisons" and accumulate at an average rate of 50 barns per fission event in the reactor.
In addition to fission product poisons, other materials in the reactor decay to materials that act as neutron poisons. An example of this is the decay of tritium to helium-3. Since tritium has a half-life of 12.3 years, normally this decay does not significantly affect reactor operations because the rate of decay of tritium is so slow. However, if tritium is produced in a reactor and then allowed to remain in the reactor during a prolonged shutdown of several months, a
sufficient amount of tritium may decay to helium-3 to add a significant amount of negative reactivity. Any helium-3 produced in the reactor during a shutdown period will be removed during subsequent operation by a neutron-proton reaction.
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اكتشاف تأثير صحي مزدوج لتلوث الهواء على البالغين في منتصف العمر
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زهور برية شائعة لتر ميم الأعصاب التالفة
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جمعيّة العميد وقسم الشؤون الفكريّة تدعوان الباحثين للمشاركة في الملتقى العلمي الوطني الأوّل
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الأمين العام المساعد لجامعة الدول العربية السابق: جناح جمعية العميد في معرض تونس ثمين بإصداراته
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المجمع العلمي يستأنف فعاليات محفل منابر النور في واسط
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برعاية العتبة العباسيّة المقدّسة فرقة العبّاس (عليه السلام) تُقيم معرضًا يوثّق انتصاراتها في قرية البشير بمحافظة كركوك
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