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Date: 5-12-2018
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Date: 9-10-2018
1075
Date: 31-1-2018
978
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Tritium
Tritium occurs in the upper atmosphere and is formed naturally by reaction 1.1, involving neutrons arriving from outer space. Tritium (see Section 2.8) was first obtained synthetically by the bombardment of deuterium compounds such as [ND4]2SO4 with fast neutrons, but is now prepared from lithium deuteride, LiF or Mg/Li enriched in 63 Li (equation 1.2).
(1.1)
(1.2)
Tritium is radioactive, a weak b-emitter with t1/2= 12.3 yr. It is used extensively as a tracer, in both chemical and biochemical studies; its weak radioactivity, rapid excretion and failure to concentrate in vulnerable organs make it one of the least toxic radioisotopes.
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دراسة يابانية لتقليل مخاطر أمراض المواليد منخفضي الوزن
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اكتشاف أكبر مرجان في العالم قبالة سواحل جزر سليمان
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اتحاد كليات الطب الملكية البريطانية يشيد بالمستوى العلمي لطلبة جامعة العميد وبيئتها التعليمية
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