Half-life of 238PuThe half-life of 238Pu has been measured by determining its rate of growth from 242Cm. The weighted average of two determinations is 86·41 years, with an estimated error of 0·3 year.doi:10.1016/0022-1902(57)80075-XDarleane C. Hoffman...
放射性是 ☢️ Half Life7.93×107 Lifetime1.14×108y DecayAlpha Emission 同位素 标志Mass NumberRelative Atomic MassIsotopic Composition 228Pu228228.038740(30) 229Pu229229.040150(60) 230Pu230230.039650(16) 231Pu231231.041101(28) 232Pu232232.041187(19) ...
both ratios declined with a half-life of approximately 5.6 months. The observed temporal changes of the ratios were likely caused by the upper-stratospheric input of nuclear debris from high-yield atmospheric nuclear weapon testing during 1961–62, followed by its downward transport to the tropospher...
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Concentrations of 239Pu, 240Pu, and 241Am, and atomic ratio of 240Pu/239Pu in freshly fallen snow on Mt. Zugspitze collected in 2014, 2015 and 2016 were determined by accelerator mass spectrometry (AMS). For the sub-femtogram (10−15 g) - level of Pu a
A half-life value of (3.742+/-0.024) × 10yr is obtained using the half-life of Pu as 24110 yr. The value obtained using the half-life of Pu as 87.74 yr is (3.766+/-0.025) × 10yr. The average of these two independent sets of experiments leads to a half-life value of Pu as...
By studying the growth of the gamma activity of the daughter Am-241 in a xenon-filled proportional counter, a value of 12·95 ± 0·28 years was obtained. (See note added in proof.)doi:10.1016/0891-3919(55)90043-7B. RoseJ. MilstedElsevier B.V.Journal of Nuclear Energy...
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The plutonium isotope 238Pu is an alpha emitter with a half life of 87 years. These characteristics make it well suited for electrical power generation for devices which must function without direct maintenance for timescales approximating a human life time. It is therefore used in RTGs such as ...
A half-life systematics for fission isomers based on isomers reported in the literature and on isomers measured in the present work is presented. Odd-even effects on the spontaneous fission half-lives and the existence of excited states in the second potential well are discussed. 展开 ...