有一个科学术语叫做半衰期(half life)。例如,铀238的半衰期约为45亿年,意思就是,每过45亿年,一个U-238原子核会有一半的概率衰变。有一个著名的射击游戏叫做《半条命》,其实这个游戏的英文名是half life,本意就是“半衰期”,所谓“半条命”实际上是望文生义的误译。为了帮助大家理解这个概念,美国韦尔斯利学院(...
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What is the half life of uranium? The half-life of uranium-238 is 4.5 billion years. It is one of the three natural occurring uranium isotopes, along with uranium-235 (700 million years), and uranium-234 (246,000 years). Related calculators Initial quantity (N(0)) Half-life time ...
U/U activity ratios as a probe for the U/U half-life ratio High-resolution alpha-particle spectrometry was performed on three uranium materials enriched in U. Besides the U peaks, separate peaks belonging to impuri... S. Pommé,E. García-Tora?o,G. Sibbens,... - 《Journal of Radioanal...
Define half-life. Define dating. Calculate age of old objects by radioactive dating. Unstable nuclei decay. However, some nuclides decay faster than others. For example, radium and polonium, discovered by the Curies, decay faster than uranium. This means they have shorter lifetimes, producing a...
As part of an inter-laboratory effort, the half life of 239Pu has been measured on a shared 239Pu metal material. Grown-in daughter 235U was measured after intervals of 1.4 and 1.7 yr by isotope dilution mass spectrometry. The detemined half life is 24,164yr with an associted standard ...
Uranium-235 (U-235), radioactive isotope of the element uranium with a nucleus containing 92 protons and 143 neutrons. Uranium-235 is the only naturally occurring fissile material; that is, the uranium-235 nucleus undergoes nuclear fission when it collid
As an intermediate link, the 234U/238U half-life ratio was taken from published mass spectrometric analyses of 'secular equilibrium' uranium material. The resulting half-life ratio T 1/2(238U)/T 1/2(235U) = 6.351±0.031 is in agreement with the commonly adopted half-life values determined...
X-ray photoelectron spectra of uranium and uranium oxides. Correlation with the half-life of 235Um. Uranium metal and the uranium oxides UO2, U3O8, UO3 are studied by photoelectron spectroscopy. Chemical shifts of the 4f electronic cor J Verbist,J Riga,J Pireaux,... - 《Journal of Electr...
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