铼参考样品的绝对同位素丰度比和原子量。
Absolute Isotopic Abundance Ratio and Atomic Weight of a Reference Sample of Rhenium.
作者信息
Gramlich John W, Murphy Thomas J, Garner Ernest L, Shields William R
机构信息
Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234.
出版信息
J Res Natl Bur Stand A Phys Chem. 1973 Nov-Dec;77A(6):691-698. doi: 10.6028/jres.077A.040.
Abstract
An absolute value has been obtained for the isotopic abundance ratio of a reference sample of rhenium, using surface emission mass spectrometry. Samples of known isotopic composition, prepared from nearly isotopically pure separated rhenium isotopes, were used to calibrate the mass spectrometers. The resulting absolute Ke/Re ratio is 0.59738±0.00039, which yields atom percents of Re = 37.398±0.016 and Re = 62.602±0.016. The atomic weight calculated from this isotopic composition is 186.20679±0.00031. The indicated uncertainties are overall limits of error based on 95 percent confidence limits for the mean and allowances for the effects of known sources of possible systematic error.
摘要
使用表面发射质谱法获得了铼参考样品的同位素丰度比的绝对值。由几乎同位素纯的分离铼同位素制备的已知同位素组成的样品用于校准质谱仪。所得的绝对(^{185}Re/^{187}Re)比值为(0.59738±0.00039)，由此得出(^{185}Re)的原子百分数为(37.398±0.016)，(^{187}Re)的原子百分数为(62.602±0.016)。根据该同位素组成计算出的原子量为(186.20679±0.00031)。所示的不确定度是基于平均值的95%置信限以及已知可能系统误差源影响的余量得出的总误差限。
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