Neutron activation analysis of the 30Si content of highly enriched 28Si: proof of concept and estimation of the achievable uncertainty

被引：5
|
作者：
D'Agostino, G. [1 ]
Mana, G. [2 ]
Oddone, M. [3 ]
Prata, M. [4 ]
Bergamaschi, L. [1 ]
Giordani, L. [1 ]
机构：
[1] Univ Pavia, Dept Chem, Unit Radiochem & Spect, Ist Nazl Ric Metrol INRIM, I-27100 Pavia, Italy
[2] Ist Nazl Ric Metrol INRIM, I-10135 Turin, Italy
[3] Univ Pavia, Dept Chem, I-27100 Pavia, Italy
[4] Univ Pavia, LENA, I-27100 Pavia, Italy
来源：
METROLOGIA | 2014年 / 51卷 / 03期
关键词：
neutron activation analysis; Avogadro constant; isotopic composition; MOLAR-MASS; SI-28-ENRICHED SILICON; AVOGADRO CONSTANT; CRYSTAL;
D O I：
10.1088/0026-1394/51/3/354
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
We investigated the use of neutron activation to estimate the Si-30 mole fraction of the ultra-pure silicon material highly enriched in Si-28 for the measurement of the Avogadro constant. Specifically, we developed a relative method based on instrumental neutron activation analysis and using a natural-Si sample as a standard. To evaluate the achievable uncertainty, we irradiated a 6 g sample of a natural-Si material and modelled experimentally the signal that would be produced by a sample of the Si-28-enriched material of similar mass and subjected to the same measurement conditions. The extrapolation of the expected uncertainty from the experimental data indicates that a measurement of the Si-30 mole fraction of the Si-28-enriched material might reach a 4% relative combined standard uncertainty.
引用
收藏
页码：354 / 360
页数：7
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