碳化硼中硼同位素质谱测定

MASS SPECTROMETRIC DETERMINATION OF BORON ISOTOPE IN BORON CARBIDE

一、前言碳化硼在核反应堆的控制棒中通常被用作核燃料的可燃毒物和中子吸收体。这是由^(10)B同位素提供了此特性;另外^(10)B同位素丰度是碳化硼产品出口的一个重要指标。因此,对硼同位素的测定具有重要意义。

Boron isotopes are measured in boron carbide by thermionic ionization mass spectrometry with no prior chemical separation.Boron is converted to sodium borate by fusion of the boron carbide with sodium hydroxide (or sodium carbonade) directly on the rhenium filament. The boron isotopic ratios are measured using the Na_2BO_2^+ion.