关键词: 氩同位素, 样品管, 改造

Abstract: While testing capability of mass spectrometer has been improved, sample fusion system becomes the main factor to effect Ar isotopes determination. Sample tube has been reconstructed from mono tube to multiple tube. After reconstruction, it allowes us to remove atmosphere Ar and measure hot blank beforehand. This reduces the influence of non radiogenic Ar to measuring results,which plays an important role especially to young volcanic rocks. Moreover, measuring time is saving. The second change that has made is quartz tube from cylinder shape to three pinstripe. Quartz material contacted to the molybdenum crucible reduces to one fifth. This makes hot blank even lower and the removal time is shorter. After modification of sample tube, the content of radiogenic Ar increases and reproducibility and accuracy of standards is better.

Key words: Ar isotope, sample tube, modification