We have prepared an artificial mixture of 3He and 4He to be used as an internal standard for precise 3He/4He measurements of terrestrial mantle-derived samples. The mixture is named HESJ (He Standard of Japan). The 3He/4He ratio of HESJ was determined by obtaining the weighted average of repeated analyses from five machines in four laboratories in Japan. The recommended value of the 3He/4He ratio of HESJ relative to the air value (R/Ra) is 20.63±0.10. HESJ is available to all researchers.
All Science Journal Classification (ASJC) codes
- Geochemistry and Petrology