铬酸铯，即铬酸的铯盐，与硅、硼或钛等还原剂作用可制得铯蒸汽，这也是制作真空管的最后步骤。铯蒸汽与剩余的气体（氮气、氧气）等反应，最终除去管内的气体。

Caesium chromate, the caesium salt of chromic acid, is used to produce caesium vapour by reaction with silicon, boron, or titanium, which is used to in the final stages of creating vacuum tubes; the caesium vapour reacts with the remaining gases, including nitrogen and oxygen.