Our workhorse helium isotope and tritium measurement mass spectrometer system (MS1). This instrument was first designed and built in 1975, and has evolved, grown, and been modernized over the years. It is fully automated and runs 24/7. The larger stainless steel cylinders near the bottom/center of the picture are the cryogenic traps that are used to transfer and purify He and Ne. The magnetic sector mass spectrometer (middle, right) analyzes the helium isotopes, while the QMS (lower right) previews samples and measures He and Ne. The automanifold (left) allows the "mounting" of up to 32 samples for measurement and unattended operation.