Caltech Noble Gas Lab: Pfeiffer Prisma Quadrupole


We use a Pfeiffer Prisma quadrupole mass spectrometer in conjunction with a Photon Machines diode laser to perform helium analyses for (U-Th)/He chronometry. We use a pure helium-3 spike, calibrated against a helium-4 standard, for isotope dilution. This system provides high throughput and adequate precision for thermochronology.