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The SHRIMP-RG is at Stanford University as a result of a partnership between the U.S. Geological Survey and Stanford School of Earth, Energy & Environmental Sciences. The laboratory has been jointly operational since 1998, supporting scientists and students from the USGS, Stanford, and external visitors from around the world who visit the laboratory to analyze specimens for a variety of scientific research objectives.

We are committed to making SHRIMP-RG available to the scientific community and seek projects that require spatially resolved measurements and benefit from SHRIMP-RG's unique combination of high secondary transmission and high mass resolving power.



All U-Th-Pb and trace element data produced by SHRIMP-RG that has been reduced in SQUID-1 or SQUID-2 is now suitable for upload to This is important for data management, archiving, and optional release of data aquired during NSF-supported research. Please download the instructions for online submission here.

To request for instrument time on SHRIMP-RG, please click on the 'Request Form' on the banner. Currently, we are scheduling ~6 months in advance.

                          A new upgrade to our Faraday electrometer (white box above), which has 1010, 1011, and 1012 ohm resistors and can be operated in resistive or charge modes, significantly increases the dynamic range of the detectors on SHRIMP-RG. iFlex allows the Faraday cup-electrometer combination to be used on much lower signals than a conventional high gain electrometer, thereby overcoming the ‘megaHertz gap’ between signals too high for an electron multiplier (> 100 kHz) and too low for a conventional electrometer (< 1 MHz). Although SHRIMP-RG is still a single collector instrument, small signals can still be measured on the electron multiplier, whereas larger signals can be measured on the Faraday cup. New software upgrades allows the acquisition table to switch dynamically between detectors.

New upgrades to the SHRIMP-RG magnet, software, and hardware occurred during April, 2015. This improvement has enhanced magnet stability and allows higher resolution mass scans that improve our ability to distinguish interfering peaks in the mass spectra, particularily at low mass.