cosmogenic dating lab

Eleanor Steele, 40 years old

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Take the virtual tour of the Cosmogenic Nuclide Lab. Because we know the rates at which these isotopes are produced, the concentrations of cosmogenic nuclides in rock, soil, sediment, etc. The facilities include 2 HF rated extraction hoods and one laminar flow hood, Parr pressure dissolution oven, as well as analytical balances and centrifuge. The applications of cosmogenic nuclide methods span the Earth Sciences. Absolute dating of glacial moraines and river terraces, for example provide vital constraints on paleo-climate impacts on the landscape. Cosmogenic nuclides can be used to date fault scarps and the occurrence of large landslides, helping us understand tectonics and earthquake hazards and recurrence intervals. Soil production rates and erosion rates can likewise be determined by measuring cosmogenic dating lab concentrations in soils or river sediment, respectively, providing constraints of soil sustainability and flood hazard.

Keir studies the previous extent and subsequent retreat of the Antarctic Ice Sheet using the cosmogenic nuclide 14 C. This allows us to quantify the contribution cosmogenic dating lab the ice sheet to past sea level rise, and thus constrain climate models. Keir is working towards furthering our understanding of the accumulation of cosmogenic nuclides in Norway. In his spare time, he enjoys travelling, hiking, live music and supporting the great Stoke City Football Club. Rachel studies the uplift and glacial history of the Alaska Range using cosmogenic nuclide dating. Rachel grew up in southeast Michigan and received a B. In her free time, she enjoys camping, board games, reading and baking adventures.

The laboratory doubles as a dark room for the preparation of silver salts. The laboratory has a scrubbed fume hood for the use of hydrofluoric acid in rock digestion. The cosmogenic nuclide sample preparation laboratory is used for the initial pre-treatment of rock samples prior to digestion in the Be or Cl clean labs. The laboratory is equipped with a scrubbed fume hood, a standard fume hood, a multi-sample heated ultrasonic bath, and heavy-media separation equipment.
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The facility brings the capabilities to prepare targets and mineral separates for 10 Be and 3 He dating in support of earth science. Our lab prepares 10 Be samples for cosmogenic dating lab isotope analysis by accelerator mass spectrometry. We are set up to take 10 Be samples from hand sample to cathode in our facility. Beryllium extraction from the quartz takes place in a separate clean room. Targets are processed at the Lawrence Livermore National Laboratory accelerator.

Surface exposure dating is a collection of geochronological techniques for estimating the length of time that a rock has been exposed at or near Earth's surface. Surface exposure dating is used to date glacial advances and retreatserosion history, lava flows, meteorite impacts, rock slides, fault scarpscave development, and other geological events. It is most useful for rocks which have been exposed for between 10 years and 30, years [ citation needed ]. The most common of these dating techniques is Cosmogenic radionuclide dating [ citation needed ]. Earth is constantly bombarded with primary cosmic rayshigh energy charged particles — mostly cosmogenic dating lab and alpha particles.

High-energy cosmic rays shower the Earth's surface, penetrating meters into rock and producing long-lived radionuclides such as Cl, Al and Be Production rates are almost unimaginably small - a few atoms per gram of rock per year - yet we can detect and count these "cosmogenic isotopes" using accelerator mass spectrometry, down to levels of a few thousand atoms per gram parts per billion of parts per billion! The build-up of cosmogenic isotopes through time provides us with a way to measure exposure ages for rock surfaces such as fault scarps, lava flows and glacial pavements. Where surfaces are gradually evolving, cosmogenic isotope measurements allow us to calculate erosion or soil accumulation rates. This site explains some of the background to our work and provides an overview of cosmogenic isotope research at the University of Washington. It also serves as a repository for data generated by the group, descriptions of our lab procedures, technical information and calculation methods. This web site is partially supported by grants from the National Science Foundation.
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