210Pb Dating and Individual Assays for Gamma Ray Emitting RadioIsotopes


   It is well known in the research community that gamma spectrometers have a dramatic range of efficiency across its 2000 keV spectrum. Our gamma spectrometer is calibrated for efficiency using reference materials from the International Atomic Energy Agency to provide the most accurate measurements possible. Our data computations are done on a specially developed software program from ScienTissiME. The program takes into account efficiencies, self attenuation corrections, self absorption corrections, cascade corrections and many others.

   When our gamma counter is not in use by our members, we offer our 210Pb dating methods,  and measurements for individual assays to other researchers in various universities, companies, government and private groups. All of our work is done on site using non-destructive methods. Measurements are done by digital gamma ray spectroscopy. We employ up to 4 dating models to provide users with the best possible dating scenarios for their sediment core profiles.

•    CRS = constant rate of supply

•    CIC = constant initial concentration

•    Cs = 137Cs

•    CFCS = constant flux constant sedimentation rate

   Individual assay measurements are analyzed and interpretted with our  specially calibrated system to provide efficiency corrected concentrations.

                                     (Image by E.Kruemmel)


If you are interested in submitting samples for 210Pb dating or for individual assays of gamma emitting isotopes, please contact Linda Kimpe at:


Tel: 613-562-5800 ext 6668

Linda E. Kimpe, Lab Manager / Analyst

   My training is in freshwater ecology, anatomy and fish biology, but over the years I have added in gamma spectroscopy, and organic & analytical chemistry for persistent pollutants. I have extensive field work experience in remote locations, multiple certifications for safety, and over 20 years of 210Pb dating experience via alpha and gamma spectroscopy.

   My role in the lab is to develop lab methods and train graduate students in extraction and analytical techniques for their research. I plan and participate in some of our remote field collections. As well, I develop analytical methods, and maintain the analytical equipment in our lab, some of which are part of the LANSET facility at the University of Ottawa.

David Eickmeyer, MSc, Technician


   My background was originally in marine and freshwater biology, but I have now moved into environmental organic contaminant analysis, primarily focusing on persistent pollutants and polycyclic aromatic hydrocarbons. My main role in the lab is contaminant sample extraction and analysis, as well as occasionally assisting graduate students as a problem-solving consultant! I also help plan, prepare and participate in some of our northern field sampling trips.