It was made possible by the development of mass spectrometers during the 1920s and their use in geochronological laboratories for radiometric dating (see above).
210Pb activity was measured for samples from core 050310-C6 usingammama spectrometry at the Leibniz-Laboratory for Radiometric Dating and Isotope Research (Kiel, Germany).
Such a program would allow for recoverable instruments that could be periodically intercompared with the absolute radiometric standards in the laboratory and thereby provide long term measurement assurance for space based radiometry.
Although radiometric dating requires very careful laboratory work, its basic principle is simple: the rates at which various radioactive elements decay are known, and so the ratio of the radioactive element to the element into which it decays shows how long ago the radioactive element was incorporated into the rock.
Internationally, OTD has been actively participating in the intercomparisons with other national standard laboratories in the measurement of SI traceable radiometric quantities.
The spectral, radiometric, and spatial calibrations of AVIRIS are determined in the laboratory and validated in flight.
Because of uncertainty in the smear correction for the laboratory measurements, we use the star measurements for the radiometric calibration.
Serum IGF1 concentration was measured around 7.00 to 8.00 am before breakfast in 184/216 children using an immune-radiometric assay after ethanol-acid extraction using DSL-5600 Active (Diagnostic System Laboratories, Webster, TX, USA) or Cisbio reagents (Cisbio International, Codolet, France ).
Susceptibility testing was performed by using BACTEC 460 radiometric culture system (Becton Dickinson, Sparks, MD, USA), at the hospital or reference laboratories supplying isolates to the HTI (14 ).
Before LC-MS/MS analysis, each radiotracer was also analyzed by the calibrated radiometric method (activity using an ionization chamber dose calibrator and mass using HPLC apparatus) regularly used in our laboratory for quality control.
