A low-background image-coincidence spectrometer for radioisotope studies

Andrew Tillett, John Dermigny, Mark Emamian, Yuri Tonin, Igal Bucay, Rachel L. Smith, Michael Darken, Corey Dearing, Mikaela Orbon, Christian Iliadis

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 871, 1 November 2017, Pages 66-71
Available online 5 August 2017


“The performance of a new, low-background NaI(Tl) spectrometer, based on -coincidence counting, is discussed. We present experimental coincidence efficiencies, timing resolutions, background count rates, and minimum detectable activities. The spectrometer has been simulated using Geant4, and the results are used for estimating coincidence efficiencies for volume sources. To test the device, we measured the cosmogenic activity in a small (17.7 g) meteorite fragment. We find a value of , in agreement with the activity measured previously in a much larger fragment of the same meteorite using a HPGe detector.”