Abstract
Abstract An underground counting laboratory designed for low-level gamma- and beta-ray spectrometry of anthropogenic and natural radionuclides in environmental samples has been constructed at the depth of 35 m water equivalent (w.e.) at the IAEA’s Marine Environment Laboratory in Monaco. The laboratory is equipped with 4 large volume HPGe detectors placed in a common lead shield with anti-cosmic plastic scintillator shielding, a coincidence–anticoincidence gamma-ray spectrometer, comprising an HPGe detector and NaI(Tl) shielding, a HPGe–HPGe telescope (sandwich) detector system, and a Quantulus liquid scintillation spectrometer. The laboratory design is presented and performance of the gamma-ray spectrometers under different coincidence–anticoincidence modes of operation are discussed. The anti-cosmic shielding has proved to be a valuable investment as the backgrounds of HPGe detectors operating at shallow depths are comparable with backgrounds of detectors placed in laboratories operating at moderate depths of about 250 m w.e.
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