High-resolution gamma-ray spectrometry is widely used for identifying and assaying gamma-ray emitting radionuclides in environmental samples. To meet the requirements of quality management systems, the spectrometers should be calibrated using reference sources that are traceable to national standards. The reference sources must also match as closely as possible the geometry, density, and composition of the sample to be assayed. This range of ready-for-use geometry reference sources has been developed to meet these requirements.
