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The Advanced Molybdenum-based Rare process Experiment in its second phase(AMoRE-II) will search for neutrinoless double-beta (0{\nu}\b{eta}\b{eta})decay of 100Mo in 200 kg of molybdate crystals. To achieve the zero-backgroundlevel in the energy range of the double-beta decay Q-value of 100Mo, theradioactive contamination levels in AMoRE crystals should be low. 100EnrMoO3powder, which is enriched in the 100Mo isotope, is used to grow the AMoREcrystals. A shielded array of fourteen high-purity germanium detectors with 70%relative efficiency each was used for the measurement of background activitiesin a sample of 9.6-kg powder. The detector system named CAGe located at theYangyang underground laboratory was designed for measuring low levels ofradioactivity from natural radioisotopes or cosmogenic nuclides such as 228Ac,228Th, 226Ra, 88Y, and 40K. The activities of 228Ac and 228Th in the powdersample were 0.88 \pm 0.12 mBq/kg and 0.669 \pm 0.087 mBq/kg, respectively. Theactivity of 226Ra was measured to be 1.50 \pm 0.23 mBq/kg. The activity of 88Ywas 0.101 \pm 0.016 mBq/kg. The activity of 40K was found as 36.0 \pm 4.1mBq/kg.

nuclear instruments and methods in physics research section a accelerators spectrometers detectors and associated equipment

Measurement of the Background Activities of a 100Mo-enriched Powder  Sample for an AMoRE Crystal Material by using Fourteen High-Purity Germanium  Detectors