The Advanced Molybdenum-based Rare process Experiment (AMoRE) in its second phase will search for neutrinoless double-beta ($0\nu \beta \beta$) decay of ¹⁰⁰Mo in 200 kg of molybdate crystals. To achieve the zero-background level in the energy range of the double-beta decay Q-value of ¹⁰⁰Mo, the radioactive contamination levels in AMoRE crystals should be low. Enriched molybdenum trioxide powder, ${}^{\mathrm{100Enr}}$MoO₃, enriched to 95.73% abundance of the ¹⁰⁰Mo isotope is used to grow the AMoRE crystals. A shielded array of fourteen high-purity germanium detectors with 70% relative efficiency each was used for the measurement of background activities in a sample of 9.6-kg powder. The detector system named the CAGe located at the Yangyang underground laboratory was designed for measuring low levels of radioactivity from natural radioisotopes or cosmogenic nuclides such as ²²⁸Ac, ²²⁸Th, ²²⁶Ra, ⁸⁸Y, and ⁴⁰K. The activities of ²²⁸Ac and ²²⁸Th in the powder sample were 0.88 $\pm$ 0.13 and 0.669 $\pm$ 0.089 mBq/kg, respectively. The activity of ²²⁶Ra was measured to be 1.19 $\pm$ 0.42 mBq/kg. The activity of ⁸⁸Y was 0.101 $\pm$ 0.016 mBq/kg. The activity of ⁴⁰K was found as 36.0 $\pm$ 4.1 mBq/kg.

第二阶段的高级基于钼的稀有过程实验（AMoRE）将搜索无中微子双β（$0\nu \beta \beta$）的衰减¹⁰⁰在200公斤钼酸晶体沫。为了在双β衰变Q值¹⁰⁰ Mo的能量范围内达到零背景能级，AMoRE晶体中的放射性污染度应低。浓缩三氧化钼粉，${}^{\mathrm{100Enr}}$富集到¹⁰⁰ Mo同位素的95.73％丰度的MoO ₃用于生长AMoRE晶体。屏蔽阵列由十四个高纯度锗检测器组成，每个检测器的相对效率为70％，用于测量9.6千克粉末样品中的背景活性。命名位于扬扬地下实验室笼子里的检测器系统被设计用于从天然放射性同位素或宇宙核素如测量放射性水平低²²⁸ AC，²²⁸ Th时，²²⁶镭，⁸⁸ Y，和^40个的K.活动²²⁸ Ac和粉末样品中的²²⁸ Th为0.88 $\pm$ 0.13和0.669 $\pm$ 分别为0.089 mBq / kg。测得²²⁶ Ra的活性为1.19 $\pm$ 0.42立方英尺/千克 ⁸⁸ Y的活度为0.101 $\pm$ 0.016 mBq /千克 发现⁴⁰ K的活性为36.0 $\pm$ 4.1立方英尺/千克。