Abstract Samples of space objects were characterized using instrumental neutron activation analysis (NAA) combined with conversion electron Mossbauer spectrometry. Fragments of Moldavites, Muonionalusta meteorite and Sikhote-Alin meteorite were irradiated in the thermal neutron field of the low-power VR-1 training reactor operated by the Czech Technical University in Prague. Activated samples were investigated by means of nuclear gamma-spectrometry technique (semiconductor HPGe detector). Qualitative analysis revealed the occurrence of Na, Al, Mg, Cl, K, Ti, V, Mn, Fe, Sr, and Ba in Moldavites, Na, Cl, Mn, Fe, Co, Cu, Ni, As, and Au in Muonionalusta iron meteorite, and Ni, Co, Fe, and Mn in Sikhote-Alin iron meteorite. Employing the comparative NAA, the concentration of Na, Al, K, Ti, V, Fe, and Sr in Moldavite, concentration of Na, Fe, Ni, and Au in Muonionalusta meteorite, and concentration of Ni in Sikhote-Alin meteorite was determined. Moreover, Muonionalusta meteorite structure was investigated using the conversion electron Mossbauer spectrometry at room temperature, and α-(Fe, Ni) phase and γ-(Fe, Ni) phase were identified. The obtained results clearly show that the low-power VR-1 research reactor (80 W) is an excellent tool for NAA experiments, and that nuclear-analytical techniques can provide useful data for other scientific branches.

中文翻译：

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VR-1训练反应堆陨石中子活化分析

摘要 使用仪器中子活化分析 (NAA) 结合转换电子穆斯堡尔光谱法对空间物体样品进行了表征。摩尔多瓦陨石、Muonionalusta 陨石和 Sikhote-Alin 陨石的碎片在布拉格捷克技术大学运营的低功率 VR-1 训练反应堆的热中子场中受到辐射。活化的样品通过核伽马光谱技术（半导体HPGe 检测器）进行研究。定性分析表明，陨石中的 Na、Al、Mg、Cl、K、Ti、V、Mn、Fe、Sr 和 Ba 存在，Na、Cl、Mn、Fe、Co、Cu、Ni、As 和 Au 在Muonionalusta 铁陨石，以及 Sikhote-Alin 铁陨石中的 Ni、Co、Fe 和 Mn。使用对比 NAA，陨石中 Na、Al、K、Ti、V、Fe 和 Sr 的浓度，Na、Fe、Ni 的浓度，和 Muonionalusta 陨石中的 Au，以及 Sikhote-Alin 陨石中 Ni 的浓度。此外，在室温下使用转换电子穆斯堡尔光谱法研究了 Muonionalusta 陨石结构，并确定了 α-(Fe, Ni) 相和 γ-(Fe, Ni) 相。获得的结果清楚地表明，低功率 VR-1 研究堆（80 W）是 NAA 实验的绝佳工具，核分析技术可以为其他科学分支提供有用的数据。