Krypton and Xenon from the Solar Wind and Solar Energetic Particles in Two Lunar Ilmenites of Different Antiquity
Krypton and Xenon from the Solar Wind and Solar Energetic Particles in Two Lunar Ilmenites of Different Antiquity
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两颗不同年代的月球钛铁矿中的太阳风和太阳高能粒子中的氪和氙
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
H. Baur
中科院分区：
文献类型：
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作者：
R. Wieler;H. Baur
我们给出了两个月球样品在不同时期受到太阳粒子辐射的闭合系统阶梯蚀刻钛铁矿所获得的Kr和Xe同位素数据。据报道，同一样品中的氦、Ne和Ar由两个组分组成：第一步释放的同位素未分馏太阳风(Sw)，以及后来释放的较重的同位素组分(SEP)，因此位于更深的位置。现在观察到重惰性气体也有同样的释放特征。我们还得出结论，太阳Kr和Xe由两个同位素不同的成分组成，注入了不同的能量。最近辐照的土壤中的Sw-Kr的成分非常接近大气中的Kr，这与其他新报道的阶梯状蚀刻和燃烧运行数据相一致。未发现随时间变化的Sw-Kr或Sw-Xe谱的明显证据。“表面相关”Kr和Xe组分“SUCOR”和“BEOC 12001”是Sw和SEP的混合物。与Sw和SEP相关的同位素分馏系数接近五种稀有气体质量比的平方。我们推断，钛铁矿中测量的Kr/Xe比值与太阳粒子辐射中的这一比值基本相同。
We present Kr and Xe isotope data obtained by closed system stepped etching of ilmenite separates from two lunar samples exposed to the solar corpuscular radiation at different epochs. Helium, neon, and argon in the same samples were reported to consist of two components: isotopically unfractionated solar wind (SW) released in the first steps, and an isotopically heavier component (SEP) released later and, thus, sited at larger depth. The same release characteristic is now observed for the heavy noble gases. We also conclude that solar Kr and Xe consist of two isotopically different components, implanted with different energies. The SW-Kr in a recently irradiated soil has a composition very close to atmospheric Kr, which agrees with other newly reported data from stepped etch- and combustion runs. No clear evidence for temporally variable SW-Kr or SW-Xe spectra was found. “Surface correlated” Kr and Xe components “SUCOR” and “BEOC 12001” are a mixture of SW and SEP. The isotopic fractionation factors relating SW and SEP are close to the square of the mass ratios for all five noble gases. We infer that the measured Kr/Xe ratio in ilmenite is essentially identical to this ratio in the solar corpuscular radiation.