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Production rates of cosmogenic nuclides in boulders

机译:巨石中宇宙性核素的生产率

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摘要

We study how the production rates of cosmogenic nuclides in solid targets at the Earth's surface depend on the shape and size of a sampled rock and the position of a sample. We use a physical model simulating the interaction of galactic cosmic ray particles with matter. Production rates at boulder surfaces may be up to 10-12% lower than values at the surface of an infinite flat target of the same chemical composition, even when the former sample sees cosmic rays from the full 2π solid angle. This is because cosmic ray neutrons are more easily lost back to the atmosphere from within a non-flat sample than from a flat surface. Therefore, the shape and size of a boulder need to be considered when taking samples, and production rates may have to be corrected accordingly.
机译:我们研究了地球表面固体目标中的宇宙成因核素的生产率如何取决于采样岩石的形状和大小以及采样位置。我们使用物理模型模拟银河系宇宙射线粒子与物质的相互作用。即使在前一个样品从完整的2π立体角看到宇宙射线的情况下,巨石表面的生产率也可能比相同化学成分的无限平坦靶材表面的生产率低10-12%。这是因为宇宙射线中子比非平面样品更容易从非平面样本中流回大气。因此,在取样时需要考虑巨石的形状和大小,并且可能必须相应地修正生产率。

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