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How well do we understand production of Cl-36 in limestone and dolomite?

机译:我们如何理解石灰石和白云岩中Cl-36的生成?

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We have evaluated all parameters for the calculation of cosmogenic Cl-36 production rates and thus surface exposure ages in dolomite and limestone. We found that we can use either of both published negative muon stopping rates until more information is available. The largest uncertainty of the age estimation in the upper meter of rock comes from the Cl-36 production rate from Ca spallation and, in the case of 50-100 ppm Cl content, from the production rate of epithermal neutrons, which we estimate at 760 +/- 150 neutrons/g_air/yr (1 sigma). For a sample with representative amounts of Ca and Cl (20 wt% Ca and 50 ppm Cl, or 40 wt% Ca and 100 ppm Cl), the age can be calculated with a precision of 7-10% in the top 1.5 m of the depth profile. Further improvement of Cl-36 calculations depends on new calibration of Cl-36 production from Ca spallation, re-evaluation of Cl-36 production by low-energy neutron capture on Cl-35, as well as of the muon flux and muon capture based on the most recent measurement data.
机译:我们已经评估了所有参数,用于计算宇宙成因Cl-36的生产率,从而计算了白云岩和石灰岩的表面暴露年龄。我们发现我们可以使用两个已发布的负μon停止率之一,直到获得更多信息为止。岩石上部米龄估计的最大不确定性来自钙散裂的Cl-36生产率,以及在50-100 ppm Cl含量的情况下,超热中子的生产率,我们估计为760 +/- 150个中子/ g_air / yr(1 sigma)。对于具有代表性的Ca和Cl含量(20 wt%Ca和50 ppm Cl,或40 wt%Ca和100 ppm Cl)的样品,可以计算出在顶部1.5 m内的年龄为7-10%的精度。深度剖面。 Cl-36计算的进一步改进取决于对Ca剥落产生的Cl-36产生的新标定,通过对Cl-35进行低能中子俘获来重新评估Cl-36产生以及基于μ子通量和μ子俘获根据最新的测量数据。

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