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首页> 外文期刊>Quaternary geochronology >2D modelling: A Monte Carlo approach for assessing heterogeneous beta dose rates in luminescence and ESR dating: Paper II, application to igneous rocks
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2D modelling: A Monte Carlo approach for assessing heterogeneous beta dose rates in luminescence and ESR dating: Paper II, application to igneous rocks

机译：2D造型：蒙特卡罗评估升温和ESR约会中的异质β剂量率：纸张II，应用于火岩

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摘要

Accurate evaluations of beta dose rates are crucial in luminescence and electron spin resonance (ESR) thermochronology. Most igneous rocks are heterogeneous and have complex mineralogical structures that render them unsuitable for the conventional methods of beta dose rate calculations based on infinite matrix assumptions. The recently developed software DosiVox-2D provides a Monte-Carlo approach for calculating beta dose rates in realistic heterogeneous geometries. In this paper, we present 2D simulations of uniform and layered igneous rocks. For the modelling, mineral distribution maps were obtained by QEM-EDS (quantitative evaluation of minerals using energy dispersive spectroscopy) and radionuclide concentrations in minerals were determined by laser ablation (LA) ICP-MS. The results show that the skewness of beta dose rate distributions in quartz reduces as the K concentration in a rock increases, and the estimation of the beta dose rate can be critically influenced by the U and Th concentrations and distributions.
机译：β剂量率的准确评估在发光和电子自旋共振（ESR）热量中是至关重要的。大多数成因岩石是异质的，并且具有复杂的矿物学结构，使它们不适于基于无限基质假设的β剂量率计算的常规方法。最近开发的软件Dosivox-2d提供了一种用于计算现实异构几何形状的β剂量率的Monte-Carlo方法。在本文中，我们展示了2D模拟的均匀和分层的岩石。对于造型，通过QEM-EDS获得矿物分布图（使用能量分散光谱的矿物的定量评估），通过激光烧蚀（LA）ICP-MS测定矿物质中的放射性核素浓度。结果表明，当岩石中的k浓度增加时，石英中β剂量分布的偏差减少，并且β剂量率的估计可以受到U和Th浓度和分布的统治性影响。

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