商业硅藻土在回顾性剂量测定和年代测定中的初始热释光/光释光/电子顺磁共振考虑因素。

INITIAL TL/OSL/EPR CONSIDERATIONS FOR COMMERCIAL DIATOMACEOUS EARTH IN RETROSPECTIVE DOSIMETRY AND DATING.

作者信息

Hayes Robert B, O'Mara Ryan P, Hooper David A

机构信息

North Carolina State University, Nuclear Engineering Department, 2500 Stinson Dr., Raleigh, NC, USA.

Oak Ridge National Laboratory, Nuclear Security Modeling Group, 1 Bethel Valley Road, Oak Ridge, TN, USA.

出版信息

Radiat Prot Dosimetry. 2019 Dec 31;185(3):310-319. doi: 10.1093/rpd/ncz013.

DOI:10.1093/rpd/ncz013

PMID:30806457

Abstract

Diatomaceous earth is found in various locations around the planet. It is caused by the deposited exoskeleton material formed by the death of large concentrated populations of diatoms. The exoskeleton is effectively pure silicate and as such becomes a prospective material for retrospective dosimetry and dating. This work investigated the thermoluminescence (TL) and optically stimulated luminescence properties of commercially obtained diatomaceous earth. The material was not found to have useful dosimetric properties with conventional TL methodologies but did provide large dose estimates using the Single Aliquot Regeneration technique on some subset samples. These findings for organic silicate did suggest some mechanisms explaining the sensitization process in geological silicate materials utilized in dosimetry and dating. Electron paramagnetic resonance was identified as a potential future method for evaluating this material as it revealed unique signal components not found in igneous or commercially produced silicates.

摘要

硅藻土在地球上的各个地方都有发现。它是由大量硅藻集中死亡后沉积的外骨骼物质形成的。外骨骼实际上是纯硅酸盐，因此成为回顾性剂量测定和年代测定的潜在材料。这项工作研究了商业获得的硅藻土的热释光（TL）和光激发发光特性。使用传统的热释光方法未发现该材料具有有用的剂量测定特性，但在一些子集样本上使用单份等分试样再生技术确实提供了大剂量估计。这些关于有机硅酸盐的发现确实提出了一些机制，解释了在剂量测定和年代测定中使用的地质硅酸盐材料中的敏化过程。电子顺磁共振被确定为未来评估该材料的一种潜在方法，因为它揭示了在火成岩或商业生产的硅酸盐中未发现的独特信号成分。