用于高温高压下放射性流体样品同步辐射X射线吸收光谱测量的密封装置设计

Design of a containment apparatus for synchrotron XAS measurements of radioactive fluid samples under high temperatures and pressures.

作者信息

Dhakal Diwash, Mayanovic Robert A, Baker Jason L, Boukhalfa Hakim, Xu Hongwu, Sun Cheng-Jun

机构信息

Department of Physics, Astronomy and Materials Science, Missouri State University, Springfield, Missouri 65897, USA.

Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

出版信息

Rev Sci Instrum. 2019 Aug;90(8):083108. doi: 10.1063/1.5100887.

DOI:10.1063/1.5100887

PMID:31472666

Abstract

The simple working principles and versatility of the hydrothermal diamond-anvil cell (HDAC) make it highly useful for synchrotron x-ray studies of aqueous and fluid samples at high pressure-temperature (P-T) conditions. However, safety concerns need to be overcome in order to use the HDAC for synchrotron studies of aqueous radioactive samples at high temperatures and pressures. For accomplishment of such hydrothermal experiments of radioactive materials at synchrotron beamlines, the samples are required to be enclosed in a containment system employing three independent layers of airtight sealing at some synchrotron facilities while enabling access to the sample using several experimental probes, including incoming and outgoing x-rays. In this article, we report the design and implementation of a complete radiological safety enclosure system for an HDAC specialized for high P-T x-ray absorption spectroscopy (XAS) measurements of aqueous solutions containing the actinides at synchrotron beamlines. The enclosure system was successfully tested for XAS experiments using the HDAC with aqueous samples containing depleted uranium at temperatures ranging from 25 to 500 °C and pressures ranging from vapor pressure to 350 MPa.

摘要

水热金刚石压腔（HDAC）简单的工作原理和多功能性使其在高压高温（P-T）条件下对含水和流体样品进行同步加速器X射线研究时非常有用。然而，为了在高温高压下使用HDAC对含放射性水样品进行同步加速器研究，需要克服安全问题。为了在同步加速器光束线上完成此类放射性材料的水热实验，在一些同步加速器设施中，样品需要封装在一个采用三层独立气密密封的包容系统中，同时使用包括入射和出射X射线在内的多个实验探针能够接触到样品。在本文中，我们报告了一种专门为在同步加速器光束线上对含锕系元素的水溶液进行高P-T X射线吸收光谱（XAS）测量而设计的HDAC完整辐射安全封装系统的设计与实现。该封装系统已成功通过使用HDAC进行XAS实验测试，实验使用了含贫铀的含水样品，温度范围为25至500°C，压力范围为蒸气压至350 MPa。