Distribution of Radionuclide Impurities in Irradiated Topaz

IF 0.4 Q4 PHYSICS, PARTICLES & FIELDS

Physics of Particles and Nuclei Letters Pub Date : 2025-05-14 DOI:10.1134/S1547477124702388

M. Bulavin, T. Enik, E. Kuznetsova, A. Rogachev, S. Tutunnikov, K. Vergel, B. Yuldashev, I. Zinicovscaia, I. Ulanova

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Abstract

Irradiation is one of the most efficient techniques to enhance gemstones, and color enhanced topaz is the best example of commercial application of neutron irradiation. After irradiation the color of topaz turns into deep blue resulting in so-called London blue topaz. However, neutron irradiation induces radionuclides of different half-life time and thus causes radioactivity of the gemstones. For color enhanced topaz it may take up to several months or even years for residual radioactivity to reach a safe level. The residual activity may significantly vary among topaz samples even if they have originally been obtained from the same deposit. We present results of spectroscopic analysis of about 350 irradiated topaz samples. Large variation in residual activity measured in several months after the irradiation is observed. Different types and different concentration of radionuclides are identified. To optimize the color enhancement procedure and to reduce the storage time required to reach the safe level of residual activity, a pre-irradiation procedure is proposed.

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辐照黄玉中放射性核素杂质的分布

辐照是增强宝石最有效的技术之一，增强黄玉是中子辐照商业应用的最佳例子。经过辐照后，黄玉的颜色变成深蓝色，形成所谓的伦敦蓝黄玉。然而，中子辐照会诱发不同半衰期的放射性核素，从而使宝石具有放射性。对于颜色增强的黄玉，其残余放射性可能需要数月甚至数年才能达到安全水平。残留活性可能在黄玉样品之间显著不同，即使它们最初是从同一矿床获得的。本文报道了350个辐照黄玉样品的光谱分析结果。观察到辐照后几个月测量的残余活性有很大变化。鉴定出不同类型和不同浓度的放射性核素。为了优化颜色增强程序并减少达到安全残留活性水平所需的储存时间，提出了一种预辐照程序。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physics of Particles and Nuclei Letters PHYSICS, PARTICLES & FIELDS-

CiteScore

0.80

自引率

20.00%

发文量

108

期刊介绍： The journal Physics of Particles and Nuclei Letters, brief name Particles and Nuclei Letters, publishes the articles with results of the original theoretical, experimental, scientific-technical, methodological and applied research. Subject matter of articles covers: theoretical physics, elementary particle physics, relativistic nuclear physics, nuclear physics and related problems in other branches of physics, neutron physics, condensed matter physics, physics and engineering at low temperatures, physics and engineering of accelerators, physical experimental instruments and methods, physical computation experiments, applied research in these branches of physics and radiology, ecology and nuclear medicine.