Preparation of radon-free thoron sources based on 228Th separated from industrial thorium nitrate

IF 1.8 3区工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR

Applied Radiation and Isotopes Pub Date : 2026-06-01 Epub Date: 2026-03-10 DOI:10.1016/j.apradiso.2026.112557

Chunyu He , Lingzhi Cui , Kang Peng , Jinmin Yang , Lei Zhang , Qiuju Guo

引用次数: 0

Abstract

To improve the metrological traceability of thoron activity concentration, we separated ²²⁸Th from industrial thorium nitrate and produced flow-through radon-free thoron sources using two different methods. Four flow-through sources with different activities ranging from 120 Bq to 1200 Bq were prepared, and the activity, thoron emanation coefficient and stability were evaluated. Results show that loading the ²²⁸Th solution onto a TEVA resin column gave significantly higher ²²⁸Th recovery rates and better stability than immersing TEVA resin directly into the solution. The thoron emanation coefficient increases as absolute humidity increases, which can be used to realize different thoron concentration environments. The average emanation coefficient for the four different thoron sources was 96.37% ± 2.38% at absolute humidity above 20 g/m³.

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以工业硝酸钍分离的228Th为原料制备无氡钍源

为了提高钍活度浓度的计量溯源性，我们从工业硝酸钍中分离出228Th，并采用两种不同的方法制备了无氡流通式钍源。制备了4种活度为120 ~ 1200 Bq的流动源，并对其活度、辐射系数和稳定性进行了评价。结果表明，与直接浸泡TEVA树脂相比，在TEVA树脂柱上加载228Th溶液可获得更高的228Th回收率和更好的稳定性。辐射系数随绝对湿度的增大而增大，可用于实现不同的辐射浓度环境。在绝对湿度大于20 g/m3时，4种不同刺源的平均辐射系数为96.37% ± 2.38%。

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

Applied Radiation and Isotopes 工程技术-核科学技术

CiteScore

3.00

自引率

12.50%

发文量

406

审稿时长

13.5 months

期刊介绍： Applied Radiation and Isotopes provides a high quality medium for the publication of substantial, original and scientific and technological papers on the development and peaceful application of nuclear, radiation and radionuclide techniques in chemistry, physics, biochemistry, biology, medicine, security, engineering and in the earth, planetary and environmental sciences, all including dosimetry. Nuclear techniques are defined in the broadest sense and both experimental and theoretical papers are welcome. They include the development and use of α- and β-particles, X-rays and γ-rays, neutrons and other nuclear particles and radiations from all sources, including radionuclides, synchrotron sources, cyclotrons and reactors and from the natural environment. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. Papers dealing with radiation processing, i.e., where radiation is used to bring about a biological, chemical or physical change in a material, should be directed to our sister journal Radiation Physics and Chemistry.