Accurate measurement of 55Fe by liquid scintillation counting with phosphoric acid in low- to intermediate-level radioactive waste

IF 1.6 3区化学 Q3 CHEMISTRY, ANALYTICAL

Journal of Radioanalytical and Nuclear Chemistry Pub Date : 2025-09-06 DOI:10.1007/s10967-025-10342-5

Jung Bo Yoo, Kyunghun Jung, Yu Jin Lee, Simon Oh, Hyeonjune Noh, Jai Il Park

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Abstract

This study aimed to enhance the precision of measuring the concentration of the ⁵⁵Fe nuclide in radioactive waste. In contrast to the Low-Energy Germanium Detector (LEGe), which requires a complex sample preparation process, Liquid Scintillation Counting (LSC) offers the advantage of straightforward sample preparation by dissolving Fe precipitates in acids and subsequently mixing them with a scintillation cocktail. We conducted an analysis to determine the correlation between colour quenching parameters and measurement efficiency, particularly in relation to the Fe content within the sample. Through the optimization of measurement conditions for solutions containing up to 100 mg of Fe with phosphoric acid, we achieved a detection limit up to approximately 100-fold improvement in the Minimum Detectable Activity (MDA) by LSC when compared to LEGe. This optimization significantly contributed to enhancing the accuracy of ⁵⁵Fe measurements.

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用磷酸液体闪烁计数法精确测定中低水平放射性废物中的55Fe

本研究旨在提高放射性废物中55Fe核素浓度的测量精度。与需要复杂样品制备过程的低能锗探测器（LEGe）相比，液体闪烁计数（LSC）提供了通过将铁沉淀溶解在酸中并随后将其与闪烁鸡尾酒混合来直接制备样品的优势。我们进行了分析，以确定颜色淬火参数和测量效率之间的相关性，特别是与样品中的铁含量有关。通过优化含有高达100 mg铁的磷酸溶液的测量条件，与LEGe相比，LSC的最低可检测活性（MDA）的检测限提高了约100倍。这种优化大大提高了55Fe测量的精度。

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来源期刊

Journal of Radioanalytical and Nuclear Chemistry 化学-分析化学

CiteScore

2.80

自引率

18.80%

发文量

504

审稿时长

2.2 months

期刊介绍： An international periodical publishing original papers, letters, review papers and short communications on nuclear chemistry. The subjects covered include: Nuclear chemistry, Radiochemistry, Radiation chemistry, Radiobiological chemistry, Environmental radiochemistry, Production and control of radioisotopes and labelled compounds, Nuclear power plant chemistry, Nuclear fuel chemistry, Radioanalytical chemistry, Radiation detection and measurement, Nuclear instrumentation and automation, etc.