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通过激光光谱学对14个C丰富的环境样本进行AMS验证的高精度放射性碳分析

Tamás Varga¹, Davide Mazzotti², Mihály Molnár³

¹International Radiocarbon AMS Competence and Training (INTERACT) Center, HUN REN Institute for Nuclear Research, Bem Square 18/c, H 4026, Debrecen, Hungary; Isotoptech Ltd., Bem Square 18 /c, H 4026, Debrecen, Hungary.

|December 2, 2025

概括

一种新的基于激光的和吸收CAvity Ring-down (SCAR) 技术提供了一种快速,具有成本效益的方法来测量环境样本中的放射性碳 (C). 这种技术的准确性与加速器质谱学 (AMS) 相当,为核环境保护提供了有价值的替代方案.

科学领域:

环境科学环境科学
核化学核化学核化学
分析化学分析化学

背景情况:

放射性碳 (C) 对于核环境保护至关重要,因为它从核工业中获得了大量的剂量贡献.
在受14C排放影响的地区,精确测量14C是必不可少的.
目前的方法,如加速器质谱 (AMS) 和液体闪计数 (LSC) 是有效的,但可能是耗时或昂贵的.

研究的目的:

评估和吸收CAvity Ring-down (SCAR) 光谱作为C分析的新方法的潜力.
将SCAR的性能与已建立的技术 (AMS,IRMS) 进行比较,以测量缩样本中的14C.
为了证明SCAR的适用性,用于分析C含量略高的环境和植物样本.

主要方法:

用C丰富的植物样本燃烧以产生CO2气体.
使用AMS,SCAR和同位素比重质谱法 (IRMS) 测量C和C同位素比率.
通过SCAR和AMS获得的结果的比较分析,包括Δ13C校正.

主要成果:

在 δ ¹³ C 校正后,SCAR 技术复制了 AMS 测量结果,差异小于 4%.
该SCAR方法证明了足够的准确性和线性,用于测量115至2600 pMC的植物样本中的C比.
这项研究是第一个使用AMS,SCAR和IRMS进行比较同位素分析来测量来自同一来源的CO2气体子样本.

结论:

在C分析中,SCAR为AMS和LSC提供了一种快速,可靠和具有成本效益的替代方案,特别是对于轻微标记或轻微丰富的样品.
SCAR适用于涉及有机样本的核环境保护应用,其C值超过自然环境度 (≤100 pMC).
这些发现支持SCAR作为放射性碳研究和环境监测的有希望的新工具.

关键词:

(14) 富含C的物质加速器质谱学质谱学植物植物植物放射性碳的使用方法和吸收腔的环形下降.

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