Radiological Zoning and Clearance Methodology of activated cables in the LHC accelerator at CERN

IF 1.8 3区工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR Applied Radiation and Isotopes Pub Date : 2025-04-01 Epub Date: 2025-01-25 DOI:10.1016/j.apradiso.2025.111692

Patrycja Dyrcz, Angelo Infantino, Nabil Menaa, Safouane El-Idrissi, Heinz Vincke

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Abstract

In the context of upgrading the Large Hadron Collider (LHC) to its High-Luminosity (HL-LHC) configuration, it is essential to conduct a thorough zoning classification and characterization of activated cables within the particle accelerator. To address this need, a methodology was developed to identify regions where materials can be cleared from regulatory control in compliance with the Swiss Radiation Protection Legislation.

The study begins with optimizing the elemental composition of cables and validating Monte Carlo FLUKA simulations using high-energy resolution gamma spectrometry (GS) and total gamma counting (TGC) measurements on 19 copper cable samples, collected during the winter shutdown 2023/2024.

This methodology enables performing radiological zoning and accurately defines the radiological classification of the cables installed in the LHC Points 1 and 5, including both the accelerator tunnel and service galleries, prior to dismantling.

Finally, the study proposes a conservative scaling factor for cable zoning and introduces a TGC figure of merit (FOM), representing a conservative activation scenario for the copper cable types.

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欧洲核子研究中心大型强子对撞机加速器激活电缆的辐射区划和清除方法。

在将大型强子对撞机（LHC）升级到高亮度（HL-LHC）配置的背景下，有必要对粒子加速器内的激活电缆进行彻底的分区分类和表征。为了满足这一需求，制定了一种方法，以确定可以根据瑞士辐射保护立法清除材料的区域。该研究首先优化电缆的元素组成，并利用高能分辨率伽马能谱（GS）和总伽马计数（TGC）测量对2023/2024年冬季停工期间收集的19个铜电缆样品进行蒙特卡罗FLUKA模拟验证。该方法可以进行放射性分区，并准确定义安装在LHC 1和5点（包括加速器隧道和服务通道）的电缆在拆除之前的放射性分类。最后，该研究提出了电缆分区的保守比例因子，并引入了TGC价值图（FOM），代表了铜电缆类型的保守激活情况。

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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.