Abstract This work presents the analysis of the images acquired by 3D scans of Fluorescence Nuclear Track Detector (FNTD)-based neutron dosimeters irradiated with fast neutrons. The objective is to demonstrate the feasibility of 3D track-spot detection and trajectories reconstruction of recoil protons, offering a robust δ-ray filtering, and investigate if this analysis provides useful information on the exposure conditions, compared to the currently implemented single-layer analysis. The FNTD crystal volume was scanned with a confocal laser scanning microscope to obtain stacked images. The images were processed to detect the foreground track-spots, which were linked using a particle tracking software. We performed a statistical analysis of the recoil-protons reconstructed trajectories. The analyzed data show that it is possible to distinguish neutron spectra having different energies by analyzing the ranges of the detected particles. Moreover, we demonstrate that the incidence of radiation angle can be determined in directional fields. For a reliable detector evaluation, however, better statistics obtained by scanning larger area of the FNTD crystal is needed.

中文翻译：

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荧光核径迹探测器 (FNTD) 中中子诱导反冲质子的 3D 径迹重建

摘要 这项工作介绍了对快中子辐照的基于荧光核径迹探测器 (FNTD) 的中子剂量计的 3D 扫描获得的图像进行分析。目的是证明 3D 轨迹点检测和反冲质子轨迹重建的可行性，提供强大的 δ 射线过滤，并研究与当前实施的单层分析相比，该分析是否提供了有关曝光条件的有用信息. 用共焦激光扫描显微镜扫描 FNTD 晶体体积以获得堆叠图像。对图像进行处理以检测前景轨迹点，这些轨迹点使用粒子跟踪软件进行链接。我们对反冲质子重建轨迹进行了统计分析。分析数据表明，通过分析检测到的粒子的范围，可以区分具有不同能量的中子谱。此外，我们证明了辐射角的入射可以在定向场中确定。然而，对于可靠的探测器评估，需要通过扫描更大面积的 FNTD 晶体获得更好的统计数据。