射线对CR-39探测器对2.4-MeV质子的灵敏度的影响
R Kishimori1, M Cufari1, E Z L Zhong-Johnson2
1Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA.
The Review of scientific instruments
|July 18, 2025
概括
暴露于X射线显著降低了CR-39核轨道探测器的灵敏度,影响了核聚变实验中的轨道尺寸和测量精度. 这种敏感性损失归因于X射线诱导的交叉链接,影响材料的溶解性.
科学领域:
- 核物理与工程 核物理与工程
- 材料科学 材料科学 材料科学
背景情况:
- 像CR-39这样的固态核轨道探测器对于核聚变实验中的带电粒子检测至关重要.
- 这些探测器在暴露于1 Gy左右的X射线剂量时表现出降低的灵敏度,影响了轨道特征.
研究的目的:
- 用原子力显微镜量化X射线辐射对CR-39探测器灵敏度的影响.
- 研究吸收的X射线剂量与CR-39轨道参数 (直径,深度,灵敏度比) 之间的关系.
主要方法:
- 使用原子力显微镜 (AFM) 在质子辐射后测量CR-39轨道尺寸 (直径和深度).
- 计算了辐射和非辐射CR-39样本的灵敏度参数 (Vt/Vb,轨道与散装蚀刻速率的比率).
- 将CR-39样品暴露在不同剂量的X射线中,以模拟实验条件.
主要成果:
- 吸收的X射线剂量约为1 Gy,使CR-39轨道直径减少了3倍 (从~1200 nm到~400 nm).
- 轨道深度在1 Gy的X射线剂量下降了一个数量级 (从~550nm到~50nm).
- CR-39的灵敏度参数 (Vt/Vb) 从约1.1大幅下降到1.01以下,剂量>0.5 Gy使轨道直径降低到光学显微镜极限以下.
结论:
- 在CR-39材料中X射线诱导的交叉链接是敏感性丧失的主要机制.
- 沿着粒子轨迹交联的CR-39的可溶性降低,妨碍了轨迹的准确检测和测量.
- 这些发现与解释来自OMEGA和NIF实验的CR-39数据有关,考虑到典型的X射线剂量 (0.01-1 Gy).
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