γ射线场中环氧/多壁碳纳米管纳米复合材料的剂量学特性：厚度的影响

Dosimetry characteristics of Epoxy/MWCNT nanocomposite in the field of gamma-rays: Effect of thickness.

作者信息

Alipour Mehdi, Jafari Hamid, Malekie Shahryar, Mosayebi Armin

机构信息

Department of Radiation Application, Shahid Beheshti University, Tehran, Iran.

Radiation Application Research School, Nuclear Science and Technology Research Institute, P.O. Box 31485-498, Karaj, Iran.

出版信息

Appl Radiat Isot. 2023 Oct;200:110982. doi: 10.1016/j.apradiso.2023.110982. Epub 2023 Aug 15.

DOI:10.1016/j.apradiso.2023.110982

PMID:37597269

Abstract

Polymer-carbon nanostructures have been used as gamma-ray dosimeters. The thickness of the sensitive volume material plays an important role in the determination of the dosimetry response. In this work, the thickness effect of a real-time dosimeter based on the Epoxy/Multi-walled carbon nanotube (MWCNT) nanocomposite was investigated. The amount of electrical percolation threshold (EPT) for Epoxy/MWCNT nanocomposite was initially simulated using the finite element method. Then, the 0.1 MWCNT wt% nanocomposite was fabricated using a solution method with three thicknesses of 1, 2, and 3 mm. FESEM images demonstrated a good dispersion state of the inclusions into the Epoxy matrix. The samples were irradiated by gamma-rays of Co-60 source over the dose rates of 25-166 mGy/min. In addition, dosimetric characteristics were performed, including linearity, bias-polarity, angular dependence, energy dependence, field size, and repeatability. Results revealed that with increasing the thickness, the dosimetry response was enhanced remarkably.

摘要

聚合物-碳纳米结构已被用作伽马射线剂量计。灵敏体积材料的厚度在剂量学响应的测定中起着重要作用。在这项工作中，研究了基于环氧树脂/多壁碳纳米管（MWCNT）纳米复合材料的实时剂量计的厚度效应。首先使用有限元方法模拟了环氧树脂/MWCNT纳米复合材料的电渗流阈值（EPT）量。然后，采用溶液法制备了0.1 MWCNT重量百分比的纳米复合材料，其厚度分别为1、2和3毫米。场发射扫描电子显微镜（FESEM）图像表明夹杂物在环氧树脂基体中具有良好的分散状态。样品用钴-60源的伽马射线以25-166毫戈瑞/分钟的剂量率进行辐照。此外，还进行了剂量学特性测试，包括线性、偏置极性、角度依赖性、能量依赖性、场大小和重复性。结果表明，随着厚度的增加，剂量学响应显著增强。