ABSTRACT

Neutron radiography is an important nondestructive tool for analyzing both light and heavy elements. Most of the neutron radiography systems utilize research reactors as the source of neutrons. A feasibility study is presented in this work for designing a low-cost and efficient radiography system using a Deuteron-Deuteron neutron generator. The simulation software MCNP5 was utilized in this study to obtain an optimal moderator thickness to thermalize the fast neutrons and a shielding design needed to minimize the neutrons and gamma rays in the camera. A study was also made to test the sensitivity of the imaging system to different crack sizes in the sample and the sample activation due to neutron irradiation.

摘要

中子射线照相术是分析轻元素和重元素的重要无损工具。大多数中子射线照相系统利用研究堆作为中子源。在这项工作中提出了可行性研究，目的是设计一种使用Deuteron-Deuteron中子发生器的低成本高效放射线照相系统。在这项研究中，使用了模拟软件MCNP5来获得最佳的减速器厚度，以使快中子热化，并采用了一种屏蔽设计，以最小化相机中的中子和伽马射线。还进行了一项研究，以测试成像系统对样品中不同裂纹尺寸的敏感性以及由于中子辐照而引起的样品活化。