首页> 外文期刊>Journal of Nuclear Physics, Material Sciences, Radiation and Applications >Dose Calibration and Track Diameter Distribution for 241Am-Be Neutron Source, Using CR-39 Nuclear Track Methodology
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Dose Calibration and Track Diameter Distribution for 241Am-Be Neutron Source, Using CR-39 Nuclear Track Methodology

机译:使用CR-39核径迹方法的 241 Am-Be中子源的剂量校准和径径分布

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In neutron detection, the more common method is using electronic instrumentation associate with Bonner spheres, however, currently the Nuclear Tracks Methodology (NTM) is coming popular because of the simplicity, flexibility in size of the detector, no requirement for sophisticated instrumentation and installation, and low cost. In this work, a preliminary result of the dose calibration and track diameter distribution of Americium-Beryllium (~(241)Am-Be) source using Nuclear Track Methodology is presented. As material detector, CR-39 polycarbonate, cut in 1.8 × 0.9 cm2 chips was chosen, and two step chemical etchings after neutron exposure was used to develop the tracks. The irradiations were made in environmental normal conditions, in the ORNL neutron calibration facilities. The CR-39 chips were placed in a phantom, with 3mm plastic (Lexan) sheet in between the source and detectors to increase the proton generation. The total track density and track diameter distribution was performing in a Counting and Analysis Digital Image System (CADIS), developed at the Institute of Physics of the University of Mexico UNAM. The results are compared with a standard survey instrument and energy reference spectra of the International Atomic Energy Agency (IAEA).
机译:在中子检测中,更常见的方法是使用与Bonner球体关联的电子仪器,但是,由于检测器的简单性,灵活性,对精密仪器和安装的要求,目前,核轨道方法(NTM)变得流行起来,且价格低廉。在这项工作中,提出了使用核径迹法对A-铍(〜(241)Am-Be)源进行剂量校准和径迹直径分布的初步结果。作为材料检测器,选择了切成1.8×0.9 cm2芯片的CR-39聚碳酸酯,并使用了中子暴露后的两步化学蚀刻来形成轨迹。辐射是在ORNL中子校准设备中的正常环境条件下进行的。将CR-39芯片置于幻像中,在源和探测器之间放置3mm的塑料(Lexan)薄片,以增加质子的产生。总磁道密度和磁道直径分布是在墨西哥国立大学墨西哥大学物理研究所开发的计数和分析数字图像系统(CADIS)中进行的。将结果与国际原子能机构(IAEA)的标准测量仪器和能量参考光谱进行比较。

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