In this work, a nondestructive gamma scanning technique has been applied to determine the irradiated fuel burnup of Tehran Research Reactor (TRR). Thereby, a system was designed and installed at the rim of the TRR pool, which includes a High-Purity Germanium (HPGe) detector and associated electronics-devices, a proper shield, a collimator, and an elevator to radioactive fuel handling for any longitudinal and transverse fuel movement. In the system, it also was possible to measure fuel burnup for fuels with short cooling times at the minimum distance between the fuel and the detector. Five Standard Fuel Elements (SFEs) have been studied with U3O8Al fuel in burnup range of 14%–60% FIMA and cooling time range of 60 days–550 days. Then, by analyzing the gamma-ray emitted from 137Cs isotope as a fuel burnup indicator, an axial profile of fuel burnup was measured in the active fuel length of 61.5 cm and an active width of 6 cm. Finally, verification of results from reactor physics calculations was conducted based on fuel burnup measurements using a nondestructive gamma scanning technique that represents a well enough agreement between calculations and measurements.

在这项工作中，已应用非破坏性伽马扫描技术确定德黑兰研究堆（TRR）的辐照燃料燃耗。因此，在TRR池的边缘设计并安装了一个系统，该系统包括高纯锗（HPGe）检测器和相关的电子设备，适当的防护罩，准直仪和用于处理任何纵向放射性燃料的升降机。和燃料横向移动。在该系统中，还可以在燃料与检测器之间的最小距离下，以较短的冷却时间来测量燃料的燃耗。使用U3O8Al燃料对五种标准燃料元素（SFE）进行了研究，燃耗范围为14％–60％FIMA，冷却时间范围为60天至550天。然后，通过分析从137Cs同位素发出的伽马射线作为燃耗指标，在有效燃料长度为61.5 cm，有效宽度为6 cm的情况下，测量了燃耗的轴向轮廓。最后，使用无损伽玛扫描技术基于燃料燃耗测量结果对反应堆物理计算结果进行了验证，该技术代表了计算和测量结果之间的充分吻合。