Hybrid Gama Emission Tomography (HGET): FY16 Annual Report

Optimization of Yonsei Single-Photon Emission Computed Tomography (YSECT) Detector for Fast Inspection of Spent Nuclear Fuel in Water Storage

“…GET offers intuitive tomographic imaging of SNF assemblies and discrimination of rod-by-rod radioactivity by rotatable-detector scanning. Passive gamma emission tomography (PGET), the first representative GET equipment that consists of CdZnTe detectors and a tungsten collimator, was authenticated by the IAEA in 2017 for partial-defect interrogation of SNF assemblies [4][5][6]. However, PGET has a drawback in the form of low detection efficiency due to the use of a small-sized semiconductor, which may incur inspection time delay, especially for densely arranged SNF assemblies maintained in water storage [6].…”

“…Passive gamma emission tomography (PGET), the first representative GET equipment that consists of CdZnTe detectors and a tungsten collimator, was authenticated by the IAEA in 2017 for partial-defect interrogation of SNF assemblies [4][5][6]. However, PGET has a drawback in the form of low detection efficiency due to the use of a small-sized semiconductor, which may incur inspection time delay, especially for densely arranged SNF assemblies maintained in water storage [6]. Therefore, the IAEA has attempted to develop different types of GET equipment with which SNF assembly inspection can be completed within 1-2 hours for all SNF assembly types [5,6].…”

Optimization of single-photon emission computed tomography system for fast verification of spent fuel assembly: a Monte Carlo study

“…The detector module consists of cylindrical LaBr 3 scintillators with 38 mm in diameter and height, photomultiplier tubes, and 200×1.5×10 mm 3 collimators [5]. In 2017, hybrid gamma emission tomography (HGET) system was developed by changing a type of detector of the PGET system [6]. The detector module is composed of 30×3×70 mm 3 BGO scintillators and 50×1.5×70 mm 3 collimators [6].…”

“…In 2017, hybrid gamma emission tomography (HGET) system was developed by changing a type of detector of the PGET system [6]. The detector module is composed of 30×3×70 mm 3 BGO scintillators and 50×1.5×70 mm 3 collimators [6]. Although various SPECT systems were developed for many years, there are still limitations in verification of fuel assemblies within a short measurement time.…”

“…Although various SPECT systems were developed for many years, there are still limitations in verification of fuel assemblies within a short measurement time. As following Pacific Northwest National Laboratory (PNNL) report in 2017 [6], the total verification time of unirradiated fuel assemblies using the HGET system should be on the order of 1-2 hours; however, it could be up to 10 hours for some fuel types. Therefore, the aim of this study is to optimize detector geometry of SPECT system using Monte Carlo method for faster verification of spent fuel assemblies than the conventional system.…”