Geometrical optimisation of a segmented HPGe detector for spectroscopic gamma emission tomography—A simulation study

Rathore, Vikram; Senis, Lorenzo; Sundén, E. Andersson; Jansson, Peter; Håkansson, Ane; Andersson, Peter

doi:10.1016/j.nima.2021.165164

Cited by 6 publications

(4 citation statements)

References 11 publications

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“…The article presents the methods for predicting the gammaray spectrum, and the predictions are benchmarked using a spectrum obtained in Halden from fuel that is representative of the planned use, a high-burnup, short-cooling time transient test rod. The proposed method will be used in particular for the optimization of a planned tomography system for high spatialresolution GET [15,16]. However, methods for spectrum prediction may be useful also in general, in the planning of gamma scanning and GET campaigns at research reactors, commercial reactors, or hot cell facilities.…”

Section: Introductionmentioning

confidence: 99%

A Computational Methodology for Estimating the Detected Energy Spectra of the Gamma-Ray Flux From Irradiated Nuclear Fuel

Senis

Elter

Rathore

et al. 2022

IEEE Trans. Nucl. Sci.

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Gamma-ray spectrometry using collimated detectors is a well-established examination method for irradiated nuclear fuel. However, the feasibility of examining a particular nuclide of interest is subject to constraints; the peak must be statistically determinable with the desired precision and the total spectrum count rate in the detector should not cause throughput issues.Methods were assembled for gamma spectrum prediction to optimize instruments for gamma emission tomography and to enable a priori feasibility evaluation of determination of single peaks of irradiated nuclear fuel. The aim was to find reliable results (~10% accuracy) regarding total spectrum and peak count rates with faster computation time than a full-Monte Carlo approach. For this purpose, the method is based on depletion calculations with SERPENT2, a point-source kernel method for the collimator response, a rig response matrix and a detector response matrix, both computed with MCNP6. The computational methodology uses as input the fuel properties (dimensions, materials, power history, and cooling time), and the instrumental setup (collimator and detector dimensions and materials).The prediction method was validated using measured data from a high-burnup, short-cooled test fuel rodlet from the Halden reactor. Absolute count rates and ratios of characteristic peaks were compared between predicted and measured spectra, showing a total count rate overestimation of 7% and discrepancies between 2-20% for the single peaks (same order of magnitude of the uncertainty). This level of agreement is deemed sufficient for measurement campaigns planning, and the optimization of spectroscopic instruments for use in gamma scanning and tomography of nuclear fuel.

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Section: Introductionmentioning

confidence: 99%

A Computational Methodology for Estimating the Detected Energy Spectra of the Gamma-Ray Flux From Irradiated Nuclear Fuel

Senis

Elter

Rathore

et al. 2022

IEEE Trans. Nucl. Sci.

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“…In nuclear structure studies, electronically segmented HPGe detectors have been used for gamma-ray tracking applications such as AGATA [1], GRETINA [2], etc. A similar kind of segmented HPGe detector [3,4] has also been proposed for Gamma Emission Tomography (GET) of nuclear fuel. In particular, the GET technique has been used in the examination of nuclear fuel rods exposed to inpile transient tests in material test reactors [5,6,7].…”

Section: Introductionmentioning

confidence: 99%

“…In such GET inspections, high spatial resolution is valuable for studying fragmentation, relocation, and dispersal of fuel from a fuel element or rod. The feasibility of segmented HPGe detector for GET instruments was evaluated through the simulation study in [3], and the detector geometry and segmentation pattern were optimized in [4].…”

Section: Introductionmentioning

confidence: 99%

“…Due to the promising results, an instrument is currently being manufactured for experimental demonstration. In this work, the demonstration device is presented, which is an electronically segmented HPGe detector similar to the proposed design in [3,4], albeit scaled-down with fewer segments and of planar geometry, in order to lower the costs of manufacturing. Aside from lower manufacturing costs of the detector itself, other reasons for choosing the scaled-down planar design for demonstration are its comparatively less complex manufacturing process than the full coaxial one, less expensive associated data acquisition system, and less expensive multi-slit collimator.…”

Section: Introductionmentioning

confidence: 99%

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Calculation of Spatial Response of a Collimated Segmented HPGe Detector for Gamma Emission Tomography by MCNP Simulations

Rathore

Senis

Jansson

et al. 2022

IEEE Trans. Nucl. Sci.

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We have proposed a planar electronically segmented HPGe detector concept in combination with a multi-slit collimator for gamma emission tomography. In this work, the spatial resolution achievable by using the collimated segmented HPGe detector was evaluated, prior to the manufacture and operation of the detector. The spatial response of a collimated segmented HPGe detector concept was evaluated using simulations performed with Monte Carlo N-Particle transport code MCNP6. The full detector and multi-slit collimator system were modeled and for the quantification of the spatial response, the Modulation Transfer Function (MTF) was chosen as a performance metric. The MTF curve was obtained through the calculation of the Line Spread Function (LSF) by analyzing simulated projection data. In addition, tomographic reconstructions of the simulated simplified test objects were made to demonstrate the performance of the segmented HPGe detector in the planned application. For 662 keV photons, the spatial resolution obtained was approximately the same as the collimator slit width for both 100 and 150 mm long collimators. The corresponding spatial resolution at 1596 keV photon energy was almost twice the slit width for 100 mm collimator, due to the partial penetration of the high-energy gamma rays through the collimator bulk. For a 150 mm long collimator, an improved resolution was obtained.

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Development of a GAGG(Ce)-based compact 3D scanning setup for assessment of active volume in γ-ray detectors

Das

Kundu

Palit

et al. 2023

Nuclear Instruments and Methods in Physics Research Section A:

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Geometrical optimisation of a segmented HPGe detector for spectroscopic gamma emission tomography—A simulation study

Cited by 6 publications

References 11 publications

A Computational Methodology for Estimating the Detected Energy Spectra of the Gamma-Ray Flux From Irradiated Nuclear Fuel

A Computational Methodology for Estimating the Detected Energy Spectra of the Gamma-Ray Flux From Irradiated Nuclear Fuel

Calculation of Spatial Response of a Collimated Segmented HPGe Detector for Gamma Emission Tomography by MCNP Simulations

Development of a GAGG(Ce)-based compact 3D scanning setup for assessment of active volume in γ-ray detectors

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