Optimization of Mutual-Shielding Directional γ-Detector

This article presents an improved design of a seven-scintillator directional detector array, which operates on the mutual shielding principle. The optimization process enhances the array's directional accuracy and sensitivity while maintaining the same quantity and volume of scintillators. A un...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2024-05, Vol.71 (5), p.981-991
Main Authors: Eran, Vax, David Nadav, Ben, Yossi, Salomon, Yakir, Knafo, Shay, Dadon, Max, Ghelman, Adrian, Stern, Ehud, Behar, Alon, Osovizky
Format: Article
Language:English
Subjects:
Absorption
Ambiguity
Arrays
Data acquisition
Detectors
detectors array
Direction of arrival
Direction-of-arrival estimation
directional gamma detector
mutual shielding
Optimization
Prototypes
Qualitative analysis
Scintillation counters
Scintillators
Sensitivity
Sensors
Shielding
Simulation
spatial optimization
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Summary:This article presents an improved design of a seven-scintillator directional detector array, which operates on the mutual shielding principle. The optimization process enhances the array's directional accuracy and sensitivity while maintaining the same quantity and volume of scintillators. A unique method is proposed, utilizing the ambiguity metric (AM) to predict the anticipated angular error to the true direction of arrival (DOA). This ambiguity analysis acts as a qualitative assessment, enabling the comparison of the precision and reliability of different array configurations without the need for multiple simulations or the addition of synthetic noise. An additional novel concept introduced is the rotation of the directional detector to acquire two separate measurements from the same source, effectively doubling the data vector to mitigate problematic directions. This article also describes the constructed prototype and its data acquisition (DAQ) system, which includes a time over threshold (TOT) interface for energy-dependent measurements. The measurements from the prototype are compared with the results of the simulations to validate the conclusions derived from the simulations. The methodologies suggested in this article have the potential to substantially improve the accuracy and efficiency of any mutual-shielding directional detector.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2024.3368963