Monte Carlo and experimental analysis of a novel directional rotating scatter mask gamma detection system

Logan, Julie V.; Holland, Darren E.; Burggraf, Larry W.; Clinton, Justin; O’Day, Buckley E.

doi:10.1016/j.nima.2019.162698

Cited by 5 publications

(5 citation statements)

References 7 publications

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“…Logan et al [8] showed statistical agreement between experimental and simulated DRCs using GEANT4 [9] and agreement of simulated DRCs [7] using GEANT4 and MCNP [10]. Thus, this work will use MCNP to simulate the experimental DRCs needed to evaluate each RSM design's performance.…”

Section: Rsm Designmentioning

confidence: 86%

“…Instead of using only the full energy peak (FEP), the DRC for this work is formed by summing all counts above 200 keV to increase the source direction identification's efficiency. The 200 keV limit was chosen as Logan et al noted discrepancies for counts below this value due to scatter in the environmental elements not considered in the model [7].…”

Section: Rsm Designmentioning

confidence: 99%

“…However, due to requirements for the Hadamard method, (which is discussed in Section 2.3.4) the proposed designs are broken into 32 discrete angles in resulting in = 11.25 • and = 5.625 • for 30 angles in . The RSM design is to be optimized for a 137 Cs point source located 34 in from the center of the detector, mimicking Logan et al's setup [7]. To simulate the relative source rotation in MCNP, the mask is stationary, while the source is rotated in spherical coordinates every increment for from 0 to 348.75 • and for each from 5.625 • to 168.75 • .…”

Section: Rsm Designmentioning

confidence: 99%

“…The rotating scatter mask (RSM) concept offers many benefits over other gamma source position identification detectors. Specifically, it ''provides a nearly 4 field-of-view, operates for a broad range of gamma energies, and has a relatively simple design [7]''. This system uses a Fig.…”

Section: Introductionmentioning

confidence: 99%

“…spherical reference system, where is the azimuthal and the polar angle. The mask works by attenuating and scattering the incoming particles in order to produce unique detector response curves [7]. To obtain the measurements for the position identification, the mask starts at an initial and position.…”

Section: Introductionmentioning

confidence: 99%

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Rotating scatter mask optimization for gamma source direction identification

Holland

Bevins

Burggraf

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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Rotating scattering masks have shown promise as an inexpensive, lightweight method with a large field-of-view for identifying the direction of a gamma emitting source or sources. However, further examination of the current rotating scattering mask design shows that changing the geometry may improve the identification by reducing or eliminating degenerate solutions and lower required count times. These changes should produce more linearly independent characteristics for the mask, resulting in a decrease in the mis-identification probability. Three approaches are introduced to generate alternative mask geometries. The eigenvector method uses a spring-mass system to create a geometry basis. The binary approach uses ones and zeros to represent the geometry with many possible combinations allowing for additional design flexibility. Finally, a Hadamard matrix is modified to examine a decoupled geometric solution. Four criteria are proposed for evaluating these methodologies. An analysis of the resulting detector response matrices demonstrates that these methodologies produced masks with superior identification characteristics than the original design. The eigenvector approach produces the least linearly dependent results, but exhibits a decrease in average efficiency. The binary results are more linearly dependent than the eigenvector approach, but this design achieves a higher average efficiency than original. The Hadamard-based method produced a lower maximum, but a higher average linear dependence than the original design. Further possible design enhancements are discussed.

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