<p>Compton imaging enables high-sensitivity imaging of gamma radiation sources without collimation, making it useful for homeland security, nuclear decommissioning, and space science. This study proposes a position-sensitive bar-shaped detector used for Compton imaging. The bar-shaped scintillator detectors are arranged in a planar array, with signals read out from the dual end of the detector to reduce electronics channels. The detection system is developed in this study with advantages of radiation hardness, high efficiency and low cost. A large sensitive volume of a <InlineEquation ID="IEq1"> <EquationSource Format="TEX">${5}\,\textrm{mm}\times {5}\,\textrm{mm}\times {100}\,\textrm{mm}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>5</mn> <mspace width="0.166667em" /> <mtext>mm</mtext> <mo>×</mo> <mn>5</mn> <mspace width="0.166667em" /> <mtext>mm</mtext> <mo>×</mo> <mn>100</mn> <mspace width="0.166667em" /> <mtext>mm</mtext> </mrow> </math></EquationSource> </InlineEquation> CsI(Tl) scintillator detector, with a light output of 56000 photons/MeV, was used to verify position and energy resolution. Considering the surface roughness and reflectors, the experiment results indicate that the bar-shaped scintillators can achieve an average position resolution better than 5 mm and 7.2<InlineEquation ID="IEq2"> <EquationSource Format="TEX">$\%$</EquationSource> <EquationSource Format="MATHML"><math> <mo>%</mo> </math></EquationSource> </InlineEquation>(FWHM) energy resolution at 662 keV. Therefore, a balance between position resolution and energy resolution can be achieved by the bar-shaped scintillators with few readout electronics. The imaging detection system of <InlineEquation ID="IEq3"> <EquationSource Format="TEX">${80}\,\textrm{cm}^3$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>80</mn> <mspace width="0.166667em" /> <msup> <mtext>cm</mtext> <mn>3</mn> </msup> </mrow> </math></EquationSource> </InlineEquation> sensitive volume, constructed with bar-shaped scintillators, can be used for Compton imaging in an energy range of 250 keV to 3 MeV.</p>

Optimization of a dual-end readout bar-shaped scintillator detector for Compton imaging

期刊论文
发表日期：

2026年5月19日

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Cheng-Shuai Tian,
Jian Yang,
Guo-Qiang Zeng,
Xin-Yu Yang,
Hao-Wen Deng,
Chuan-Hao Hu,
Chun-Di Fan

摘要

Compton imaging enables high-sensitivity imaging of gamma radiation sources without collimation, making it useful for homeland security, nuclear decommissioning, and space science. This study proposes a position-sensitive bar-shaped detector used for Compton imaging. The bar-shaped scintillator detectors are arranged in a planar array, with signals read out from the dual end of the detector to reduce electronics channels. The detection system is developed in this study with advantages of radiation hardness, high efficiency and low cost. A large sensitive volume of a ${5}\,\textrm{mm}\times {5}\,\textrm{mm}\times {100}\,\textrm{mm}$ $5 mm \times 5 mm \times 100 mm$ CsI(Tl) scintillator detector, with a light output of 56000 photons/MeV, was used to verify position and energy resolution. Considering the surface roughness and reflectors, the experiment results indicate that the bar-shaped scintillators can achieve an average position resolution better than 5 mm and 7.2 $\%$ $%$ (FWHM) energy resolution at 662 keV. Therefore, a balance between position resolution and energy resolution can be achieved by the bar-shaped scintillators with few readout electronics. The imaging detection system of ${80}\,\textrm{cm}^3$ $80 {cm}^{3}$ sensitive volume, constructed with bar-shaped scintillators, can be used for Compton imaging in an energy range of 250 keV to 3 MeV.