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KMID : 0364920120370040191
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Journal of Radiation Protection and Research
2012 Volume.37 No. 4 p.191 ~ p.196
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Preliminary Study of Performance Evaluation of a Dual-mode Compton Camera by Using Geant4
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Park Jin-Hyung
Seo Hee
Kim Seong-Hoon
Kim Young-Su
Kim Chan-Hyeong
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Abstract
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A double-scattering type Compton camera which is appropriate to imaging a high-energy gamma source has been developed for nuclear material surveillance at Hanyang University. The double-scattering type Compton camera can provide high imaging resolution; however, it has disadvantage of relatively low imaging sensitivity than existing single-scattering type Compton camera. In this study, we introduce a novel concept of a dual-mode Compton camera which incorporates two different types of Compton camera, i.e., single- and double-scattering type. The dual-mode Compton camera can operate high-resolution mode and high-sensitivity mode in a single system. To maximize its performance, the geometrical configuration was optimized by using Geant4 Monte Carlo simulation toolkit. In terms of imaging sensitivity, high-sensitivity mode had higher sensitivity than high-resolution mode up to 100 times while high imaging resolution of the double-scattering Compton camera was maintained.
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KEYWORD
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Compton camera, Dual-mode, Nuclear material surveillance, Geant4
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