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Volume: 29 | Article ID: art00021
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Evaluation of Major Factors Affecting Spatial Resolution of Gamma-Rays Camera
  DOI :  10.2352/ISSN.2470-1173.2017.12.IQSP-232  Published OnlineJanuary 2017
Abstract

Gamma-rays camera is mainly used in image diagnostics of intense pulse radiation sources. The spatial resolution of the camera was measured on a 60Co gamma-rays source with edge method. The spatial resolution MTF (modulation transfer function) at the 10% intensity was about 2 lp/mm and the maximal single-noise ratio (SNR) of the camera was found to be about 5:1. In addition, the spatial resolution of the camera was measured with pulse X-rays with 0.3 MeV in average energy and exclusion of effects of secondary electrons from consideration. Accordingly, the spatial resolution MTF at the 10% intensity was about 5lp/mm, verifying effects of secondary electrons induced by 1.25MeV gamma-rays in the scintillator upon the spatial resolution. Based on our analysis, dispersion sizes of secondary electrons in the scintillator are about 0.4 mm∼0.6 mm. Comparatively, as indicated by detailed analysis of spatial resolutions of the MCP image intensifier and CCD devices, both have little effect on the camera's spatial resolution and could be well neglected.

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Hongwei Xie, Jinchuan Chen, Qiang Yi, Faqiang Zhang, Linbo Li, "Evaluation of Major Factors Affecting Spatial Resolution of Gamma-Rays Camerain Proc. IS&T Int’l. Symp. on Electronic Imaging: Image Quality and System Performance XIV,  2017,  pp 147 - 151,  https://doi.org/10.2352/ISSN.2470-1173.2017.12.IQSP-232

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