Nuclear Techniques, 2019, 42(7): 0-070203-6.Ī method for material identification based on X-ray dual-energy backscatter detection Yuankun WANG,Qian WANG,Tao WANG,Jing LIU.Įffect of secondary electron non-equilibrium on the absorbed doses of CMOS device sensitive area and total ionizing dose effect. Key words: Compton camera, Monte Carlo simulation, Backprojection imaging reconstruction algorithm The next step is improving simulated Compton camera to study its performance parameters, while the maximum likelihood algorithm could improve the spatial resolution of Compton camera. Conclusion: Because of the existence of large amount of data, Compton camera needs long calculation time for measuring data. Results: Using backprojection algorithm and simulated Compton camera, when the distance between source and the scattering detector is 40 mm, the spatial resolution is FWHM=8.0 mm, angular resolution is 3° and γ photon imaging efficiency is 0.38%, which are better than most of the pinhole and coded aperture γ camera imaging. Backprojection imaging reconstruction algorithm is studied for getting the reconstruction of source. Methods: By using Monte Carlo simulation software GEANT4, a Compton camera with stripes structure is designed and data for reconstruction image of source is read out. Purpose: This study aims to build a Compton camera via Monte Carlo simulation and test its backprojection algorithm. All these characters are favorable to their electrochemical performance when MnO 2/Carbon-CNTs are used as electrode for supercapacitor or other energy storage systems.Background: Due to its imaging principle advantages and the development of detectors, nuclear electronics, Compton camera has once again put forward. Such a superior electrochemical performance can be related to the interpenetrating network of the sample, in which CNTs can not only increase the electrical conductivity of the material but also play a role in supporting and fastening the 3D architectures, which also improves greatly the specific surface area of the composite. The capacitance measured with a three-electrode configuration using 2 M KOH aqueous solution as electrolyte at current density of 0.5 A g −1 reaches 508.8 F g −1. The MnO 2/Carbon-CNTs have been explored as electrode for supercapacitors and they show excellent performance. As results, carbon content in the resulted MnO 2/Carbon-CNTs networks can be turned from 7 to 18 wt% by simply controlling the concentration of KMnO 4 and the reaction time. Due to the coexistence of amorphous carbon and carbon nanotubes (CNTs) and their diversity upon oxidization, the CNTs can be remained preferentially after the oxidizing by KMnO 4 solution. 3D interpenetrating networks of carbon modified MnO 2 nanocrystals being connected by carbon nanotubes (MnO 2/Carbon-CNTs) have been prepared using cobalt modified Carbon-CNTs, which is derived from CNTs joined ZIF-67 MOF crystals, as sacrificial template.
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