A gamma-backscattering imaging device dubbed Compton Camera, developed at GSI (Darmstadt, Germany) and modified and studied at the Nuclear Physics Group of the National University of Colombia in Bogotá, uses the back-to-back emission of two gamma rays in the positron annihilation to construct a bidimensional image that represents the distribution of matter in the field-of-view of the camera. This imaging capability can be used in a host of different situations, for example, to identify and study deposition and structural defects, and to help locating concealed objects, to name just two cases. In order to increase the understanding of the response of the Compton Camera and, in particular, its image formation process, and to assist in the data analysis, a simulation of the camera was developed using the GEANT4 simulation toolkit. In this work, the images resulting from different experimental conditions are shown. The simulated images and their comparison with the experimental ones already suggest methods to improve the present experimental device
Gamma-ray and neutron spectra from the 18 O + 76 Se reaction at 15.3 MeV/u were measured with the EDEN array of liquid scintillators at the LNS. The results were compared to GEANT Hadrontherapy physics list simulations in order to assess the reliability of this model for the development of the NUMEN project. A good agreement with the shape of the experimental gamma-ray spectra and a reasonable agreement with the total count rates were obtained. The gamma spectra originated from the nuclear reactions were selected by time coincidence with the Superconducting Cyclotron radio-frequency reference signal. The random coincidence background rate was appropriately described
Directional gamma sensing from covariance processing of inter-detector Compton crosstalk energy asymmetries Rev. Sci. Instrum. 85, 063504 (2014); 10.1063/1.4882319 Measurement of the gamma-ray sensitivity and signal-to-noise ratio of a new scattered-electron detector Rev. Sci. Instrum. 79, 093303 (2008);
The γ-backscattering imaging techniques are alternative methods to the transmission techniques to determine the amount and distribution of matter in objects. Images obtained with a γ-backscattering device are presented. In order to increase the understanding of the image formation process and to assist in the data analysis, a simulation of the camera was developed using the Geant4 simulation toolkit. Simulation and experimental results suggest that the device has promising potential industrial applications.
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