Four choices for the x-ray source can be done, 100kev, 150kev, 250kev, and 350kev. In this range of energy, Compton scattering and photoelectric is concerned. When a photon emits, correspondingly, a red block appears under the spectrum curve indicating the energy of the photon. The plate is divided into grids . The type and the number of interactions are counted in every grid.
Color map is used to illustrate the statistic numbers of interaction in each grid.
The scale of the color map is indicated by the color bar . It will appear when the summary button is clicked. Summary gives a result based on counting 30000 photons passing into the plate.