Figure 13.

Multiple source localization with the prototype under the following test conditions: a ¹³³Ba source positioned at (θ, φ) = (0°, −45°), a ¹³⁷Cs source positioned at (θ, φ) = (0°, −10°), and a ⁶⁰Co source positioned at (θ, φ) = (0°, 15°). The reconstructed images at the corresponding energy slices and the reconstructed initial energy spectra after 3 iterations are shown. The vertical axis of the reconstructed energy spectra is represented by normalized intensity. (a) The simulation results. (b) The experimental results.