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Figure 2: (a) Illustration of the changes in the energy spectra obtained from the simulation of a 99mTc point source with increasing the applied voltage. (b) For better comparison, the spectra are shown in the energy range of 120–160 keV.

Figure 2: (a) Illustration of the changes in the energy spectra obtained from the simulation of a <sup>99m</sup>Tc point source with increasing the applied voltage. (b) For better comparison, the spectra are shown in the energy range of 120–160 keV.