It is generally accepted that children's organs are more sensitive to radiation than adults, due to their growth rate. Therefore, evaluating the absorbed dose in children to avoid irrecoverable damage is highly crucial. In this work, absorbed dose by different organs of children within the SPECT imaging for the Tc-MAG3, Tc-DTPA, and Tc-DMSA that are commonly employed for pediatric patients, were estimated through the use of Monte Carlo simulation and the University of Florida's (UF) voxel-wise phantoms at the ages of 4, 8, 11, and 14-years old. The results showed that the highest absorbed dose was by kidneys and when Tc-DMSA was used. Also, the highest and lowest absorbed dose in the organs occurred when Tc-DMSA and Tc-MAG3 were used, respectively. The simulation results were in good agreement with the ICRP 128 data.
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