Dosimetry of 99m Tc (DTPA, DMSA and MAG3) used in renal function studies of newborns and children.

The dose to kidneys of newborns and 1-year old children was calculated using the MIRD methodology. In order to perform renal studies radiopharmaceutical like 99m Tc-DTPA, 99m Tc-MAG3 and 99m Tc-DMSA are used. Here, besides the anatomic and structure information of kidneys another data are provided in benefit of patient, however during the radioisotope decay emitted radiations delivers, totally or partially, their energy. Therefore is important to estimate the internal radiation dose of the organs. The largest dose to kidneys comes from the self-dose and it is due to the charged particles emitted during 99m Tc decay. From the three radiopharmaceutical here used the largest dose to kidneys is due to 99m Tc-DMSA, and the smaller dose is due to 99m Tc-MAG3.