Source of Support: None, Conflict of Interest: None
Effective dose estimates were made for three renal agents namely Tc-99m - DTPA, Tc-99m - MAG3 and 1-131 - OIH. Biodistribution and mean absorbed dose to various organs / tissues due to Tc-99m - DTPA and 1-131 - OIH were taken from ICRP-53. Similar data for Tc-99m - MAG3 were taken from other published literature. Effective doses due to these agents were computed using earlier as well as the revised values of tissue weighting factors. It is shown that effective dose due to 1-131 - OIH is more than ten times the dose due to Tc-99m labelled renal agents. The revision of tissue weighting factor values results in lowering of the numerical values of effective dose estimates.