Integral and Gonad Radiation Doses in Radioisotope Renogram and Radiographic Intravenous Pyelogram Examinations

Integral and gonad radiation doses in radioisotope renogram and radiographic intravenous pyelogram examinations have been assessed using methods which are considered to be of general application. The calculated values indicate that the integral dose in a renogram examination is about one-ten thousandth of that in an average I.V.P. and that the gonad doses are only of the order of the daily dose from natural background radiation. It has also been shown that if thyroid uptake of free iodine present in the test material is not prevented by first administering a saturation dose of non-radioactive iodine, the integral dose from a renogram examination could be increased by a factor of up to about 10.