The use of TL detectors in dosimetry of systemic radiation therapy

A method for determining absorbed doses to organs in systemic radiation the rapy (SRT) is evaluated. The method, based on thermoluminescent (TL) dosime ters placed on the patient's skin, was Validated and justified through a ph antom study showing that the difference between measured (TL dosimeters in the phantom) and derived (TL method) Values is within 10%. Six radioimmunot herapy (RIT) patients with widespread intraperitoneal pseudomyxoma were als o studied. In dose evaluations, special emphasis was on kidneys. In additio n to the TL method, the absorbed doses to kidneys were calculated using MIR D formalism and a point dose kernel technique. We conclude that in SRT the described TL method can be used to estimate the absorbed doses to those cri tical organs near the body surface within 50% (1 SD).