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Radiation therapy has been used in the treatment of malignant diseases since its discovery. It has been found that the use of radiation in the treatment in inaccurate ways causes irreparable damage and does not achieve the desired goal of treatment by itself. It was very important to use in vivo diode dosimetry techniques for radiotherapy measurement to accurately check the dose administered and deposited by the patient to during treatment. To achieve this goal, the absorbed dose verification program was initiated by using the diode detectors in vivo dosimetry system for entrance dose during treatment. The aim of this study was to verily the response of diodes p-type (Isorad) use in radiotherapy and to establish calibration procedure for diodes and to evaluate entrance dose obtained by the treatment planning system with measured dose using four Iso-rad diode detectors conducts in this study. Calibration of the diodes was done using Cobalt-60 machine, calibration factors, correction factors were determined. This practice was performed at NSICLibya. Diodes were calibrated for making absorbed dose measurements. Various correction factors (linearity, SSD, field size, angle of incidence, wedge and tray) were determined for diode in vivo dosimtery system. The measurements were preformed in sold phantom in order to validate the in-vivo procedure. This investigation revealed that clinical dosimetry using diodes is simple, provides immediate results and is useful quality assurance tool for dose delivery. The results indicate that the diodes exhibit excellent linearity, dose reproducibility and minimal anisotropy; that they can be used with confidence for patient dose verification as known from the literature [1.3]. Furthermore, diodes render real time verification of the dose delivered to patients.

Calibration and Correction Factors of ISO-Rad Diodes P-Type for In-Vivo Dosimetry in External Beam Therapy with Co60