Pages: 51-54

Authors: Waheed Arshed, Khalid Mahmood, Ikramullah Qazi, Asad Ullah, Perveen Akhtar, Syed Salman Ahmad, Zeeshan Jamil

Abstract

An accurate calibration of the therapy level radiation dosimetry system has a pivotal role in the accuracy of dose delivery to cancer patients. The two methods used for obtaining a tissue equivalent calibration of the system: air kerma calibration and its conversion to a tissue equivalent value (absorbed dose to water) and direct calibration of the system in a water phantom, have been compared for identical irradiation geometry. It was found that the deviation between the two methods remained within a range of 0% to ±1.7% for the PTW UNIDOS dosimetry system. This means that although the recommended method is in-water calibration, under exceptional circumstances, in-air calibration may be used as well.

Key words: absorbed dose calibration, kerma to absorbed dose conversion

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