NT & RP Journal
A COMPARISON OF IN-AIR AND IN-WATER CALIBRATION OF A DOSIMETRY SYSTEM USED FOR RADIATION DOSE ASSESSMENT IN CANCER THERAPY
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Vol. XXV, No. 1, Pp. 1-68
April 2010
UDC 621.039+614.876:504.06
ISSN 1451-3994

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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

FULL PAPER IN PDF FORMAT (353 KB)

Vinča Institute of Nuclear Sciences :: Designed by milas :: July 2007
Last updated on September, 2010