Open AccessA comparison of in-air and in-water calibration of a dosimetry system used for radiation dose assessment in cancer therapy
Author(s) -
Waheed Arshed,
Khalid Mahmood,
Ikramullah Qazi,
Asad Ullah,
Perveen Akhter,
S.S. Ahmad,
Zeeshan Jamil
Publication year - 2010
Publication title -
nuclear technology and radiation protection
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.31
H-Index - 16
eISSN - 1452-8185
pISSN - 1451-3994
DOI - 10.2298/ntrp1001051a
Subject(s) - kerma , dosimetry , calibration , imaging phantom , absorbed dose , nuclear medicine , radiation , radiation therapy , medical physics , medicine , materials science , optics , physics , mathematics , radiology , statistics
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