Journal of Medical Physics
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Year : 2004  |  Volume : 29  |  Issue : 4  |  Page : 248-253

Determination Of Beam Quality Correction Factors (Kq,qo) For CD High Tech Chamber



Correspondence Address:
M Dinesh Kumar


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The dosimetry formalism is slowly changing from air kerma to absorbed dose to water. CD High Tech chamber is widely used in India and TRS 398 does not provide Ka value for CD High Tech chamber. In this study, we determined the beam quality correction factors Ka for three cylindrical chambers of type CD High Tech, PTW 30001 and FC65, for clinical high-energy photon beams of nominal energies 6, 10 and 15 MV. Cross calibration technique of ionization chamber is used to determine the beam quality correction factors. NE 2571 chamber is used as the reference chamber. Theoretical calculations were made using the basic data available in TRS 277 / TRS 398. Experimentally obtained values of KO are compared with values of Ka from TRS 398 and TG 51. On comparison, maximum deviations of 0.4% for PTW 30001 chamber, and 0.7% for FC 65 chamber are obtained which validate this method to determine Ka at the user level. For CD High Tech chamber, it is observed that the maximum deviation of 0.3% is obtained between the calculated and the experimental values. Further, measured KO values for CD High Tech chamber are compared with NE 2505 chamber. Physical characteristics of these two chambers are comparable. A maximum deviation of 0.5% is found between the KO values of CD High Tech chamber and NE 2505 chamber. KQ values of NE 2505 can also be used for CD High Tech chamber, since the physical characteristics of both the chambers are nearly same.


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