Journal of Medical Physics
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Year : 2006  |  Volume : 31  |  Issue : 2  |  Page : 83-88

The non-uniformity correction factor for the cylindrical ionization chambers in dosimetry of an HDR 192Ir brachytherapy source

1 Department of Physics, Govt. College of Science, Raipur, India
2 Department of Medical Physics, Acharya Harihar Regional Cancer Centre, Cuttack, India
3 Health Physics Unit, Institute of Physics, Bhubaneswar, India

Correspondence Address:
Narayan Prasad Patel
Department of Medical Physics, Acharya Harihar Regional Cancer Centre, Cuttack - 753007
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Source of Support: None, Conflict of Interest: None

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The aim of this study is to derive the non-uniformity correction factor for the two therapy ionization chambers for the dose measurement near the brachytherapy source. The two ionization chambers of 0.6 cc and 0.1 cc volume were used. The measurement in air was performed for distances between 0.8 cm and 20 cm from the source in specially designed measurement jig. The non-uniformity correction factors were derived from the measured values. The experimentally derived factors were compared with the theoretically calculated non-uniformity correction factors and a close agreement was found between these two studies. The experimentally derived non-uniformity correction factor supports the anisotropic theory.

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