Journal of Medical Physics
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ORIGINAL ARTICLE
Year : 2016  |  Volume : 41  |  Issue : 4  |  Page : 234-239

Dosimetric evaluation of newly developed well-type ionization chamber for use in the calibration of brachytherapy sources


1 Department of Radiation Physics, Kidwai Memorial Institute of Oncology, Bengaluru, Karnataka, India
2 ROSALINA@ India Private Limited, Mumbai, Maharashtra, India

Correspondence Address:
Sathiyan Saminathan
Department of Radiation Physics, Kidwai Memorial Institute of Oncology, Dr. M. H. Marigowda Road, Bengaluru - 560 029, Karnataka, India
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0971-6203.195187

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The well-type ionization chamber has been designed for convenient use in brachytherapy source strength calibration. The chamber has a volume of 240 cm 3 , weight of 2.5 kg, and is open to atmospheric conditions. The well-type ionization chamber dosimetric characteristics such as leakage current, stability, scattering effect, ion collection efficiency, and nominal response with energy were studied. The evaluated dosimetric characteristics of well-type ionization chamber were compared with two other commercially available well-type ionization chambers. The study shows that the newly developed well-type ionization chamber is reliable for air-kerma strength calibration. The results obtained confirm that this chamber can be used for the calibrations of high-dose rate brachytherapy sources.


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