DETERMINATION OF THE EFFECTIVE POINT OF MEASUREMENT OF CYLINDRICAL IONIZATION CHAMBERS FOR ELECTRON BEAMS WITH DIFFERENT ENERGIES

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BEHROOZ MOHAMMAD ALI; TAHMASEBI BIRGANI MOHAMMAD JAVAD; ALAH SHAHBAZIAN HESHMAT; BAHARIFARD SOHEILA; FATAHI ASL JAFAR

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Journal: Jundishapur Scientific Medical Journal Year:2013 | Volume:12 | Issue:2 (83) Page(s): 169-176

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Title

DETERMINATION OF THE EFFECTIVE POINT OF MEASUREMENT OF CYLINDRICAL IONIZATION CHAMBERS FOR ELECTRON BEAMS WITH DIFFERENT ENERGIES

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Keywords

CYLINDRICAL IONIZATION CHAMBERQ2

PRECENT DEPTH DOSE CURVEQ2

EFFECTIVE POINT OF MEASUREMENTQ2

ELECTRON BEAMSQ2

Abstract

Background and Objective: In order to measure the absorbed dose due to electron beam irradiation at the reference point of a medium, part of this medium is replaced by a CYLINDRICAL IONIZATION CHAMBERs. Thus changes will appear in attenuation and scattering of the radiation. In order to assess the displacement effect, an EFFECTIVE POINT OF MEASUREMENT uses as the reference point. This effective point is taken upstream of the geometrical center of the chamber.This EFFECTIVE POINT OF MEASUREMENT depends on every detail of the chamber design, energy and field size. So, in the different researches on this point, various values have been reported for CYLINDRICAL IONIZATION CHAMBER. The purpose of this study was to analyse the dosimetric information of ELECTRON BEAMS and determine the analytical EFFECTIVE POINT OF MEASUREMENT in CC13 ionization chamber.Subjects and Methods: In this study a CC13 ionization chamber was used for dose determination of 9, 12 and 15MeV ELECTRON BEAMS of Varian accelerator of Ahwaz Golestan hospital in different field sizes of 6×6cm2up to 25×25cm2 applicators. Measurement was made in blue phantom, up to 30mm depth. The PDD curve was plotted separately for all treatment electron fields. The table curve 2D software was used for analyzing experimental data. Then critical point for each curve was calculated.Results: The torsion area is caused by changing environment from air to phantom (water) during measuring of ionization.Also, with increased energy and field size, mean EFFECTIVE POINT OF MEASUREMENT is altered.Conclusion: For CC13 ionization chamber, the mean value is obtained as 0.9r.

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APA: Copy

BEHROOZ, MOHAMMAD ALI, TAHMASEBI BIRGANI, MOHAMMAD JAVAD, ALAH SHAHBAZIAN, HESHMAT, BAHARIFARD, SOHEILA, & FATAHI ASL, JAFAR. (2013). DETERMINATION OF THE EFFECTIVE POINT OF MEASUREMENT OF CYLINDRICAL IONIZATION CHAMBERS FOR ELECTRON BEAMS WITH DIFFERENT ENERGIES. JUNDISHAPUR SCIENTIFIC MEDICAL JOURNAL, 12(2 (83)), 169-176. SID. https://sid.ir/paper/12908/en

Vancouver: Copy

BEHROOZ MOHAMMAD ALI, TAHMASEBI BIRGANI MOHAMMAD JAVAD, ALAH SHAHBAZIAN HESHMAT, BAHARIFARD SOHEILA, FATAHI ASL JAFAR. DETERMINATION OF THE EFFECTIVE POINT OF MEASUREMENT OF CYLINDRICAL IONIZATION CHAMBERS FOR ELECTRON BEAMS WITH DIFFERENT ENERGIES. JUNDISHAPUR SCIENTIFIC MEDICAL JOURNAL[Internet]. 2013;12(2 (83)):169-176. Available from: https://sid.ir/paper/12908/en

IEEE: Copy

MOHAMMAD ALI BEHROOZ, MOHAMMAD JAVAD TAHMASEBI BIRGANI, HESHMAT ALAH SHAHBAZIAN, SOHEILA BAHARIFARD, and JAFAR FATAHI ASL, “DETERMINATION OF THE EFFECTIVE POINT OF MEASUREMENT OF CYLINDRICAL IONIZATION CHAMBERS FOR ELECTRON BEAMS WITH DIFFERENT ENERGIES,” JUNDISHAPUR SCIENTIFIC MEDICAL JOURNAL, vol. 12, no. 2 (83), pp. 169–176, 2013, [Online]. Available: https://sid.ir/paper/12908/en

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