Salim, Nor Liyana (2016) Out-of-field dosimetry on photon and electron beam using gafchromic ebt3 film. Project Report. Universiti Sains Malaysia. (Submitted)
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Abstract
The purpose of this study is to experimentally investigate the out of field dose in the solid water phantom using Gafchromic EBT3 film. The study was carried out with 6 MV, 10 MV, 6 MeV and 15 MeV energy beams from Siemens Primus linear accelerator with constant dose rate of 200 monitor unit (MU). The measurements were performed using the 30x30x15 cm solid water phantom at maximum depth dose (dmax) on 5x5 cm 10x10 cm2 and 15x15 cm2 at lateral distances up to 19 cm from the field edge. All of the percentage of out of field dose measurement were normalized at 0 cm. The results for 6 MV photon beam show approximately 0.05% , 0.07% and 0.71% of the prescribed dose outside the field while for 10 MV photon beams, 0.68%, 0.30% and 0.56% was measured respectively for 5x5 cm2,10x10 cm2 and 15x15 cm2 field size at 19 cm distance. For electron beam, an appearance of peak dose have been observed around 11 - 19 cm out of the field edge for all field sizes and energies. For 6 MeV electron beams, 4.7% of the prescribed dose appeared as highest peak dose for 5x5 cm2 at 11 cm and no peak dose was evidenced at the 10x10 cm2 and 15x15 cm2. For 15 MeV electron beams, 1.93%, 4.11% and 2.13% of the prescribed dose resulted as the out of field dose for respectively 5x5 cm2, 10x10 cm2 and 15x15 cm2. In summary, the out of field dose decrease as distance increase from the field edge and increase with increasing energy and field size for both photon and electron beams. This work can be used as the dose estimation to the organ at risk or healthy tissue outside the treatment field for cancer’s patient receiving external beam radiation as a part of treatment, as well as in studies exploring the radiotherapy long-terms effects.
| Item Type: | Monograph (Project Report) |
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| Uncontrolled Keywords: | dosimetry, photon, electron beam, gafchromic ebt3 film |
| Subjects: | R Medicine > R Medicine (General) > R735-854 Medical education. Medical schools. Research R Medicine > RC Internal medicine > RC71-78.7 Examination. Diagnosis Including raiography |
| Divisions: | Kampus Kesihatan (Health Campus) > Pusat Pengajian Sains Kesihatan (School of Health Sciences) > Monograph |
| Depositing User: | Mr Husnan Budin |
| Date Deposited: | 21 Nov 2024 00:45 |
| Last Modified: | 21 Nov 2024 00:45 |
| URI: | http://eprints.usm.my/id/eprint/61242 |
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