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KMID : 1038720160270010025
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Progress in Medical Physics
2016 Volume.27 No. 1 p.25 ~ p.30
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Measurement of Energy Parameters for Electron Gun Heater Currents and Output Dose Rate for Electron Beams from a Prototype Linac
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Lim Heui-Jin
Lee Man-Woo
Kim Me-Young
Yi Jung-Yu
Lee Mu-jin
Kang Sang-Ku
Rhee Dong-Joo
Jeong Dong-Hyeok
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Abstract
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The dosimetric characteristics were experimentally evaluated for electron beams from the prototype linac developed for radiotherapy units. This paper focuses on the electron beam output and energy variations as a function of electron gun heater current. The electron energy was derived from its mean and most probable energies measured by film dosimetry. The electron beam output at the maximum electron energy was measured with the plane parallel ionization chamber in water using TRS-398 dosimetry protocol. The mean energy and the most probable energy of the electron beam were 6.54~3.31 MeV and 5.94~2.80 MeV at electron gun current of 2.02~2.50 A respectively. The output dose rate for an electron beam of mean energy 6.54 MeV was 5.41 Gy/min ±1.5% at the reference depth in water.
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KEYWORD
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Electron linac, Gun heater current, Output measurement
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