Measurement of Energy Parameters for Electron Gun Heater Currents and Output Dose Rate for Electron Beams from a Prototype Linac

Heuijin Lim; Manwoo Lee; Me Young Kim; Jungyu Yi; Mujin Lee; Sang Ku Kang; Dong Joo Rhee; Dong Hyeok Jeong

doi:10.14316/pmp.2016.27.1.25

Journal List > Prog Med Phys > v.27(1) > 1098509

Go to TopGo to Top Go to BottomGo to Bottom

TOOLS

Lim, Lee, Kim, Yi, Lee, Kang, Rhee, and Jeong: Measurement of Energy Parameters for Electron Gun Heater Currents and Output Dose Rate for Electron Beams from a Prototype Linac

Original Article

Progress in Medical Physics 2016;27(1):25-30.

Published online: 4 March 2016

DOI: https://doi.org/10.14316/pmp.2016.27.1.25

Measurement of Energy Parameters for Electron Gun Heater Currents and Output Dose Rate for Electron Beams from a Prototype Linac

Heuijin Lim, Manwoo Lee, Me Young Kim, Jungyu Yi, Mujin Lee, Sang Ku Kang, Dong Joo Rhee, Dong Hyeok Jeong

Research Center, Dongnam Institute of Radiological & Medical Sciences, Busan, Korea

Correspondence: Dong Hyeok Jeong (physics7@empas.com) Tel:82-51-720-5813, Fax:82-51-720-5826

Received 15 March 2016 Revised 23 March 2016 Accepted 25 March 2016

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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.

Keywords: Electron linac, Gun heater current, Output measurement

References

1. David IT, John BT. Backtothefuture: thehistoryanddevel-opmentoftheclinicallinearaccelerator.PhysMedBiol. 51:R343–R362. 2006.

2. www.kirams.re.kr/khima

3. Kim S, Kang SK, Rhee DJ, et al. :. MeasurementofElectron BeamOutputforthe PrototypeCompactLinac,Progressin MedicalPhysics. 26(1):1–5. 2015.

4. Yi J, Lee M, Lee M, et al. :. FabricationandHighpowerRF testofaC-bandStanding-waveAcceleratingStructurefor MedicalApplication,ICABU(InternationalConferenceonAccele-ratorsandBeamUtilizations)Proceeding. 134–134. 2015.

5. Scott EVB. AnIntroductiontoMassSpectrometry, Widner University, PA, USA. 1998.

6. TRS-277. AbsorbedDoseDeterminationinPhotonand ElectronBeams: AnInternationalCodeofPractice. International Atomic Energy Agency;Vienna: 1997.

7. Li A, Wen D, Chen , et al. :. Astudyofdosimetrycharacteristics ofGAFDM-1260radiochromicFilms,RadPhysChem. 57:103–113. 2000.

8. TRS-398. Absorbeddosedeterminationinexternalbeamra-diotherapy: aninternationalcodeofpracticefordosimetrybased onstandardsofabsorbeddosetowater. International Atomic Energy Agency;Vienna: 2000.

9. Zink K, Wulff J. MonteCarlocalculationsofbeamqualitycor-rectionfactors_ for electron dosimetry with a parallel-plate Roos chamber,PhysMedBiol. 53:1595–1607. 2008.