DOI QR코드

DOI QR Code

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

연구용 선형가속기의 전자총 가열 전류에 따른 전자선의 에너지 인자 측정과 출력 측정 연구

  • Lim, Heuijin (Research Center, Dongnam Institute of Radiological & Medical Sciences) ;
  • Lee, Manwoo (Research Center, Dongnam Institute of Radiological & Medical Sciences) ;
  • Kim, Me Young (Research Center, Dongnam Institute of Radiological & Medical Sciences) ;
  • Yi, Jungyu (Research Center, Dongnam Institute of Radiological & Medical Sciences) ;
  • Lee, Mujin (Research Center, Dongnam Institute of Radiological & Medical Sciences) ;
  • Kang, Sang Ku (Research Center, Dongnam Institute of Radiological & Medical Sciences) ;
  • Rhee, Dong Joo (Research Center, Dongnam Institute of Radiological & Medical Sciences) ;
  • Jeong, Dong Hyeok (Research Center, Dongnam Institute of Radiological & Medical Sciences)
  • 임희진 (동남권원자력의학원 연구센터) ;
  • 이만우 (동남권원자력의학원 연구센터) ;
  • 김미영 (동남권원자력의학원 연구센터) ;
  • 이준규 (동남권원자력의학원 연구센터) ;
  • 이무진 (동남권원자력의학원 연구센터) ;
  • 강상구 (동남권원자력의학원 연구센터) ;
  • 이동주 (동남권원자력의학원 연구센터) ;
  • 정동혁 (동남권원자력의학원 연구센터)
  • Received : 2016.03.15
  • Accepted : 2016.03.25
  • Published : 2016.03.31

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 ${\pm}1.5%$ at the reference depth in water.

본 연구에서는 의료용 선형가속기 제작을 위해 개발된 연구용 선형가속기의 전자선에 대한 선량학적 특성을 실험적으로 평가하였다. 본 논문에서는 전자총 가열 전류에 따른 에너지의 변화와 출력 흡수선량 측정 결과를 보고하고자 한다. 전자선의 에너지는 필름 측정법을 써서 평균에너지와 최빈에너지의 관점에서 결정하였다. 출력 흡수선량은 최적 에너지에 대하여 평행평판형 전리함을 사용하여 물속 깊이선량율을 측정하고 TRS-398 프로토콜에 따라 결정하였다. 측정 결과 전자총 가열 전류 2.02~2.50 A에서 평균에너지와 최빈에너지는 5.94~2.80 MeV와 6.54~3.31 MeV로 변화하였다. 그리고 평균에너지 5.94 MeV의 전자선에 대해 물속 기준 깊이에서 출력 흡수선량은 5.41 Gy/min으로 나타났다.

Keywords

References

  1. David IT, John BT: Back to the future: the history and development of the clinical linear accelerator. Phys Med Biol 51: R343-R362(2006) https://doi.org/10.1088/0031-9155/51/13/R20
  2. www.kirams.re.kr/khima
  3. Kim S, Kang SK, Rhee DJ et al.: Measurement of Electron Beam Output for the Prototype Compact Linac, Progress in Medical Physics 26(1): 1-5(2015) https://doi.org/10.14316/pmp.2015.26.1.1
  4. Yi J, Lee M, Lee M et al.: Fabrication and High power RF test of a C-band Standing-wave Accelerating Structure for Medical Application, ICABU(International Conference on Accelerators and Beam Utilizations) Proceeding: 134-134(2015)
  5. Scott EVB: An Introduction to Mass Spectrometry, Widner University, PA, USA (1998)
  6. TRS-277: Absorbed Dose Determination in Photon and Electron Beams: An International Code of Practice. International Atomic Energy Agency, Vienna (1997)
  7. Li A, Wen D, Chen et al.: A study of dosimetry characteristics of GAF DM-1260 radiochromic Films, Rad Phys Chem 57: 103-113(2000) https://doi.org/10.1016/S0969-806X(99)00345-X
  8. TRS-398: Absorbed dose determination in external beam radiotherapy: an international code of practice for dosimetry based on standards of absorbed dose to water. International Atomic Energy Agency, Vienna (2000)
  9. Zink K, Wulff J: Monte Carlo calculations of beam quality correction factors $k_{Q}$ for electron dosimetry with a parallel-plate Roos chamber, Phys Med Biol 53: 1595-1607(2008) https://doi.org/10.1088/0031-9155/53/6/006

Cited by

  1. Electron Energy Distribution for a Research Electron LINAC vol.28, pp.2, 2017, https://doi.org/10.14316/pmp.2017.28.2.49
  2. Development of a Wide Dose-Rate Range Electron Beam Irradiation System for Pre-Clinical Studies and Multi-Purpose Applications Using a Research Linear Accelerator vol.31, pp.2, 2016, https://doi.org/10.14316/pmp.2020.31.2.9