[논문]콤팩트 전자 선형가속기 시작품의 출력측정에 관한 연구

김성우; 강상구; 이동주; 임희진; 이만우; 이준규; 이무진; 양광모; 노태익; 정동혁

doi:10.14316/pmp.2015.26.1.1

콤팩트 전자 선형가속기 시작품의 출력측정에 관한 연구
Measurement of Electron Beam Output for the Prototype Compact Linac 원문보기

Progress in Medical Physics = 의학물리, v.26 no.1, 2015년, pp.1 - 5

초록
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의료용 및 산업용으로 활용하기 위한 C-밴드형 콤팩트 선형가속기의 개발이 동남권원자력의학원에서 진행되고 있다. 본 논문에서는 선형가속기 시작품에서 발생한 전자빔의 출력 측정 결과를 보고하고자 한다. 출력 측정은 물흡수선량에 대해 교정된 Exradin-A10 마커스형 평행평판형 전리함을 사용하여 물속 기준 깊이에서 IAEA TRS-398 프로토콜에 따라 흡수선량율을 결정하는 과정으로 진행되었다. 전자선 에너지가 낮은 점으로 인하여 선질지표($R_{50}$)은 필름 측정법을 써서 근사적으로 결정하였다. 결과로서 단위 펄스 진동수당의 선형가속기 전자빔의 출력은 $17.0cGy/(min{\cdot}Hz$로 나타났다. 본 연구의 결과는 개발 중인 전자가속기의 성능 평가 자료로 활용될 것이다.

Abstract ▼ AI-Helper

The C-band compact linear accelerator (linac) is being developed at Dongnam Institute of radiological & Medical Sciences (DIRAMS) for medical and industrial applications. This paper was focused on the output measurement of the electron beam generated from the prototype electron linac. The dose rate was measured in unit of cGy/min per unit pulse frequency according to the IAEA TRS-398 protocol. Exradin-A10 Markus type plane parallel chamber used for the measurement was calibrated in terms of dose to water at the reference depth in water. The beam quality index ($R_{50}$) was determined by the radiochromic film with a solid water phantom approximately due to low energy electrons. As a result, the determined electron beam output was $17.0cGy/(min{\cdot}Hz$. The results were used to monitor the accelerator performance during the development procedure.

주제어

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문제 정의

The calibration factor in terms of dose to water for the Co-60 beam quality and beam quality factor was determined by applying the TRS-398 protocol. This study would be used for evaluating the linac performance during the development procedure.

제안 방법

Therefore, the code of practice in electron beam dosimetry should be extended to lower energy electron beams, although it is not suitable for the clinical purpose. The current prototype linac system would be upgraded continuously in terms of beam energy and this study would be used for evaluating the linac performance during the development.
The initial version of compact linac at DIRAMS is designed to accelerate electrons up to 4 MeV. The linac would be upgraded in many aspects including beam energy, beam focusing, automatic control of the RF and dose, and beam monitoring and diagnosis.

대상 데이터

The Markus type Exradin-A10 ionization chamber was positioned in the PTW 41023 water phantom. At the chamber position, the phantom window thickness (0.
The prototype electron linac system consists of accelerator guide, magnetron, wave guide, pulse modulator, and vacuum and cooling system. The C-band on-axis coupled standing wave technology designed by PAL (Pohang Accelerator Laboratory) was adapted to the accelerating structure.
The prototype linac was operated by the high power RF (radio frequency) generated from the magnetron. The pulsed power of several mega-watts was supplied from the pulse modulator system through the pulse transformer.

이론/모형

⁶⁾ The code of practice for reference dosimetry in clinical electron beams with energies from 3 MeV to 50 MeV was provided in the protocol. The calibration factor in terms of dose to water for the Co-60 beam quality and beam quality factor was determined by applying the TRS-398 protocol. This study would be used for evaluating the linac performance during the development procedure.

참고문헌 (9)

Robert WH: COMMERCIAL APPLICATIONS OF LINACS. Proceedings of the Linear Accelerator Conference (1990)
David IT, John BT: Back to the future: the history and development of the clinical linear accelerator. Phys Med Biol 51: R343-R362 (2006)

상세보기
IAEA TECDOC-1386: Emerging applications of radiation processing. International Atomic Energy Agency, Vienna (2004)
Danon Y, Block RC, Bahran R et al.: Nuclear Data Measurements at the RPI linac. AccApp '07: 777-780 (2007)
Mitsuru U: Review of electron linac based neutron sources for nuclear data study. CLIC Workshop (2014)
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)
Kim SH, Park BJ, Moon SI et al.: Prototype Tests on Cband Standing-wave Electron Linac. KPS spring meeting (2007)
IBA: Absolute Dose Measurements in External Beam Radiotherapy. p-Codes of Practice Absolute Dosimetry(510-001-01), IBA Dosimetry GmbH, Schwarzenbruck, Germany (2012)
TRS-277: Absorbed Dose Determination in Photon and Electron Beams: An International Code of Practice. International Atomic Energy Agency, Vienna (1997)

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