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Practical Biological Spread-out Bragg Peak Design for a Carbon Beam
김창혁,이화련,장세덕,장홍석,김정환,박동욱,황원택,양태근 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.8
In radiation therapy, the carbon beams has more advantages with respect to biological properties then a proton beam. The carbon beam has a high linear energy transfer (LET) to the medium and a higher relative biological effectiveness (RBE). To design the spread-out Bragg peak (SOBP) of biological dose for a carbon beam, we propose a practical method using the linear-quadratic (LQ) model and the Geant4-based Monte Carlo simulation code. Various Bragg peak profiles and LETs were calculated for each slice in the target region. To generate an appropriate biological SOBP, we applied a set of weighting factors, which are power functions in terms of energy steps, to each obtained physical dose. The designed biological SOBP showed a uniformity of 1.34%.
김창혁,이화련,장세덕,김현영,한가람,김정환,장홍석,박동욱,황원택,양태건 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.3
The active scanning technique is a pencil beam delivery method in particle therapy. The active scanning beam delivery system consists of a beam scanner, beam monitor, energy modulator, and related programs, such as the irradiation control and planning programs. A proposed prototype active scanning system was designed and installed on MC-50 at the Korea Institute of Radiological and Medical Science (KIRAMS) with a 45-MeV proton beam. The laminated magnetic yoke of the scanning magnet supported fast ramping. The beam intensity and the beam profile monitors were designed for measuring the beam’s properties. Both the range shifter and the ridge filter modulate the incoming beam energy. The LabVIEWr-based beam-irradiation-control program operates the system in a sequential operation manner for use with the MC-50 cyclotron. In addition, an in-housecoded irradiation-planning program generates an optimal irradiation path. A scanning experiment was successfully completed to print the logo of the Korea Heavy Ion Medical Accelerator (KHIMA) on GaF film. Moreover, the beam’s position accuracy was measured as 0.62 mm in the x-direction and as 0.83 mm in the y-direction.
고무차륜 트램을 위한 자기장을 이용한 자율주행시스템 개발
목재균(MOK JaiKyun),장세기(CHANG SeKy),정우성(JUNG WooSung),표명덕(PYO MyungDug) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper shows how can be controlled the rubber tired TRAM by electromagnetic field with a specific pattern as autonomous driving system. The system is composed with drive elements, steering elements, navigational devices, transmitter/receivers and sensor means for sensing the position relative to the magnetic markers. There are difficulties in sensing track conditions, curvatures, slops etc, forward compared to that of the control system optically. The sensing track conditions previously is important for running stability and riding comfort. This paper shows how can achieve track condition in advance by means of electromagnetic pattern originally.
김정국(Kim Jeongguk),정종덕(Chung Jong-Duk),편장식(Pyun Jang-Sik),장세기(Chang Se-Ky),홍용기(Hong Yong-Ki),김원경(Kim Weon-Kyung) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Deterioration analysis was performed on carbody and bogies of a shunting locomotive, which has been used for shunting works in steel making processes. In this investigation, various types of technical evaluation methods for the locomotive were employed to assess the current deterioration status. Corrosion test and nondestructive evaluation (NDE) techniques were employed to demonstrate the wear status of the carbody and bogie parts in the locomotive. Since the locomotive has been working under corrosive environment, the corrosion tests with x-ray analysis for exterior part of the locomotive were conducted to examine the evolution of corrosion reaction, and NDE techniques such as ultrasonic testing, magnetic particle testing, and x-ray radiography, were conducted on the carbody and bogies to inspect any possible inherent and/or in-service flaws. In this paper, the degree of deterioration in a shunting locomotive has been presented based on the analysis results.
14.6 A GeV ^28Si 중이온이 원자핵건판내에서 발생시킨 핵반응에서 생성된 2차입자의 발생각 분포
김종오,김태연,남신우,신택수,우종관,이세병,임계엽,장세덕,조재희,천병구,임인택,김기영 慶尙大學校 기초과학연구소 1990 基礎科學硏究所報 Vol.6 No.-
14.6A GeV^28Si 중이온이 원자핵 건판내에서 발생시킨 N_h=1인 핵반응에서 생성된 47개의 파쇄 α 입자와 537개의 단일하전 2차입자의 발생각들을 측정하여 변수 exp(γ-η_b)의 포괄적 분포를 회귀함수 dN=exp[a+χ{exp(γ-η_b)d{exp(γ-η_b)}로 적합시켰다. 여기서 의사신속도 γ=arctanh(cosθ)=-ln tan(θ/2)이고, 입사 중이온의 신속도 η_b=3.445이다. 그 적합결과 파쇄 α입자의 경우 χ=-0.052±0.011이고, 파쇄 p입자의 경우 χ=-0.141±0.015이었다. For LS emission angles of 47 α fragments and 537 single-charged shower particles, produced by the N_h (the number of heavyprongs)=1 interactions of 14.6 A GeV^28Si nuclei in the nuclear emulsion, the distribution of the parameter exp(γ-η_b) is well expressed by dN=exp[a+χ{exp(γ-η_b)d{exp(γ-η_b)}with χ=-0.052±0.011 for αfragments and χ=-0.141±0.015 for p 'fragments', where the pseudorapidity of secondaries γ=arctanh(cosθ)=-ln tan(θ/2) and the rapidity of incident heavy ions, η_b=3.445.
Development of a Control System for the 14.5 GHz ECR Ion Source
김정환,황원택,박동욱,Hong-Suk Chang,양태건,Kun-Uk Kang,장세덕,김창혁,이화련,김현용,김근범 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.7
A control system of the 14.5 GHz electron cyclotron resonance (ECR) ion source has been designedand developed in KHIMA(Korea Heavy Ion Medical Accelerator) project which will use C6+ions for heavy ion therapy. Production of the selected ion beam in stable operation with safetyis a development goal with flexibility by easy access and modification which are necessary duringdevelopment process with an accelerator. The control system of the ECR ion source systemconsists of electric control cabinet (ECC) as hardware and main control program (MCP) as software,respectively. ECC developed to manage power and control flow with electric components andcontrollers controls the injection system, RF system, high voltage & extraction system, analyzingsystem, vacuum system, cooling system, diagnosis system and safety system. MCP is the supervisoryprogram developed for effective automation and data acquisition by LabVIEW-based graphicalprogramming. The isolated network from a control computer to ECC and bleeder resistors in a steelplate box composed by the simulation result for high voltage power supplies increase reliability andsafety. The performance of the developed control system has been verified successfully by beamextraction of C4+ ion from CO2 as main gas and He as support gas through an analyzing magnetand a faraday cup with the acquired spectrum at the control system. After optimization with C4+ions, measurement of characteristics of C6+ ions including emittance of the ion beam will be plannedearly 2013. Also, quantity of C6+ ions in the same charge to mass ratio will be estimated by using13CO2 as main gas and He as support gas.