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Geant4를 활용한 국제우주정거장 내의 조직등가비례계수기 모의 실험
표정현,이재진,남욱원,김성환,김현옥,임창휘,박귀종,이대희,박영식,문명국,Pyo, Jeong-Hyun,Lee, Jae-Jin,Nam, Uk-Won,Kim, Sung-Hwan,Kim, Hyun-Ok,Lim, Chang-Hwy,Park, Kwi-Jong,Lee, Dae-Hee,Park, Young-Sik,Moon, Myung-Kook 한국천문학회 2012 天文學論叢 Vol.27 No.3
The International Space Station (ISS) orbits the Earth within the inner radiation belt, where high-energy protons are produced by collisions of cosmic rays to the upper atmosphere. About 6 astronauts stay in the ISS for a long period, and it should be important to monitor and assess the radiation environment in the ISS. The tissue equivalent proportional counter (TEPC) is an instrument to measure the impact of radiation on the human tissue. KASI is developing a TEPC as a candidate payload of the ISS. Before the detailed design of the TEPC, we performed simulations to test whether our conceptual design of the TEPC will work propertly in the ISS and to predict its performance. The simulations estimated that the TEPC will measure the dose equivalent of about 1:1 mSv during a day in the ISS, which is consistent with previous measurements.
마이크로 도시메트리용 다분할 조직등가비례계수기의 개발과 특성 평가
남욱원 ( Uk Won Nam ),박원기 ( Won Kee Park ),이재진 ( Jae Jin Lee ),표정현 ( Jeong Hyun Pyo ),문봉곤 ( Bong Kon Moon ),문명국 ( Myung Kook Moon ),임창휘 ( Chang Hwy Lim ),이수현 ( Su Hyun Lee ),김성환 ( Sung Hwan Kim ) 한국센서학회 2015 센서학회지 Vol.24 No.2
We designed, developed and characterized a multi-segmented tissue equivalent proportional (TEPC) counter for microdosimetry. The energy resolution of the multi-segmented TEPC was about 12% for 241Am 5.45 MeV alpha particles. The resolution was better than 33% for a single un-segmented TEPC. A compact and low power consumption TEPC could be made by using digital pulse processor (DPP). We also successfully calibrated the TEPC by using 252Cf standard neutron source in Korea Research Institute of Standards and Science (KRISS). According to the results, the TEPC is useful for several application of radiation monitoring such as a neutron monitor, air crew monitor and space dosimeter.
프로토 타입 조직등가비례계수기의 중입자가속기연구소의 135 MeV/u 탄소 이온에 대한 선형에너지 스펙트럼 측정
남욱원 ( Uk Won Nam ),이재진 ( Jae Jin Lee ),표정현 ( Jeong Hyun Pyo ),박원기 ( Won Kee Park ),문봉곤 ( Bong Kon Moon ),임창휘 ( Chang Hwy Lim2,),문명국 ( Myung Kook Moon ),하시시키다무라 ( Hisashi Kitamure ),신고고바야시 ( Shingo Kob 한국센서학회 2014 센서학회지 Vol.23 No.3
TEPC (Tissue Equivalent Proportional Counter) was usually used for high LET radiation dosimetry. We developed a prototype TEPC for micro-dosimetry in the range of 0.2~300 keV/μm. And, the simulated site diameter of the TEPC is 2 μm, of similar size to a cell nucleus. For purposes of characterization the response for high LET radiation of the TEPC has been investigated under 135MeV/u Carbon ions in HIMAC (Heavy Ion Medical Accelerator). We determined the gas multiplication factor and measured the lineal energy spectrum [yd(y)] of 135 MeV/u Carbon ions. The value of the gas multiplication factor was 315 at 700 V bias voltage. As a result of the experiment, we could more understand the performance of the TEPC for high LET (Linear Energy Transfer) radiation. And the procedure of high LET radiation dosimetry using TEPC is established.
박귀종,문봉곤,박성준,박영식,이대희,이창희,나자경,정웅섭,표정현,이덕행,남욱원,이승우,양순철,한원용,Park, Kwi-Jong,Moon, Bong-Kon,Park, Sung-Jun,Park, Young-Sik,Lee, Dae-Hee,Ree, Chang-Hee,Nah, Jak-Young,Jeong, Woog-Seob,Pyo, Jeong-Hyun,Lee, Du 한국광학회 2011 한국광학회지 Vol.22 No.6
한국천문연구원이 개발한 다목적적외선영상시스템(Multi-purpose IR Imaging System, MIRIS)은 과학기술위성 3호(STSAT-3)의 주탑재체이다. 지구관측카메라(Earth Observation Camera, EOC)는 MIRIS를 구성하는 두 개의 적외선 카메라 중에 하나로, 지구의 $3{\sim}5{\mu}m$ 파장대의 적외선을 관측하기 위한 카메라이다. EOC의 광학계는 카세그레인 방식으로써 구경이 100 mm이고, 주경과 부경은 모두 비구면 반사경이다. EOC 주경의 플렉서는 링 타입으로써 발사환경에서 주경이 겪을 수 있는 충격과 진동을 견디도록 예압을 가하며 주경을 지지한다. 이는 마치 리테이너로 렌즈를 지지하는 것과 같은 메커니즘으로 주경을 지지하기 위한 시도이다. 광기계 해석을 통해 EOC 주경이 효과적으로 지지되고 있음을 확인했다. MIRIS(Multi-purpose Infra-Red Imaging System) is the main payload of the STSAT-3(Korea Science and Technology Satellite. 3), which is being developed by KASI(Korea Astronomy & Space Institute). EOC(Earth Observation Camera), which is one of two infrared cameras in MIRIS, is the camera for observing infrared rays from the Earth in the range of $3{\sim}5{\mu}m$. The optical system of the EOC is a Cassegrain prescription with aspheric primary and secondary mirrors, and its aperture is 100mm. A ring type flexure supports the EOC primary mirror with pre-loading in order to withstand expected load due to the shock and vibration from the launcher. Here we attempt to use the same mechanism by which a retainer supports the lens. Through opto-mechanical analysis it was confirmed that the EOC primary mirror is effectively supported.
400 MeV/u 탄소 이온에 대한 방사선치료 선량 측정용 고체비적검출기의 교정
김성환(Sung hwan Kim),남욱원(Uk Won Nam),이재진(Jae jin Lee),박원기(Won Kee Park),표정현(Jeong hyun Pyo),문봉곤(Bong Kon Moon) 대한방사선과학회(구 대한방사선기술학회) 2016 방사선기술과학 Vol.39 No.1
본 연구에서는 탄소이온을 이용한 고LET 방사선 치료시 CR-39 고체비적검출기(SSNTD)를 선량계로 사용하기 위하여 일본 중입자가속기연구소(HIMAC)의 400 MeV/u 탄소 이온을 이용한 교정실험을 수행하였다. 탄소 이온을 조사한 CR-39 검출기는 일본 우주항공연구개발기구(JAXA)의 고체비적검출기 전처리 프로토콜에 따라 화학적 에칭을 하였고, 에칭된 CR-39 검출기의 표면에 형성된 트랙은 디지털 카메라로 촬영한 후 Image J를 이용하여 분석하였다. 분석결과 400 MeV/u 탄소 이온의 yF와 yD는 각각 8.5 keV/μm 및 10.1 keV/μm이었으며, 이 결과는 한국천문연구원의 조직등가비례계수기(TEPC)로 측정한 값 및 GEANT4 몬테칼로 시뮬레이션으로 계산한 값과 잘 일치하였다. 본 연구를 통하여 CR-39의 선량 및 LET 교정인자를 결정할 수 있었으며, 고LET 방사선 치료시 CR-39를 이용한 선량평가의 가능성을 확인하였다. In this study, equivalent dose and LET (Linear Energy Transfer) calibration of CR-39 SSNTD (Solid State Nuclear Track Detector) were performed using 400 MeV/u C heavy ions in HIMAC (Heavy Ion Medical Accelerator in Chiba) for high LET radiation therapy. The irradiated CR-39 SSNDTs were etched according the etching condition of JAXA (Japan Aerospace Exploration Agency). And the etched SSNTDs were analyzed by using Image J. Determined frequency mean dose ( yD )and dose-mean lineal energy ( yF )of 400 MeV/u C are about 8.5keV/mm and 10.1 keV/mm, respectively by using the CR-39 SSNTD. This value is very similar to the results calculated by GEANT4 Monte Carlo simulation and measured with TEPC (Tissue Equivalent Proportional Counter) active radiation detector. We could determine the equivalent dose and LET calibration factors of CR-39. And we confirmed that the CR-39 SSNTD was useful for high LET radiation dosimetry in hadron radiotherapy.