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문봉곤,김용하,이유,김준,MOON BONG-KON,KIM YONG HA,YI YU,KIM JHOON 한국천문학회 2001 Journal of The Korean Astronomical Society Vol.34 No.1
For the planned experiments of Korea Sounding Rocket-III (KSR-III), we have constructed a model of MUV dayglow in the mid-latitude. The model computes relative intensities of individual emission lines in the Vegard-Kaplan and 2PG band systems of $N_2$ in the wavelength range of 2500-3500${\AA}$. In addition to the emission lines, solar scattered continuum was computed by an extended LOWTRAN7 code, in which we have included solar scattering in altitudes higher than 100 km by using MSIS90 thermosphere model. Ratios among vibrational bands of VK and 2PG system, were computed from the observed MUV dayglow spectra of Cleary et al. (1995). The model provides MUV dayglow intensitiy profiles with a wavelength resolution of 3.13${\AA}$ as a function of altitude. The computed intensity profiles have been utilized in designing the KSR-III airglow photometers.
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.
목승원,이성호,육인수,박영식,진호,한정열,문봉곤,차상목,김건희,임명신,Mok, Seung-Won,Lee, Sung-Ho,Yuk, In-Soo,Park, Young-Sik,Jin, Ho,Han, Jeong-Yeo,Moon, Bong-Kon,Cha, Sang-Mok,Kim, Geon-Hee,Im, Myung-Shin 한국천문학회 2006 天文學論叢 Vol.21 No.2
The KASINICS (KASI Near Infrared Camera System) is a ground-based Near-Infrared (NIR) imaging instrument developed by the Korea Astronomy and Space Science Institute (KASI). In this paper, we report the test results of the KASINICS camera optics system which is comprised of a 1-1 Offner relay. We measure that the surface RMS fluctuations of the Offner mirrors are at the level of $10^{-1}-10^{-2}$ of the target wavelengths, showing that the mirrors are sufficiently smooth for NIR observations. The alignment of the Offner optics system has been checked too. Our ray-tracing simulations find that the image quality should not degrade more than the pixel size of the KASINICS ($40{\mu}m$), if a de-centering or a tilt of the Offner mirrors are within 5mm, or $2.5^{\circ}$. Our measurement shows that the de-centering or the tilt of the Offner mirrors are less than 1 mm or $0.5^{\circ}$, assuring that the KASINICS image quality are not affected by the alignment errors. We have also measured that the optics resolution is $20{\mu}m$ and it does not degrade more than 10% over the detector surface area of 14.3 mm ${/times}$ 14.3mm. Overall, we conclude that the KASINICS optics system satisfies the design requirements for NIR imaging observations.
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.
우주방사선측정용 조직등가비례계수관의 교정과 의료분야에서의 응용
김성환(Kim Sunghwan),남욱원(Nam Uk-Won),이재진(Lee Jaejin),표정현(Pyo Jeonghyun),박원기(Park Won-Kee),문봉곤(Moon Bong-Kon),김현수(Yeonsu Kim),백금문(Geum Mun Baek) 한국방사선학회 2014 한국방사선학회 학술대회 논문집 Vol.2014 No.추계
조직등가비례계수기는 우주에서의 복잡한 방사선 환경에서 방사선의 선에너지전이 스펙트럼을 측정하여 등가선량을 측정할 수 있는 검출기이다. 본 연구에서는 국제우주정거장에서 방사선량 모니터링에 활용할 수 있은 조직등가비례계수기를 개발하고 그 특성을 평가하였다. 소형 디지털화된 조직등가비례계수기는 미소선량측정을 위하여 직경 2 μm 크기의 선량을 모사하도록 설계 제작하였다. 개발된 검출기는 한국표준연구원의 252Cf 중성자 표준선원으로 교정하였으며, 채널- 선에너지전이 교정계수는 0.2 keV/μm-CH 이었다 Tissue equivalent proportional counter (TEPC) can measure the LET spectrum and calculate the equivalent dose for the complicated radiation field in space. In this paper, we developed and characterized a TEPC for radiation monitoring in International Space Station (ISS). The compact digital type TEPC which can simulate a 2 μm of the site diameter for micro-dosimetry has been tested with 252Cf neutron standard source in KRISS. The determined calibration factor of channel-LET was about 0.2 keV/μm-CH.
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.
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.