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이동연(Dong Yeon Lee),박은태(Eun Tae Park),김정훈(Jung Hoon Kim) 대한방사선과학회(구 대한방사선기술학회) 2017 방사선기술과학 Vol.40 No.2
본 연구는 방사선 차폐 시 주로 사용되고 있는 콘크리트를 대상으로 차폐 두께를 계산한 연구로서 의료용 선형가속기를 차폐하기 위해 구성되는 벽에 대한 연구이다. 선형가속기에서 발생하는 광자선 에너지 10 MV를 대상으로 MCNPX(Ver.2.5.0)를 이용하여 적절한 차폐 두께를 계산하고자 하였다. 그 결과, 광자선 차폐를 위한 십가층은 순수 콘크리트의 경우 50~100 ㎝, Boron+polyethylene 첨가 시 80~100 ㎝에서 형성되었다. 중성자 차폐는 순수콘크리트의 경우 100~140 ㎝, Boron+polyethylene 첨가 시 90~100 ㎝으로 계산되었다. 이를 바탕으로 분석하면, 콘크리트 재질은 Steel 계열을 사용하고 콘크리트에 Boron+polyethylene을 첨가하여 구성하는 것이 가장 효율적인 것으로 판단된다. The purpose of this study is to calculate the thickness of shielding for concrete which is mainly used for radiation shielding and study of the walls constructed to shield medical linear accelerator. The optimal shielding thickness was calculated using MCNPX(Ver.2.5.0) for 10 MV of photon beam energy generated by linear accelerator. As a result, the TVL for photon shielding was formed at 50~100 ㎝ for pure concrete and concrete with Boron+polyethylene at 80~100 ㎝. The neutron shielding was calculated 100~140 ㎝ for pure concrete and concrete with Boron+polyethylene at 90~100 ㎝. Based on this study, the concrete is considered to be most efficient method of using steel plates and adding Boron+polyethylene th the concrete.
소아백혈병의 전신방사선조사 시 조직보상체의 두께변화에 따른 선량평가
이동연(Dong-Yeon Lee),김창수(Chang-Soo Kim),김동현(Dong-Hyun Kim),김정훈(Jung-Hoon Kim) 한국콘텐츠학회 2014 한국콘텐츠학회논문지 Vol.14 No.4
전신방사선조사(Total Body Irradiation; TBI)는 백혈병의 치료방법 중의 하나인 조혈모세포 이식법의 전처치로 쓰인다. 2013년 장기이식관리센터 자료에 의하면 조혈모세포이식법의 건수는 계속 늘어나고 있다고 보고되었다. 하지만 현재 TBI 시행하기에 앞서 선량에 대한 평가는 미미한 실정이다. 특히 소아의 경우 방사선감수성이 민감하기 때문에 TBI 시행 전 정확한 선량평가가 시행되어야 할 것으로 판단된다. 이에 본 연구는 TBI 시행 시 사용되는 조직보상체의 두께의 변화에 따라 표면선량과 심부장기선량에 대하여 선량평가를 한 후 가장 이상적인 조건을 찾고자 하였다. 그 결과, 표면선량은 에너지 4 MV, SSD 280 ㎝, 조직보상체의 두께가 0.5 ㎝일 때 5.84 mGy/min 으로 가장 높은 수치를 나타내었다. 또한 조직보상체의 두께가 1 ㎝ 이하였을 때 TBI에서 가장 이상적인 선량분포를 나타냄을 알 수 있었다. Total body irradiation use one of the pre-treatment as hematopoietic stem cell transplantation in the treatment of leukemia. According to the study of Korean network for organ sharing 2013 report, continue to increase the number of hematopoietic stem cell transplantation. however, the current dose evaluation fall short before treatment. So purpose of this study is Surface dose and deep organ dose evaluation and then find the most ideal conditions when change of the thickness on tissue compensator in TBI. Result, surface dose in 4 MV, SSD 280 ㎝, compensators thickness 0.5 ㎝, was measured the highest dose 5.84 mGy/min. And the ideal dose showed when compensator thickness less than 1 ㎝.
이동연(Dong-Yeon Lee),권대갑(Dae-Gab Gweon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
A compact and two-dimensional atomic force microscope (AFM) using an orthogonal sample scanner, a calibrated homodyne laser interferometer and a commercial AFM head was developed for use in the nanometrology field. The x and y position of the sample with respect to the tip are acquired by using the laser interferometer in the open-loop state, when each z data point of the AFM head is taken. The sample scanner which has a motion amplifying mechanism was designed to move a sample up to 100 × 100 ㎛² in orthogonal way, which means less crosstalk between axes. Moreover, the rotational errors between axes are measured to ensure the accuracy of the calibrated AFM within the full scanning range. The conventional homodyne laser interferometer was used to measure the x and y displacements of the sample and compensated via an X-ray interferometer to reduce the nonlinearity of the optical interferometer. The repeatability of the calibrated AFM was measured to sub-nm within a few hundred nm scanning range.
몬테칼로 시뮬레이션을 이용한 소아 핵의학검사 시 인체내부 장기선량 평가
이동연(Dong-yeon Lee),강영록(Yeong-rok Kang) 대한방사선과학회(구 대한방사선기술학회) 2021 방사선기술과학 Vol.44 No.2
In this study, a physical evaluation of internal radiation exposure in children was conducted using nuclear medicine test(Renal DTPA Dynamic Study) to simulate the distribution and effects of the radiation throughout the tracer kinetics over time. Monte Carlo simulations were performed to determine the internal medical radiation exposure during the tests and to provide basic data for medical radiation exposure management. Specifically, dose variability based on changes in the tracer kinetic was simulated over time. The internal exposure to the target organ (kidney) and other surrounding organs was then quantitatively evaluated and presented. When kidney function was normal, the dose to the target organ(kidney) was approximately 0.433 mGy/mCi, and the dose to the surrounding organs was approximately 0.138–0.266 mGy/mCi. When kidney function was abnormal, the dose to the surrounding organs was 0.228–0.419 mGy/mCi. This study achieved detailed radiation dose measurements in highly sensitive pediatric patients and enabled the prediction of radiation doses according to kidney function values. The proposed method can provide useful insights for medical radiation exposure management, which is particularly important and necessary for pediatric patients.