6 MeV Electron Therapy에서의 Electron Dose Distribution에 관한 연구

제재용,박철우,진성진,박은태,Je Jae-Yong,Park Chul-Woo,Jin Sung-Jin,Park Eun-Tae 대한방사선치료학회 2005 대한방사선치료학회지 Vol.17 No.2

Purpose : Electron is used for the treatment of skin cancer, breast cancer, and head and neck cancer in clinic. Our study is performed to check the isodose distribution in source surface distance(SSD)and source bolus distance(SBD)setup, nipple influence to isodose distribution of electron, junctional area isodose variation of photon and electron field. Materials and Methods : The electron dose distribution measures the diameter for 20 cm hemisphere paraffin phantom 2 made. It inserted the film between 2 paraffin phantom and it investigated it got radiation and dose distribution curve. Results : The 8% of isodose difference is with the surface distance(SSD)and source bolus distance(SBD)setup. The electon when the nipple exists inside the field, as nipple size it cuts the bolus and when it puts out and there is a possibility of getting the dose distribution which is homogeneous. When in the junction of electron and photon it uses the bolus it uses in the electron field whole, there is a possibility of getting the dose distribution which is homogeneous. Conclusion : The dose distribution decrease from the SBD setup. To reduce the influence of nipple, corresponding volume of bolus should be removed. And bolus covering all the electron field reduced hot and cold spot of junctional area of photon. In the future becomes the research which sees an effective electron therapy.

자기장 내에서 전자선의 표면선량 변화 측정

제재용,노경석,신운재,박철우,Je, Jae-Yong,Noh, Kyung-Suk,Shin, Oon-Jae,Park, Cheol-Woo 대한방사선치료학회 2008 대한방사선치료학회지 Vol.20 No.2

Purpose: This paper describes a electron field presence of magnetic field, intensity and shape surface dose variation to clinical application possibility. Materials and Methods: The using 6 MeV electron and $10{\times}10\;cm^2$ field size, 9 hole to shielding block make the by measure the film, when the magnetic field position inside and outside of the X-Omat film and parallel plate ionization chamber using the surface dose measured. Results: Present of 4 cm to the side at angle about 3 degree from beam center, use of ring type magnetic is 0.9% increase the surface dose, lens block located in the magnetic field the surface dose 1.58% increase, half magnetic field's position on the side of them at the field center of the 3.6% increase of the surface dose. Conclusion: Surface dose variation is with magnetic field about the mean electron beam of progress direction change, orbit region patient's is inconvenient without surface dose increase percentage case goodness will be used as a useful way.

커피 찌꺼기 혼합물을 활용한 라돈 저감 효과 분석

제재용(Jae-Yong Je),김경민(Gyeong-Min Kim),김율민(Yul-Min Kim),이현우(Hyun-Woo Lee),박지우(Ji-Woo Park) 한국방사선학회 2021 한국방사선학회 논문지 Vol.15 No.6

커피는 국내뿐만 아니라 전 세계인들에게 인기 있는 음료로서 그 소비는 점점 늘어나는 추세에 있다. 커피 소비 증가는 커피를 추출하고 발생되는 커피 찌꺼기 또한 증가하고 있으며, 다양한 분야로 재활용을 시도하고 있다. 그러나 이러한 재활용 방법들은 재활용 과정들이 복잡하고 전문적인 기술을 필요로 한다. 하지만 본 연구에서는 커피 찌꺼기, 한천분말, 가루풀을 적정 비율로 배합하여 시멘트 건축마감 재료로 활용하였다. 본 재활용 방법은 제조 방법이 간단하고 시멘트벽에서 방출되는 라돈을 1회 바름으로 2.5시간, 2회 바름으로 3.9시간을 지연시켜 실내 공기질을 향상시킬 수 있는 것으로 나타났다. 또한 커피 찌꺼기 혼합물을 바른 후 건조과정에서 발생하는 균열을 매우기 위하여 2회 바름으로서 미관적인 완성도와 벽면에서 커피 찌꺼기가 탈락되는 것을 방지할 수 있는 것으로 나타났다. Coffee is a popular beverage not only in Korea but also around the world, and its consumption is on the rise. As coffee consumption increases, coffee waste are also increasing, and recycling is attempted in various fields. However, these recycling methods require complex recycling processes and specialized skills. However, in this study coffee waste, agar powder, and powdered glue were mixed in an appropriate ratio and used as a cement building finishing material. This recycling method has a simple manufacturing method and was shown to improve indoor air quality by delaying radon emitted from cement walls for 2.5 hours with one application and 3.9 hours with two applications. In addition, it was shown that after applying the coffee waste mixture, it was applied twice to close the cracks that occurred during the drying process, thereby prevent the coffee waste from falling off the wall for aesthetic perfection.

조사야 외부의 산란선량 감소 방법에 관한 연구

제재용(Jae yong Je),장호원(Ho won Jang) 한국방사선학회 2016 한국방사선학회 논문지 Vol.10 No.7

본 연구는 진단용 X선 발생장치에서 조사야 외부의 산란선량을 감소시켜 환자의 피폭 선량을 감소시키기 위한 방법이다. 자체 제작한 150 × 190 mm2 납판을 콜리메이터 하단에 부착함으로써 조사야 이외의 부위에 도달하는 산란선량을 감소시키고자 하였다. 납판을 추가로 삽입 후 X선 관축방향인 X-축의 산란선량을 측정한 결과 26 ~ 36% 감소하는 것으로 나타났으며, 관축의 수직 방향인 Y-축 방향에서는 납판의 사용유무에 따른 산란선량은 큰 변화를 나타내지 않았다. 이러한 결과는 콜리메이터 Shutter에 의해서 발생하는 산란선 보다는 초점 근방에서 발생하는 초점외 X선에 의한 산란선 영향이 크다는 것을 의미한다. 따라서 기존의 콜리메이터 하단에 추가로 납판을 설치하는 것이 조사야 외부의 X-축 산란선량을 감소시키는 방법으로 판단되어진다. In this research, The way to decrease a patient s exposure dose by reducing the scattered radiation dosage outside a radiation field with an diagnosis X-ray was examined. The scattered radiation dosage reaching other parts outside the radiation field was to be reduced by attaching a self-produced 150 × 190 mm2 lead plate to the lower part of a collimator. When a lead plate was inserted additionally and the scattered radiation dosage of the X axis was measured in the direction of the central X-ray axis, It was found out to have been decreased by 26 to 36%, and in the direction of Y axis, which was vertical direction from the central axis, The scattered radiation dosage depending on whether a lead plate was used or not displayed no large differences. These results shows that the impact of the scattered radiation by the off focus X-ray that was generated around the focus was bigger than that generated by the shutter of the collimator. Therefore it has been concluded that installing an additional lead plate in the lower part of the existing collimator can decrease the scattered radiation dosage outside a radiation field.

치료 보조기구 사용 시 후 방향 피부선량 측정

제재용(Jae-Yong Je) · 박철우(Chul-Woo Park) · 노경석(Kyung-Suk Noh) 대한방사선과학회(구 대한방사선기술학회) 2009 방사선기술과학 Vol.32 No.1

본 연구는 인체 팬텀(alderson rando phantom)의 등쪽에 원통형 전리함을 부착하여 방사선 치료 조사야 내 환자와의 접촉 물질과 조사 야의 크기, 방사선 입사각도에 따른 피부 후 방향 선량 변화를 조사하였다. 연구 결과 테니스 라켓 줄(tennis racket)의 마일러(mylar)를 기준으로 첫째 : 조사야 10×10 cm2 기준으로면(cotton)은 약 2%, breast board는 약 8%, 15×15 cm2에서는 약 6%, 20×20 cm2는 약 10% 증가하였으며,5×5 cm2에서는 약 13% 정도 감소하였다. 둘째 : 방사선 입사각도가 0°로 기준으로 하여 5°에서는 breast board 0.4%, tennis racket 0.5%, cotton 1.1%, 10°에서는 breast board 1.5%, tennis racket 1.9%, cotton 2.6%, 15°에서는 breast board 3.9%, tennis racket 2.6%, cotton 3.86% 감소하였다. 결과적으로 carbon 재질의 치료보조기구는 피부표면선량의 크게 증가하므로 치료조사야 내에서는 피부와의 접촉을 피해야 한다. The research was about the relation between the dorsal side dose measured by using the phantom body (Alderson Rando Phantom) and factors like contacted material of the patients, the size of the field, angle of incidence. Compared with mylar (tennis racket), the dose on 10×10 cm2 field size of cotton was increased by 2% and by 8% in the case of breast board. In the case of 15×15 cm2 field size, the dose was increased by 6% compared with 10×10 cm2 size. The field size of 20×20 cm2 resulted in 10% increase of dose, while 5×5 cm2 produced 13% decrease. Compared with incident angle 0°, the cases for the incident angle 5° had 0.4% less dose for breast board, 0.5% for tennis racket, 1.1% for cotton. The cases for the incident angle 10° had 1.5% less dose for breast board, 1.9% for tennis racket, 2.6% for cotton. For the incident angle 15°, breast board, tennis racket, cotton caused decrease of dose by 3.9%, 2.6%, 3.86% respectively. Resultantly carbon material can cause more skin dose in treatment field. By the results of this study, we recommend that one should avoid the contact between the carbon material and skin.

KCl:Eu 단결정 성장과 형광특성

제재용 ( Jae Yong Je ),장경혁 ( Kyoung Hyuk Jang ),박철우 ( Chul Woo Park ) 한국센서학회 2011 센서학회지 Vol.20 No.1

Single crystal of KCl doped with Eu2+ ions was grown by the Czochralski method in the high pressure Ar gas(purity 99.999 %) atmosphere with chamber pressure from which the crystal with high quality was obtained. As grown KCl:Eu2+ crystal was checked by X-ray diffraction. Luminescence properties of KCl:Eu are investigated by laser-excitation spectroscopy under 355 nm excitation at 14 and 295 K. The broad emission band due to the Eu2+ 5d→4f transition is peaked at 417 nm with full width at half maximum of about 20 and 30 nm.

감마 분광 분석기의 측정 용기와 배경 준위의 영향

장경혁(Jang Kyoung Hyuk),제재용(Jae Yong Je) 한국방사선학회 2015 한국방사선학회 학술대회 논문집 Vol.2015 No.추계

본 연구는 감마 분광 분석기를 이용하여 환경 준위를 측정할 때 사용되는 측정 용기가 배경 준위에 어떠한 영향을 주는 지 평가하고자 한다. 측정 대상은 측정 용기 없이 감마 핵종을 분석한 값과 2000 mL의 마리넬리(Marinelli) 비이커를 감마 핵종을 분석하고 검출되는 핵종 중에 자연방사성 핵종인 40-포타슘에 대한 영향을 평가하였다. 반복 측정 결과 용기에 대한 배경 준위의 영향은 불확실도 내에서 동일하였으며 측정 용기에 따른 40-포타슘의 농도는 별다른 차이를 보이지 않았다. 따라서 감마 분광 분석용의 측정 용기에 따른 배경 준위를 개별로 측정하는 것은 필요하지 않을 것으로 판단된다. This study using the gamma spectroscopy measured by environment level container influence in the background level. Marinelli beaker evaluation of the 40k nuclide. No significant differences in the results of 40K measurements. Therefore, measuring the background level of individual measurement according to container is not necessary.

자외선과 X-선을 조사한 콩나물 평가

차현호(Hyeon Ho Cha),제재용(Jae Yong Je) 한국방사선학회 2015 한국방사선학회 학술대회 논문집 Vol.2015 No.춘계

본 연구는 콩나물 콩에 방사선과 자외선을 조사하여 콩나물로 성장하는 발육상태를 비교 분석 하였다. 비교분석을 위하여 10일 동안 자외선과 X-선을 조사하여 뿌리의 길이를 측정하여 발육 특성을 평가하였다. X-선을 조사한 콩나물의 발육상태가 가장 우수하며, 암실에서 키운 콩나물의 발육상태가 가장 낮은 것으로 나타났다. 하지만 자외선 조상 의한 콩나물의 발육과 성장은 읿반적인 콩나물 성장보다는 빠르지만 푸른색을 나타내어 콩나물로서의 품질에 부정적인 경향을 나타내었다. 즉, 저 선량, 저에너지의 X-선 조사는 콩나물의 발육과 성장을 촉진하는 것으로 나타나 콩나물의 조기 성장을 위한 자료로 활용되어질 것으로 판단되어진다. In this study, X-ray and ultraviolet were applied to beans with sprouts, and their conditions of growth into sprouts were compared and analyzed. For the comparison and analysis, ultraviolet and X-ray were irradiated for ten days, and then the growth features of the beans were assessed by measuring the lengths of their roots. It was found out that the bean sprouts to which X-ray was applied had the best condition of growth, and those grown in a dark room had the worst condition. On the other hand, the bean sprouts to which ultraviolet were applied were proved to grow faster than normal ones, but their colors were bluish, so they had a negative tendency for the quality as bean sprouts. In other words, the low dose radiation and lower energy was proved to stimulate bean sprouts growth, so it's expected to be used as the data for fast growth of bean sprouts.

근적외선을 여기광으로 하는 Yb, Tm이 도핑된 LaGaO3 형광체의 업컨버젼 형광 특성

주정식(Jung Sik Joo),양현경(Hyun Kyoung Yang),제재용(Jae Yong Je) 한국방사선학회 2015 한국방사선학회 학술대회 논문집 Vol.2015 No.추계

LaGaO3:Tm3+, Yb3+분말은 Yb3+의 함량(0∼0.15 mol)을 변화시겨 고상반응법으로 합성하였다. X-선 회절(XRD), 에너지분석법(EDS)을 통해 결정구조 및 화학적 특성을 각각 분석하였다. 형광특성을 분석하였으며, 형광스펙트럼을 통하여 Tm3+의 f12 전자 궤도에서 발생하는 1G4-3H6 전이와 약한 1G4-3F4 전이 그리고 강한 3H4-3H6 전이와 함께 Yb3+에 의한 2F5/2-2F7/2 전이가 일어남을 확인하였다. LaGaO3:Tm3+,Yb3+ 분말의 업컨버젼 형광특성은 975 nm의 여기 파장을 가지는 레이저 다이오드를 사용하여 측정하였다. 합성한 시료에서 업컨버젼 형광 스펙트럼이 발생함을 확인하고 스펙트럼을 분석하였다. 또한, 본 시편에 대한 업컨버젼 형광의 원리를 제안하였다. We synthesized A LaGaO3:Tm3+, Yb3+ powder with different Yb3+ contents (0∼0.15 mol) using of a conventional solid-state reaction. The structure, morphology and chemical analysis of the as-prepared phosphors were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) techniques, respectively. The study was the photoluminescence properties of the as-prepared powder samples. The spectrum consisted of 1G4-3H6, weak 1G4-3F4, and intense 3H4-3H6 transition bands within the f12 configuration of Tm3+, together with the 2F5/2-2F7/2 transition of Yb3+. Up-converted emission of LaGaO3:Tm3+, Yb3+ powders was observed under laser diode excitation of 975 nm. We observed obvious differences in up-converted emission spectra among the as-obtained products, and possible reasons were discussed. we also proposed The corresponding up-conversion mechanism.

선속평탄 여과판 사용 유무에 따른 산란선 측정

최유진(You Jin Choi),전성진(Seong Jin Jin),제재용(Jae Yong Je) 한국방사선학회 2014 한국방사선학회 학술대회 논문집 Vol.2014 No.추계

본 연구는 성형가속기를 이용한 방사선 조사에서 선속평탄 여과판 사용 유무에 따른 산란선을 측정하고자 한다. 산란선 측정은 전리함을 사용하였으며, 조사한 방사선의 에너지는 6 MV와 10 MV 이다. 겐트리 회전 중심에서 전리함을 15, 25, 35 ,45 cm 거리에 위치시키고 선속평탄 여과판 사용 유무와 거리에 따른 산란선을 측정하였다. 각각의 에너지에 대하여 100 cGy 조사한 결과 6 MV에서 선속평탄 여과판을 사용하지 않은 것에서 65% 정도로 낮게 발생되었고, 10 MV 에서는 55% 정도로 낮게 발생되었다. 즉, 방사선 치료에서 결정 장기 주변의 방사선 치료에서 선속평탄 여과판을 사용하지 않을 떄 산란선이 적게 발생되고 방사선에 대한 확률적인 영향을 줄이기 위한 유용한 방법으로 판단되어진다. This Study aims at measuring scattered rays depending on the use of a flattening filter when radiation is irradiated using a linear accelerator. measurement of the scattered rays, an ionization chamber was used, and the energy of the irradiated radiation was 6 MV and 10 MV. The ionization chamber was located at the spot 15cm, 25cm, 35cm and 45cm far away from the center of gantry rotation, and the scattered rays were measured according to whether a flattening filter was used or not and to the distance. As the result of investigation of 100 cGy about each energy, when the flattening filter was not used with 6 MV, it occurred at a low level of 65%, and with 10 MV at that of 55%. In other words, it's been concluded that when a flattening filter is not used for radiation treatment of the parts around the critical organ, scattered rays generate in a small quantity, and it's a useful way to decrease the stochastic effect of radiation.