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방사선 치료 시 산란선 및 누설선에 의한 표면선량 분포에 관한 연구
강종수 ( Jongsu Kang ),정동경 ( Dongkyung Jung ),김용민 ( Yongmin Kim ) 한국방사선학회 2018 한국방사선학회 논문지 Vol.12 No.3
방사선 치료 시 환자는 부득이하게 산란선과 누설선에 의한 2차 방사선 피폭을 받게 된다. 진단용 방사선의 경우 진단참조준위로 환자의 피폭을 줄이기 위한 가이드라인을 제시하고 있지만 치료용 방사선의 경우 2차 방사선에 의한 피폭선량이 상당함에도 불구하고 상한치 설정 시 치료 효과의 저감을 이유로 선량을 제한하지 않고 있다. 이에 본 연구는 선형가속기를 이용한 방사선 치료 시 원거리 조직에서 환자가 받을 수 있는 2차 방사선을 형광유리선량계로 측정하였으며 형광유리선량계의 빌드업 특성에 따른 형광량의 포화도를 측정하였다. 연구 결과 조사야 경계로부터 거리가 멀어질수록 피폭선량은 급격히 줄어들었으며, 두부 1 Gy 조사 시 경부 18.45 mGy, 경부 1 Gy 조사 시 두부 15.55 mGy, 흉부 1 Gy 조사 시 경부 14.26 mGy, 골반 1 Gy 조사 시 흉부 1.14 mGy로 피폭되었다. 형광량의 포화도는 판독시점에 따라 1.8 ~ 4.8% 정도 과대평가 될 수 있음을 확인하였다. During radiation therapy, the patient is exposed to secondary radiation by scattered and leakage radiation. For the diagnostic radiation, guidelines for reducing the patient's exposure as the diagnostic reference level are provided. However, in the case of therapeutic radiation, even though the radiation dose by the secondary radiation is considerable, the prescription dose is not limited because of the reason of the therapeutic efficiency. The purpose of this study was to evaluate the secondary radiation that the patient could be received at the peripheral tissue during the radiotherapy using the linear accelerator with the radiophotoluminescent glass dosimeter. In addition, we measured the degree of saturation of the luminescent amount according to the build-up characteristic of the radiophotoluminescent glass dosimeter. As a result of carrying out this study, the exposure dose decreased drastically farther away from the treatment field. When the head was irradiated with 1 Gy, the neck could be exposed to 18.45 mGy. When the same dose was irradiated at the neck, 15.55 mGy of the head and irradiated at the chest, 14.26 mGy of the neck and irradiated at the pelvis, 1.14 mGy of the chest were exposed separately. The degree of saturation of the luminescent intensity could be overestimated by 1.8 ~ 4.8% depending on time interval for 3 days.
A Study on the Surface Dose Distribution by Scattered and Leakage Radiation in Radiation Therapy
Jongsu Kang(강종수),Dongkyung Jung(정동경),Yongmin Kim(김용민) 한국방사선학회 2018 한국방사선학회 논문지 Vol.12 No.3
During radiation therapy, the patient is exposed to secondary radiation by scattered and leakage radiation. For the diagnostic radiation, guidelines for reducing the patient s exposure as the diagnostic reference level are provided. However, in the case of therapeutic radiation, even though the radiation dose by the secondary radiation is considerable, the prescription dose is not limited because of the reason of the therapeutic efficiency. The purpose of this study was to evaluate the secondary radiation that the patient could be received at the peripheral tissue during the radiotherapy using the linear accelerator with the radiophotoluminescent glass dosimeter. In addition, we measured the degree of saturation of the luminescent amount according to the build-up characteristic of the radiophotoluminescent glass dosimeter. As a result of carrying out this study, the exposure dose decreased drastically farther away from the treatment field. When the head was irradiated with 1 Gy, the neck could be exposed to 18.45 mGy. When the same dose was irradiated at the neck, 15.55 mGy of the head and irradiated at the chest, 14.26 mGy of the neck and irradiated at the pelvis, 1.14 mGy of the chest were exposed separately. The degree of saturation of the luminescent intensity could be overestimated by 1.8 ~ 4.8% depending on time interval for 3 days. 방사선 치료 시 환자는 부득이하게 산란선과 누설선에 의한 2차 방사선 피폭을 받게 된다. 진단용 방사선의 경우 진단참조준위로 환자의 피폭을 줄이기 위한 가이드라인을 제시하고 있지만 치료용 방사선의 경우 2차 방사선에 의한 피폭선량이 상당함에도 불구하고 상한치 설정 시 치료 효과의 저감을 이유로 선량을 제한하지 않고 있다. 이에 본 연구는 선형가속기를 이용한 방사선 치료 시 원거리 조직에서 환자가 받을 수 있는 2차 방사선을 형광유리선량계로 측정하였으며 형광유리선량계의 빌드업 특성에 따른 형광량의 포화도를 측정하였다. 연구 결과 조사야 경계로부터 거리가 멀어질수록 피폭선량은 급격히 줄어들었으며, 두부 1Gy 조사 시 경부 18.45mGy, 경부 1Gy 조사 시 두부 15.55 mGy, 흉부 1Gy 조사 시 경부 14.26mGy, 골반 1Gy 조사 시 흉부 1.14mGy로 피폭되었다. 형광량의 포화도는 판독시점에 따라 1.8 ~4.8% 정도 과대평가 될 수 있음을 확인하였다.
모듈 내구시험시 Wheel Adapter의 중량 영향성 평가
강종수(Jongsu Kang),김기훈(Gihoon Kim),강우종(Woojong Kang),김대성(Daeseung Kim),이상헌(Sangheon Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The suspension systems of module unit are being evaluated to raise durability performance reliability on these days. Driving tests were carried out in the PG of KATECH after many sensors were attached in the vehicle. As driving tests result, wheel load, strain of suspension parts and car acceleration data were measured. The acquired data was used to make a driving signal of half road simulator by iteration process. Instead of wheel force transducer(WFT), only dummy wheel adapter has been installed to execute durability test generally. This results the inertia difference from the weight difference. Durability test was executed after additional dummy wheel adapter was installed to compensate this phenomenon. A comparison of strain history, frequency and local strain rate was made between the only dummy wheel adapter installation condition and additional dummy wheel adapter installation condition. As result, the mass effect of dummy wheel adapter was analyzed. And spring displacement and velocity were also analyzed to comprehend vertical behavior characteristic of suspension system on the only dummy wheel adapter installation condition over against additional dummy wheel adapter installation condition.