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Dose Distribution in Solid Phantom by TLD with a Metal Plate of Various Thicknesses
Kim, Sookil Korean Society of Medical Physics 1999 의학물리 Vol.10 No.2
Purpose: TLD experiments were set up to measure the dose distribution and to analyze the influence on dose measurement of thin metal plate and solid water phantom. The aim of the present study was to investigate the build-up effect of metal plate loaded on TLD chip and depth dose in the controlled environment of phantom measurements. Materials and Methods: Measurements were done by using LiF TLD-100 loaded by a thin metal plate with the same surface area (3.2$\times$3.2 $\textrm{mm}^2$) as TLD chip. TLD chips loaded with one metal plate from three different metal plate (Tin, Copper, Gold) of different thicknesses (0.1, 0.15, 0.2, 0.3 mm) were used respectively to measure radiation dose. Using the TLD loaded with one metal plate, surface dose and the depth dose at the build-up maximum region were investigated. Results: Using a metal plate on TLD chip increased the surface dose. Surface dose curve shows the dose build-up against equivalent thickness of metal to water. The values of TL reading obtained by using metal plate at depth of build-up maximum are about 8% to 13% lower than those obtained by normal TLD chip. Conclusion: The metal technique used for TLD dosimetry could provide clinicals information about the build-up of dose up to 4.2mm depth in addition to a depth dose distribution. The results of TLD with a metal plate measurements may help with decisions to boost or bolus certain areas of the skin. 목적 : 금속박막과 고체 팬텀이 선량 분포와 선량 측정에 미치는 영향을 연구하기 위하여 TLD 실험을 행하였다. 본 연구의 목적은 주어진 고체 팬텀 환경 내에서 TLD 기판 위에 놓인 금속박막의 build-up 효과와 깊이선량 분포를 알아보고자 하였다. 대상 및 방법 : 측정은 TLD 기판과 같은 면적 (3.2 $\times$ 3.2 $\textrm{mm}^2$)의 금속박막을 LiF TLD-100 위에 얹어서 행하였다. 여러 종류 (주석, 구리, 금) 의 다양한 두께 (0.1, 0.15, 0.2, 0.3 mm)를 가진 금속박막 중에 한 개를 TLD 기판 위에는 얹어서 각 각의 흡수선량을 측정하였다. 금속박막을 얹은 TLD 기판을 사용하여 고체 팬텀에서의 표면홉수선량과 최대 build-up 영역에서 흡수선량을 측정하였다. 결과 : 금속박막을 이용한 TLD 기판의 경우 표면흡수선량이 증가하였고, 물에 대한 금속의 등가 두께에 따른 표면흡수선량 곡선에는 build-up 이 뚜렷이 관측되었다. 최대 build-up 영역에서 관측한 흡수선량 측정값은 금속박막을 없지 않은 TLD의 경우보다 약 8% 에서 13% 정도의 보다 작은 값을 나타내었다. 결론 : TLD 선량 측정 시 금속 박막 법은 깊이에 따른 흡수선량 뿐 만 아니라 피부 표면으로부터 약 4.2mm 깊이까지의 홉수선량의 build-up 에 관련 정보를 의료진에 제공할 수 있으며, 금속박막을 얹은 TLD에 관한 실험 결과는 피부 특정 영역에서의 bolus 의 결정에 도움이 될 것으로 사료됨.
Public Memory in Digital Image -In the Case of Forrest Gump
( Lee Sookil ) 한국디지털영상학회 2016 디지털영상학술지 Vol.13 No.-
The movie is definitely nostalgic about the recent American history and good old Deep South. If I were an American, I could have felt the specific nostalgia related with the uncommon events in recent history with the general feeling of love, friendship and loyalty. However, with the enchantment, there is something uncomfortable in the movie. With the disguise of the beautiful and touching love story, the movie seems to tackle the progressive years in the American history very severely. While every crew of the movie insists that there is no political implication in the movie, the implication is so evident that it is no wonder why the movie was used at the political campaign in 1994 by the Republican party. How is it possible? How can you enjoy one movie emotionally while at the same time hating it logically? In this paper, I will analyze one Hollywood movie, Forrest Gump as a `nostalgic political melodrama` arguing its function as a rightist weapon for the cultural war in the 1990s while detailing the function of adaptation, star, director and the movie itself.
Kim, Sookil KOSIN UNIVERSITY COLLEGE OF MEDICINE 2006 高神大學校 醫學部 論文集 Vol.21 No.1
Background: To determine the radiation dose received to the thyroid gland as a result of thoracic irradiation in the patients with lung cancers, and the factors influencing that dose. Methods: The dose to the thyroid resulting from the simulated irradiation of the chest of an adult anthropomorphic(humanoid) phantom with 6MV X-rays was measured using thermoluminescent dosimeters (TLDs). The dependence of dose on the distance of the x-ray source was measured. The effects of a bolus was also determined. Results: Using shielded field, the thyroid region received 13-16% of the prescribed dose on the surface of phantom and 32-33% in phantom for 6MV X-rays. The dose increased as the measurement point on skin closer to the x-ray source due to tissue scatter. Placement of a bolus around the neck increase the thyroid dose by 30% compared to the thyroid dose without bolus. Conclusion: For prophylactic irradiatiion doses of 2000 cGy in the adult phantom, the dose to the thyroid was about 300 cGy(15%). As the thyroid is very sensitive to radiation and the dose-response curve for thyroid tumor induction is linear, attempts to shield the thyroid during prophylactic irradiation are mandatory. The use of shielding block and bolus were important factors in determining thyroid dose.
Kim, Sookil 고신대학교 의학부 1994 高神大學校 醫學部 論文集 Vol.10 No.1
Si(111) 기판 위에 Pd를 증착시킨 뒤 실온 하에 80 keV의 에너지를 가진 Ar^(-)이온을 Pd/Si 이중박막 위에 조사시켰다. Ar^(+) 이온을 조사한 이중박막에 열을 가하면서 규소화합물의 생성온도와 표면상태의 개선 정도를 RBS, XRD, AES 등을 이용하여 연구하였다. Ar^(-) 이온조사에 의하여 Pd_(2)Si 생성 온도는 현저하게 낮아지고 표면의 상태는 상당히 개선된 것으로 관측되었다. 이러한 보다 낮은 온도에서의 Pd-silicide 형성과 매끄러운 표면의 개질은 원자혼합과정에 따라 박막사이의 구성성분의 분산에 의한 것으로 설명되어진다.