• Title, Summary, Keyword: 방사선차폐

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Evaluation of Surface Radiation Dose Reduction and Radiograph Artifact Images in Computed Tomography on the Radiation Convergence Shield by Using Sea-Shells (전산화단층영상장비에서 패각을 이용한 방사선 융합차폐체의 표면 방사선량 감소율과 방사선 인공물 영상 평가)

  • Seoung, Youl-Hun
    • Journal of the Korea Convergence Society
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    • v.8 no.2
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    • pp.113-120
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    • 2017
  • The purpose of this present study was to evaluate the surface radiation dose reduction and radiograph artifact images in computed tomography (CT) for the manufactured radiation shields by using sea-shells. The radiation convergence shields were made from silicons, sea-shells, barium powders, producted circle types of diameter 50 mm, thickness 3.5 mm for 5 kinds (only silicon shield, only barium shield, mixed sea-shells with silicon shield, mixed barium with silicon shield, mixed sea-shells with barium and silicon shield). Radiation generation and acquisition were used 4-channel multi-detector CT. The results of this study showed that mixed sea-shells with silicon shields could reduce the surface dose of 5.3% without radiograph artifact images. In the future, we will expect the radiation convergence shield as environmentally friendly materials by using the recycling of sea-shells with the advantages of silicon which can make various shapes.

Development of Radiation Shield with Environmentally-Friendly Materials ; Ⅰ: Comparison and Evaluation of Fiber, Rubber, Silicon in the Radiation Shielding Sheet (친환경 소재의 의료 방사선 차폐 시트 개발 ; I: 섬유, 고무, 실리콘 소재 차폐 시트의 성능 비교평가)

  • Kim, Seon-Chil;Park, Myeong-Hwan
    • Journal of radiological science and technology
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    • v.33 no.2
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    • pp.121-126
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    • 2010
  • Traditionally, lead has been primarily used to shield the radiation in the hospital, because of its soft texture, durability and cost effectiveness. However, lead can be dangerous because of its toxicity when exposed to the human body, and it is classified as a heavy metal like cadmium, mercury, and arsenic etc. In order to compensate its noxious properties on the human body, researchers are trying to develop a radiation shield which has similar shielding efficiency and can also be manufactured in any form. In this study, sulfuric acid barium was mixed with fiber, rubber, and silicon all of which are harmless to the human body, tested, and evaluated for its ability of medical radiation shield. The result of this study showed that the sheet containing silicon and barium has the strongest shielding abilities.

Development of Radiation Shielding Sheet with Environmentally-Friendly Materials; II: Evaluation of Barum, Tourmaline, Silicon Polymers in the Radiation Shielding Sheet (친환경 소재의 의료 방사선 차폐 시트 개발; II: 바륨, 토르말린의 실리콘 폴리머 차폐 시트의 성능 평가)

  • Kim, Seon-Chil;Park, Myeong-Hwan
    • Journal of radiological science and technology
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    • v.34 no.2
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    • pp.141-147
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    • 2011
  • We developed an alternative radiation shielding material which is economical and has high protection efficiency. We validated the material in the form of sheet to make an apron. We increased the rate of barium and mixed tourmaline into silicon to improve the flexibility and protection rate of the sheet. The results showed that the shielding effect at low radiation energy is good enough with both 5 mm and 7 mm thickness. In the future, we will perform a quantitative evaluation of the reproducibility, volumetric efficiency, and porosity in mixing the ingredients.

Monte Carlo Simulation for Radiation Protection Sheets of Pb-Free (무연 방사선 차폐 시트에 대한 몬테카를로 전산모사)

  • Chon, Kwon Su
    • Journal of the Korean Society of Radiology
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    • v.11 no.4
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    • pp.189-195
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    • 2017
  • Radiation protection equipment has widely used to protect human body from radiations, for example X-ray and gamma ray. The material of the radiation protection equipment is mainly lead (Pb) which has brought out lead poisoning and pollution when the equipment is fallen into disuse. This problem makes research and development find new Pb-free materials for use of radiation protection. Manufacturing and evaluation processes for developing those material were carried out repletely until obtaining the performance of protection rate. In this study, combination possibility of shielding material was studied using Geant4 monte carlo simulation. X-ray tube under the same condition in the real measurement of the protection rate was simulated, and X-ray tube spectrum was obtained. The X-ray tube spectrum was applied to study on the protection rate and lead equivalent. The porosity effect was simulated, and was one of key factors to determine protection rate or lead equivalent in radiation protection sheet of Pb-free.

Gamma Radiation Shielding Effect of Various Heavy Concretes Using Domestic Mineral Aggregates

  • Lim, Yong-Kyu
    • Nuclear Engineering and Technology
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    • v.2 no.3
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    • pp.149-161
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    • 1970
  • This paper describes a detailed investigational performance on the gamma radiation shield effect of heavy concretes that were manufactured by the use of mineral ores produced domestically and which may be possibly applied for the biological shield design. Ten different kinds of mineral ores were collected for use as the aggregates, physical test and chemical analysis for them were carried out to select the aggregate with a better property. Through the experimental investigation on the shielding effect of various concretes with different combination of concrete components such as water-cement and fine-coarse aggregate ratios, it was possible to derive some criteria for the best condition being capable of obtaining the concretes with high density and good uniformity. Data on the shielding-effectiveness of the different concretes were obtained by performing collimated beam experiment using 60Co gamma-ray. Analyzing the shielding-efficiency, shielding-concrete specific gravity and biological shield cost, the optimum condition of yielding the best economic shielding design, with low cost and good spatial distribution to some extent was determined.

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A study on the usefulness of a fusion model designed cloak shield to reduce the radiation exposure of the assistant during CT of severely injured patient (중증외상환자 CT 검사 시 검사보조자의 방사선피폭 경감을 위한 융합적 망토 차폐체의 유용성 연구)

  • Seo, Sun-Youl;Han, Man-Seok;Kim, Chang-Gyu;Jeon, Min-Cheol;Kim, Yong-Kyun;Kim, Gab-Jung
    • Journal of the Korea Convergence Society
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    • v.8 no.9
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    • pp.211-216
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    • 2017
  • The purpose of this study is to evaluate the usefulness of a newly fusion model designed cloak shield to reduce the radiation exposure of the assistant during CT(computed tomography) of severely injured patient. Radiation dose was measured in the heart, both axillary and thyroid areas using newly designed cloak shield and existing shield with head phantom and human phantom under the same conditions as brain vascular CT scan. The newly designed cloak shield was measured higher for radiation shielding rate than the existing shields, 61.9 % for heart, 46.2 % for left axillary, 69.8 % for right axillary and 71.1 % for thyroid gland, respectively. a newly developed fusion model of cloak shields are useful for reducing radiation exposure. It is expected to make a significant contribution to reduction of radiation exposure.

Development of Shielding using Medical Radiological Contrast Media; Comparison Analysis of Barium Sulfate Iodine Shielding ability by Monte Carlo Simulation (의료방사선 조영제를 이용한 차폐체 개발; 몬테카를로 시뮬레이션을 통한 황산바륨과 요오드의 차폐능 비교분석)

  • Kim, Seon-Chil
    • Journal of the Korean Society of Radiology
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    • v.11 no.5
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    • pp.329-334
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    • 2017
  • The purpose of this study is to estimating the possibility of manufacturing radiation shielding sheet by searching for environmentally friendly materials suitable for medical environment of medical radiation shielding. There are many tungsten products which are currently used as shielding materials in place of lead, but there are small problems in the mass production of lightweight shielding sheets due to economical efficiency. To solve these problems, a lightweight, environmentally friendly material with economical efficiency is required. In this study, Barium sulphate and Iodine were proposed. Both materials are already used as contrast medias in radiography, and it is predicted that the shielding effect will be sufficient in a certain region as a shielding material because of the characteristic of absorbing radiation. Therefore, in this study, we used a Monte Carlo simulation to simulate radiation shielding materials. When it is a contrast agent such as Barium sulfate and Iodine, the radiation absorption effect in the high energy region appears greatly, and the effectiveness of the two shielding substance in the energy region of the star with thickness of 120 kVp is also evaluated in the medical radiation imaging region. Simulated estimation results it was possible to estimate the effectiveness of shielding for all two substances. Iodine has higher shielding effect than barium sulfate, 0.05 mm thick appears great effect. Therefore, the Monte Carlo simulation confirms that iodine, which is a radiological contrast agent, is also usable as barium sulfate in the production of radiation shielding sheets.

Radiation Protective Effect of the Thyroid Gland Using Bolus Protector in the Dental Cone Beam Computed Tomography (치과 콘빔 전산화단층검사 시 보루스 차폐체를 이용한 갑상선의 방사선 차폐효과)

  • Lee, Tae Hui;Jeong, Seung Hun;Kim, Dong Woo;Park, Myeong Hwan;Kim, Tae-Hyung
    • Journal of the Korean Society of Radiology
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    • v.13 no.3
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    • pp.459-464
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    • 2019
  • In order to minimize the radiation exposure dose of the thyroid site at dental cone-beam computer tomography, a protector using a Bolus was prepared, and the radiation shielding effect and the appropriateness of the image were evaluated. Using a dental cone-beam computed tomography (CBCT), a glass dosimeter was attached to the left and right sides of the thyroid for a dental radiation phantom, and the radiation dose was measured. The absorbed dose for each shield was measured by another method to 10 mm, 20 mm, and 30 mm-thickness, respectively. Eight evaluators evaluated whether or not the medical image is appropriate. When using a 30 mm Bolus shield at the left thyroid site, the resulting value is reduced by an average of $342.67{\mu}Gy$ by 20.7% from the average value of $431.22{\mu}Gy$ measured without using a Bolus shield, the right thyroid site In the case of using 30 mm Bolus shield, it showed a dose reduction effect of 21.9% with an average of $424.56{\mu}Gy$. The adequacy of the medical image was judged to be usable by both evaluators. In conclusion, the dental cone-beam computerized tomography can be used as a useful shielding material because it has a radiation shielding effect and it is possible to treat the diagnosis of the bolus protector in the thyroid without any obstruction shade in order to minimize the radiation dose.

Evaluation of usability of the shielding effect for thyroid shield for peripheral dose during whole brain radiation therapy (전뇌 방사선 치료 시 갑상선 차폐체의 주변선량 차폐효과에 대한 유용성 평가)

  • Yang, Myung Sic;Cha, Seok Yong;Park, Ju Kyeong;Lee, Seung Hun;Kim, Yang Su;Lee, Sun Young
    • The Journal of Korean Society for Radiation Therapy
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    • v.26 no.2
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    • pp.265-272
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    • 2014
  • Purpose : To reduce the radiation dose to the thyroid that is affected to scattered radiation, the shield was used. And we evaluated the shielding effect for the thyroid during whole brain radiation therapy. Materials and Methods : To measure the dose of the thyroid, 300cGy were delivered to the phantom using a linear accelerator(Clinac iX VARIAN, USA.)in the way of the 6MV X-ray in bilateral. To measure the entrance surface dose of the thyroid, five glass dosimeters were placed in the 10th slice's surface of the phantom with a 1.5 cm interval. The average values were calculated by measured values in five times each, using bismuth shield, 0.5 mmPb shield, self-made 1.0 mmPb shield and unshield. In the same location, to measure the depth dose of the thyroid, five glass dosimeters were placed in the 10th slice by 2.5 cm depth of the phantom with a 1.5 cm interval. The average values were calculated by measured values in five times each, using bismuth shield, 0.5 mmPb shield, self-made 1.0 mmPb shield and unshield. Results : Entrance surface dose of the thyroid were respectively 44.89 mGy at the unshield, 36.03 mGy at the bismuth shield, 31.03 mGy at the 0.5 mmPb shield and 23.21 mGy at a self-made 1.0 mmPb shield. In addition, the depth dose of the thyroid were respectively 36.10 mGy at the unshield, 34.52 mGy at the bismuth shield, 32.28 mGy at the 0.5 mmPb shield and 25.50 mGy at a self-made 1.0 mmPb shield. Conclusion : The thyroid was affected by the secondary scattering dose and leakage dose outside of the radiation field during whole brain radiation therapy. When using a shield in the thyroid, the depth dose of thyroid showed 11~30% reduction effect and the surface dose of thyroid showed 20~48% reduction effect. Therefore, by using the thyroid shield, it is considered to effectively protect the thyroid and can perform the treatment.