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Development of an AC-coupled Silicon Pad Array Detector
현효정,J.B Bae,D.H Kah,K. H. Kang,H. J. Kim,H Park,H. O. Kim 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.9
Large area silicon pad arrays are used in many applications such as high energy physics and cosmic ray experiments, and radiation monitoring/imaging. AC-coupled silicon pad arrays are designed and fabricated. The measured electrical characteristics show good results. The signal readout electronics and data acquisition systems for the electric signals and data analysis are developed. The analog signal from the array sensors is processed by a VATA analog chip. The signal-to-noise ratio is measured to be 20.1 on average after coherent noise subtraction. Phantoms of a copper thin foil with a cross-shaped hole and of a 3-mm thick lead plate with diamond and cross shapes are prepared for imaging measurements. The phantom image is taken by using a radioactive source and proton beam. Optimization analysis are performed to improve the image quality. The performance results show that the developed silicon pad array detector can be used for charge and energy profile measurements of incoming particles in physics applications and for a radiation imaging detector.
Radiation Damage Study of AC-Coupled Silicon Strip Sensors with a Proton Beam
현효정,박환배,가동하,H.D Kang,김홍주,Jinho Moon,Kyeryung Kim,유상수,이상훈,Sangpil Yun 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
We designed and fabricated AC-coupled silicon strip sensors that could be good detectors for X-ray imaging, particle detection, radiation monitoring, {\it etc.} Silicon sensors are known to have good position and energy resolution, but to be susceptible to radiation damage. Therefore, it is important to test the effects of radiation damage to the fabricated AC-coupled silicon strip sensors. For this purpose, the 45 MeV proton beam from the MC-50 cyclotron at the Korea Institute of Radiological and Medical Science (KIRAMS) in Seoul, Korea, was used. Four AC-coupled silicon strip sensors were exposed to 10$^8\sim10^{11}$ proton fluences, and the total leakage current was measured and analyzed by comparing the results before and after the proton beam irradiation, and essential progress in the understanding of radiation-induced detector deterioration is presented.
아동치과주치의 시범사업 성과평가 - 도입 2차 연도 중심 -
한승진,안효정,현유림,권오탁 건강보험심사평가원 심사평가정책연구소 2023 연구보고서 Vol.2023 No.0
Since May 2021, the Korean government has introduced the 'Child Dental Clinic Pilot Project' as a prevention-focused continuous oral care project to improve children's oral health and has been operating it for three years. The pilot project is scheduled to end in May 2024, and a performance evaluation of the pilot project must be conducted. The purpose of this study is to evaluate the performance of the pilot project after the second year of its introduction and to prepare ways to improve the pilot project in the future. In this study, the system of the pilot project was reviewed, the performance of the pilot project was evaluated through selection of a pilot project performance evaluation model and analysis of evaluation indicators, and improvement measures for the pilot project were reviewed. National Health Insurance Claims Database (NHICD) collected by the Health Insurance Review & Assessment Service (HIRA) and the Child Dental Clinic Pilot Project Registry were linked and analyzed to calculate the evaluation indicators. A survey of participants was conducted to determine satisfaction with the project and improvement plans. As a result of the pilot project performance evaluation, in terms of accessibility, the participation rate of children in the pilot project was 24.5%, an increase from 18.8% in the first year, but the proportion of children who participated only once was high at 43.5%, so children's continuous participation was necessary. In terms of quality of medical care, parents' satisfaction with the pilot project was 84.7 points, an increase of 2.2 points compared to last year, and attending physicians' satisfaction was 74.5 points. In terms of medical care utilization, the dental medical care use of children who participated in the pilot project increased by 21.9% after the project compared to before the project, while that of children who did not participate decreased by 14.0%. The proportion of dental caries diagnoses among children who participated in the pilot project decreased by 1.5%p, and increased by 2.6%p among children who did not participate. The proportion of preventive services for children who participated in the pilot project increased by 1.3%p, a larger increase than for children who did not participate (0.9%p). Although the number of dental visits among children in Korea decreased during the pilot project period due to the impact of the COVID-19 infectious disease, participation in the pilot project increased opportunities for regular dental visit habits, while reducing the proportion of dental caries. In terms of effectiveness, children who continuously participated in the pilot project had a 1.3%p decrease in negative perception of oral health, improved oral health awareness, and a 4.5%p increase in the rate of correct snack consumption habits. In terms of oral health, the PHP index score of children who continued to participate in the pilot project improved by 17.5%, improving oral hygiene, and the permanent tooth caries prevalence decreased by 4.6%p and the permanent tooth caries rate decreased by 15.6%p, improving oral health. In addition, the proportion of respondents who responded that their oral-related quality of life was ‘good’ also increased by 3.9%p, confirming the improvement effect of the pilot project on oral health. As a result of reviewing the improvement plan for the pilot project, the plan to expand the target age for the pilot project should be decided by considering the effectiveness of the project for children in lower grades. There were many opinions on applying the cavity treatment service to the pilot project, but agreement on the scope of the service is needed. Improvement of publicity is necessary to revitalize the pilot project, and improving the level of service provision is a priority rather than reducing patients' out-of-pocket costs.
배재범,현효정,가동하,김현옥,박환배,정명환,라세진 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.22
We develop a backside illuminated photo-sensor that is fabricated on a <100>-oriented, high resistivity n-type 400 μm thick silicon wafer. The PIN photodiode is designed and manufactured as a radiation detector for alpha particles and low energy gamma-rays. The silicon photo-sensor is susceptible to radiation damage. Therefore, it is important to investigate the effects of radiation damage to the fabricated PIN photodiode. We measure the radiation damage to a PIN photodiode by a 35 MeV proton beam at the Korea Institute of Radiological and Medical Sciences (KIRAMS). We present the effects of proton radiation on the electrical properties of the PIN photodiode.
Electrical Characteristics and Radiation Detection Performance of Large-area Photodiodes
배재범,현효정,가동하,강국현,박환배 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.7
Photodiodes with the size of 2.3 × 2.3 cm2 are fabricated on n-type silicon wafers with highresistivity (>5 k·cm) for physics applications. The photodiodes are fully depleted to collect signalsproduced by incoming particles. We measure the leakage currents and the capacitances of thephotodiodes as functions of the reverse bias voltage. The photodiodes with leakage currents < 70nA/cm2 are used to measure the signal-to-noise ratio (SNR) by using a 45 MeV proton beam fromthe MC-50 cyclotron at the Korea Institute of Radiological and Medical Sciences (KIRAMS) and a90Sr radioactive source. The SNRs are measured for the photodiode only and for photodiode coupledwith a 5 mm thick plastic scintillator. The proton beam energy is controlled by using a degrader,and the pulse heights are measured for different energies of the proton beam. The radiation damageeffect is also measured in an environment of 1.18 × 1010 protons/cm2. In this paper, we present notonly the SNR measurements using the proton beam and the radioactive source but also the resultof the radiation damage test.