• Title/Summary/Keyword: Radiation monitoring system

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Optimization of a fiber optic probe for non-invasive blood glucose monitoring

  • Kang, Na-Roo;Baek, Ju-Hyun;Woo, Young-Ah;Lee, Hyun-Chul;Kim, Hyo-Jin
    • Proceedings of the PSK Conference
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    • 2002.10a
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    • pp.407.3-408
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    • 2002
  • A portable near infrared (NIR) system which was newly integrated by our lab has been used to develop a non-invasive blood glucose monitoring. The portable NIR system includes a tungsten halogen lamp, a photo diode array type-InGaAs detector, and specialized reflectance fiber optic probes. The shape of probes is composed of two parts. one for illumination into sample and the other for receiving the radiation from sample. Three kinds of probes with different distance between illumination and receiving part. such as 0.03. 0.1. and 0.5mm, were investigated for optimization. (omitted)

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Emergency Environmental Monitoring for the Decision-Aiding on Public Protective Actions during a Nuclear Accident (원자력 사고시 주민 보호조치 결정 지원을 위한 비상 환경감시)

  • Choi, Yong-Ho;Choi, Geun-Sik;Han, Moon-Hee;Lee, Han-Soo;Lee, Chang-Woo
    • Journal of Radiation Protection and Research
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    • v.30 no.3
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    • pp.131-148
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    • 2005
  • In a nuclear emergency, protective actions for the public should be taken in time. It is internationally proposed that generic intervention levels (GILs) and generic action levels, determined based on cost-benefit analyses, be used as the decision criteria for protective actions. Operational intervention levels (OILs) are directly or easily measurable quantities corresponding to these generic levels. To assess the necessity of protective actions in a nuclear emergency, it is important that the environmental monitoring data required for applying and revising OILs should be promptly produced. It is discussed what and how to do for this task in the course of the emergency response. For an emergency environmental monitoring to be performed effectively, a thorough preparedness has to be made including maintenance of the organization and equipments, establishment of various procedure manuals, development of a supporting computer system and periodical training and exercises. It is pointed out that Korean legal provisions concerning GILs and OILs need to be amended or newly established.

GAMMA-SPECTROMETRY IN ENVIRONMENTAL MONITORING OF NUCLEAR POWER

  • Cechak, Tomas;Gerndt, Josef;Kluson, Jaroslav;Musilek, Ladislav;Thinova, Lenka
    • Journal of Radiation Protection and Research
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    • v.26 no.3
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    • pp.203-206
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    • 2001
  • The mathematical processing (unfolding) of pulse height spectra from a scintillation detector helps to calculate the photon fluence rate energy distribution in a measured photon field. The data processing is based on the knowledge of detection system response function and directional dependence respectively. The experimental results of the photon fields measurements in the vicinity of the spent fuel temporary storage and inside the storage hall are presented. The containers Castor 440 are used for temporary storing of the burnt up fuel assemblies in the Czech nuclear power plant Dukovany. A set of periodical measurements was performed in order to get basic information on the time dependence of the photon fields spatial distributions and spectral characteristics in the temporary storage hall and its vicinity. The photon fields were measured by the scintillation system. The obtained photon fields spatial distributions and spectral characteristics present the information on the radiation hazard in the storage.

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The Study on the Reliability Enhancement for Solar Energy Resources Using the Data quality Management System in Korea (Focused on Data Error Analysis) (품질관리시스템을 활용한 태양에너지자원 신뢰성 향상에 관한 연구)

  • Jo, Dok-Ki;Kang, Young-Heack
    • Journal of the Korean Solar Energy Society
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    • v.27 no.1
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    • pp.19-27
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    • 2007
  • The Data quality management system(DQMS) organizes and helps manage and process time sequence data usually collected in monitoring networks and programs. DQMS places particular emphasis on data qualify while maintaining a highly organized and convenient structure for data. It operates with in a flexible and powerful commercial relational data base environment which can readily link to other software platforms from local spreadsheets to network server. The Korea Institute of Energy Research(KIER) has been solar radiation data since May, 1991 for 16 different locations. KIER's new data is expected to be extensively used by designer and researchers of solar systems in lieu of unreliable old ones. Unfortunately, the quality of the data has not always been properly mentioned. The purpose of this study is to systematically identify errors in such data set using DQMS in an effort to rehabilitate error-ridden old data. DET successfully uncovered solar radiation data that had questionable quality.

Development of Neutron, Gamma ray, X-ray Radiation Measurement and Integrated Control System (중성자, 감마선, 엑스선 방사선 측정 및 통합 제어 시스템 개발)

  • Ko, Tae-Young;Lee, Joo-Hyun;Lee, Seung-Ho
    • Journal of IKEEE
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    • v.21 no.4
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    • pp.408-411
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    • 2017
  • In this paper, we propose an integrated control system that measures neutrons, gamma ray, and x-ray. The proposed system is able to monitor and control the data measured and analyzed on the remote or network, and can monitor and control the status of each part of the system remotely without remote control. The proposed system consists of a gamma ray/x-ray sensor part, a neutron sensor part, a main control embedded system part, a dedicated display device and GUI part, and a remote UI part. The gamma ray/x-ray sensor part measures gamma ray and x-ray of low level by using NaI(Tl) scintillation detector. The neutron sensor part measures neutrons using Proportional Counter Detector(low-level neutron) and Ion Chamber Type Detector(high-level neutron). The main control embedded system part detects radiation, samples it in seconds, and converts it into radiation dose for accumulated pulse and current values. The dedicated display device and the GUI part output the radiation measurement result and the converted radiation amount and radiation amount measurement value and provide the user with the control condition setting and the calibration function for the detection part. The remote UI unit collects and stores the measured values and transmits them to the remote monitoring system. In order to evaluate the performance of the proposed system, the measurement uncertainty of the neutron detector was measured to less than ${\pm}8.2%$ and the gamma ray and x-ray detector had the uncertainty of less than 7.5%. It was confirmed that the normal operation was not less than ${\pm}15$ percent of the international standard.

Implement of Web-based Remote Monitoring System of Smart Greenhouse (스마트 온실 통합 모니터링 시스템 구축)

  • Dong Eok, Kim;Nou Bog, Park;Sun Jung, Hong;Dong Hyeon, Kang;Young Hoe, Woo;Jong Won, Lee;Yul Kyun, Ahn;Shin Hee, Han
    • Journal of Practical Agriculture & Fisheries Research
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    • v.24 no.4
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    • pp.53-61
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    • 2022
  • Growing agricultural products in greenhouses controlled by creating suitable climatic conditions and root zone of crop has been an important research and application subject. Appropriate environmental conditions in greenhouse are necessary for optimum plant growth improved crop yields. This study aimed to establish web-based remote monitoring system which monitors crops growth environment and status of crop on a real-time basis by applying to greenhouses IT technology connecting greenhouse equipment such as temperature sensors, soil sensors, crop sensors and camera. The measuring items were air temperature, relative humidity, solar radiation, CO2 concentration, EC and pH of nutrient solution, medium temperature, EC of medium, water content of medium, leaf temperature, sap flow, stem diameter, fruit diameter, etc. The developed greenhouse monitoring system was composed of the network system, the data collecting device with sensors, and cameras. Remote monitoring system was implemented in a server/client environment. Information on greenhouse environment and crops is stored in a database. Items on growth and environment is extracted from stored information, could be compared and analyzed. So, A integrated monitoring system for smart greenhouse would be use in application practice and understanding the environment and crop growth for smart greenhouse management. sap flow, stem diameter and pant-water relations

Optimization of Acquisition Time of Beta-Gamma Coincidence Counting System for Radioxenon Measurement (방사성제논 탐지를 위한 베타-감마 동시 계측시스템의 측정시간 최적화)

  • Byun, Jong-In;Park, Hong-Mo;Choi, Hee-Yeoul;Song, Myeong-Han;Yun, Ju-Yong
    • Journal of Radiation Protection and Research
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    • v.40 no.3
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    • pp.181-186
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    • 2015
  • Measurement of xenon radioisotopes from nuclear fission is a key element for monitoring underground nuclear weapon tests. $^{131m}Xe$, $^{133}Xe$, $^{133}mXe$ and $^{135}Xe$ in the air can be detected via low background systems such as a beta-gamma coincidence counting system. Radioxenon monitoring is performed through air sampling, xenon extraction, measurement and spectrum analysis. The minimum detectable concentration of $^{135}Xe$ can be significantly variable depending on the sampling time, extraction time and data acquisition time due to its short half-life. In order to optimize the acquisition time with respect to certain experimental parameters such as sampling and xenon extraction, theoretical approach and experiment using SAUNA system were performed to determine the time to minimize the minimum detectable concentration, which the results were discussed.

Localization of hotspots via a lightweight system combining Compton imaging with a 3D lidar camera

  • Mattias Simons;David De Schepper;Eric Demeester;Wouter Schroeyers
    • Nuclear Engineering and Technology
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    • v.56 no.8
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    • pp.3188-3198
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    • 2024
  • Efficient and secure decommissioning of nuclear facilities demands advanced technologies. In this context, gamma-ray detection and imaging are crucial in identifying radioactive hotspots and monitoring radiation levels. Our study is dedicated to developing a gamma-ray detection system tailored for integration into robotic platforms for nuclear decommissioning, offering a safe and automated solution for this intricate task and ensuring the safety of human operators by mitigating radiation exposure and streamlining hotspot localization. Our approach integrates a Compton camera based 3D reconstruction algorithm with a single Timepix3 detector. This eliminates the need for a second detector and significantly reduces system weight and cost. Additionally, combining a 3D camera with the setup enhances hotspot visualization and interpretation, rendering it an ideal solution for practical nuclear decommissioning applications. In a proof-of-concept measurement utilizing a 137Cs source, our system accurately localized and visualized the source in 3D with an angular error of 1° and estimated the activity with a 3% relative error. This promising result underscores the system's potential for deployment in real-world decommissioning settings. Future endeavors will expand the technology's applications in authentic decommissioning scenarios and optimize its integration with robotic platforms. The outcomes of our study contribute to heightened safety and accuracy for nuclear decommissioning works through the advancement of cost-effective and efficient gamma-ray detection systems.

Case Report of Radiotherapy to a Breast Cancer Patient with a Pacemaker (인공심장박동기가 이식된 유방암환자의 방사선 치료에 대한 사례 보고)

  • Chae, Seung-Hoon;Park, Jang-Pil;Lee, Yang-Hoon;Yoo, Suk-Hyun;Seong, Won-Mo;Kim, Kyu-Bo
    • The Journal of Korean Society for Radiation Therapy
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    • v.24 no.2
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    • pp.197-203
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    • 2012
  • Purpose: In this study, we considerate our radiation therapy process for the breast cancer patient implanted a pacemaker applying the machine movement surgery, shielding, beam selection. Materials and Methods: We perform radiation therapy to a 54 years old, breast cancer patient implanted a pacemaker. The patient underwent a surgery to move the position of a pacemaker to right side breast after consultation with cardiology department. Prescribed dose was 5,040 cGy and daily dose 180 cGy for 28 fractions. The 10 MV photon energy, field size 0/$9.5{\times}20$ cm, half beam and opposing portal irradiation are used. To find out appropriate thickness of shielding board, we carried out an experiment using a solid water phantom ($30{\times}30{\times}7$ cm), a Farmer-type chamber (TN30013, PTW, Germany) and a shielding board (Pb $28{\times}27{\times}0.1$ cm). We calculated expected absorbed dose to te pacemaker with absorb ratio and shielding ratio. In the PTP system (Eclipse, Varian, USA), we figured out how much radiation would be absorbed to the machine with and without shielding. First day of the radiation therapy, we measured head scatter to the pacemaker with MOSFET Dose Verification System (TN-RD-70-W, Medical Canada Ltd., Canada). Results: In the phantom measurement, we found out appropriate thickness was 2 mm of shielding board. In the RTP, when using 2 mm shielding the pacemaker will be absorbed 11.5~38.2 cGy and DVH is 77.3 cGy. In the first day of the therapy, 4.3 cGy was measured so 120.4 cGy was calculated during total therapy. The patient was free from any side effects, and the machine also normally functioned. Conclusion: As the report of association which have public confidence became superannuated, there is lack of data about new machine. We believe that radiation therapy to thiese kind of patients could be done successfully with co-operation, patient-suitable planning, accurate QA, frequent in-vivo dosimetry and monitoring.

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Measurement of Surface Temperature for Real Time Monitoring of the GMA Welding Processes (GMA용접공정의 실시간 모니터링을 위한 표면온도 측정)

  • 부광석;조형석
    • Proceedings of the KWS Conference
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    • 1994.10a
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    • pp.111-114
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    • 1994
  • This paper describes a method to measure a weldment surface temperature for estimating variations of the weld pool size in the gas metal arc(GMA) welding processes. An Infrared sensing system is designed to measure the radiation emitted from the top surface of the weldment, The interference effect of the electric arc to the measurement is rejected by detecting the low peaks of the noisy signal. An optimizing criterion, in which the correlation between the weld quality and the measured temperature is maximized, is also proposed to determine the optimal measurement location.

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