• Title, Summary, Keyword: Baggage inspection

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Development of Dual Energy Radiation Detector (이중 에너지 방사선 검출기 개발)

  • Yeo, Hwa-Yeon
    • Journal of the Korean Society of Radiology
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    • v.4 no.3
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    • pp.5-11
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    • 2010
  • In this paper, we are suggested development of dual-mode detector for dual-energy digital radiography. Design of dual-energy radiography module for commercial BIS (Baggage Inspection System) is used in the spectrum of the X-ray generator and detector for dual-mode features and radiological characteristics were analyzed. BIS suggestl on the image detector module being used to target X-ray tube to simulate X-ray spectrum and simulated spectrum to offer through the new radiographic characteristics of the detector modules were investigated. Using X-ray experiments with an increase in the thickness of the copper filter low energy detector (LED) and high-energy detector (HED) as the difference between the output signal increases. HED, especially in the size of the output signal decreases with increasing thickness of the copper filter was found.

Effects of Shift Pattern and Expertise on Perceived Workload and Performance for Aviation Security Screeners (항공보안검색요원의 교대근무유형과 경력에 따른 주관적 업무부하와 수행)

  • Chung, Eun Kyoung;Shin, Younghwan;Sohn, Young Woo
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.24 no.3
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    • pp.1-9
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    • 2016
  • The study examined the effects of shift pattern and expertise on perceived workload and performance for aviation security screeners. 18 security screeners participated in this study, in which data were analyzed by dividing them into two groups (experts vs. less-experts). We measured their perceived workloads and performances (i.e., reading time through X-ray) as a function of shift pattern and time condition. As a result, highly experienced screeners (experts) showed high workload during the morning shift, while lowly experienced screeners (less-experts) reported high workload during the full-day and the afternoon shifts. In addition, less-experts took a longer time to inspect the baggage when they worked for the full-day and the afternoon shifts. Particularly, in the last time slot of the full-dat shift, expert screeners had a high workload, while both groups showed a high-level of workload at around 17:30 in the afternoon shift.

Image System Using Dual Energy Detector (이중 에너지 검출기를 이용한 영상 시스템)

  • Yeo, Hwa-Yeon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.9
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    • pp.3517-3523
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    • 2010
  • Single exposure dual X-ray imaging can be used to separate soft and dense-material images for medical and industrial applications. This study keep focusing baggage inspection system(BIS) specifically. New detector modules for single exposure dual X-ray imaging are consisted of low energy detector (LED) and high energy detector (HED). First, the optimized thickness of copper filter coupled HED to separate low energy and high energy was simulated by the given X-ray energy (140 kVp, 1 mA) using Monte Carlo simulation codes, MCNPX. So as a result of simulation, the copper filter thickness is 0.7 mm. For the design of PIN photodiode, ATLAS device simulation tool was used. 16 channels PIN photodiode of 1.5 mm ${\times}$ 3.2 mm for Dual X-ray imaging detector was fabricated in the process of ETRI. And its dark current and quantum efficiency, terminal capacitance were measured. It was proven that the Lanex Fast B coupled HED were a sufficient candidate to replace the CsI(Tl) commerced in dual X-ray system, since these give a strong signal, overcoming system noise. Finally dual X-ray image was acquired through correction of the LED X-ray Image and the HED X-ray Image.

Design of a 32-Channel Readout System for X-ray Cargo Inspection (X-선 수하물 검색 시스템을 위한 32 채널 리드아웃 시스템 설계)

  • Kim, Young Soo;Choi, Hyojeong;Kim, Han Soo;Lee, Seung-Jae;Park, Jeong Min;Kang, Chang Goo;Park, Ah Hyun;Ha, Jang Ho
    • Journal of Radiation Industry
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    • v.12 no.3
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    • pp.255-260
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    • 2018
  • In recent years, X-ray cargo inspection systems have been rapidly being installed at ports, airports, and borders to strengthen the security of baggage and the prohibition of transaction with drugs and contraband. We at Korea Atomic Energy Research Institute are currently developing a dual-energy X-ray cargo inspection system. In this study, a 64-channel charge sensitive readout system consisting of two 32-channel readout systems has been designed for collecting and amplifying signal charges from detector arrays. The 32-channel readout system was composed of 8 detector arrays (four photodiodes per one detector array, 2 mm pitch), 32 hold switches, 32 charge integrators, 32 reset switches, 32 sample-and-holds, 32 output switches, an output buffer, a frequency divider (divide by 4), and a 32-bit shift register. Each component was well designed and optimized for our system, and the size of the fabricated circuit board is $135mm{\times}71.5mm$. From the visible light tests, the output pulses and the corresponding images were successfully acquired according to the intensity of the incident light.