NDLI: Portable nuclear safeguard equipment using pinhole gamma camera

Content Provider	IEEE Xplore Digital Library
Author	Cheol-Ha Baek Ji Yeon Hwang Su Jung An Hyun-Il Kim Sung-Woo Kwak Yong Hyun Chung
Copyright Year	2010
Description	Author affiliation: Korea Institute of Nuclear Nonproliferation and Control, Daejeon 305-348, South Korea (Sung-Woo Kwak) \|\| Department of Radiological Science, College of Health Science, Yonsei University, Wonju, 220-710, South Korea (Cheol-Ha Baek; Ji Yeon Hwang; Su Jung An; Hyun-Il Kim; Yong Hyun Chung)
Abstract	The collimator design for nuclear survey system should be differently taken into consideration from the collimator for medical environments because it has always been used in the high-energy radiation environments. The purpose of this study is to research the optimum pinhole design for accomplishing the improved image at high-energy radiation field under condition. The relative resolution and sensitivity advantages of pinhole collimators were investigated using analytic formulations and Monte Carlo simulations. Simulations using GATE (Geant4 Application for Tomographic Emission) were performed to model the pinhole gamma camera system. A gamma camera consists of a cone-shaped pinhole collimator with a tungsten aperture and a CsI(Tl) scintillation crystal 6.0 mm thick and 50.0 mm ´ 50.0 mm in area. The focal length and the acceptance angle of the pinhole collimator were set to 60.35 mm and 45°, respectively. The intrinsic spatial resolution and sensitivity were simulated by changing the pinhole diameter and channel height. The point source was located 60.35 mm above the center of the pinhole, and the projection data was estimated for pinhole diameter values from 2.0 mm to 4.0 mm while the channel heights were fixed between 2.0 mm and 6.0 mm. The optimal ranges of channel height and pinhole diameter were determined through evaluation of the intrinsic resolution and sensitivity tradeoff curves. The channel type is selected by these analyses and we also verify these simulation results through experimental test of three types of collimators. We allowed to determine the optimal values of pinhole diameter and channel height to be 2, 3, 4 mm and 6, 4, 6 mm, respectively. The simulated and experimental results agreed with 6% and 14% discrepancies in sensitivities and spatial resolution, respectively. The results demonstrated that the pinhole collimator designed in this study could be utilized to perform radiation monitoring system.
Starting Page	454
Ending Page	456
File Size	559185
Page Count	3
File Format	PDF
ISBN	9781424491063
ISSN	10957863
e-ISBN	9781424491056
DOI	10.1109/NSSMIC.2010.5873800
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Collimators Sensitivity Cameras Spatial resolution Crystals Logic gates Apertures environmental monitoring Pinhole gamma camera GATE
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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