title: Far field 3D localization of radioactive hot spots using a coded aperture camera.
abstract: This paper presents a coded aperture method to remotely estimate the radioactivity of a source. The activity is estimated from the detected counts and the estimated source location, which is extracted by factoring the effect of aperture magnification. A 6mm thick tungsten-copper alloy coded aperture mask is used to modulate the incoming gamma-rays. The location of point and line sources in all three dimensions was estimated with an accuracy of less than 10% when the source-camera distance was about 4 m. The estimated activities were 17.6% smaller and 50.4% larger than the actual activities for the point and line sources, respectively.
authors.affiliation: Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: sunshf@ihep.ac.cn.
authors.forename: Sun
authors.initials: S
authors.lastname: Shifeng
authors.affiliation: Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China.
authors.forename: Zhang
authors.initials: Z
authors.lastname: Zhiming
authors.affiliation: Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China.
authors.forename: Shuai
authors.initials: S
authors.lastname: Lei
authors.affiliation: Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China.
authors.forename: Li
authors.initials: L
authors.lastname: Daowu
authors.affiliation: Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China.
authors.forename: Wang
authors.initials: W
authors.lastname: Yingjie
authors.affiliation: Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China.
authors.forename: Liu
authors.initials: L
authors.lastname: Yantao
authors.affiliation: Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China.
authors.forename: Huang
authors.initials: H
authors.lastname: Xianchao
authors.affiliation: Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China.
authors.forename: Tang
authors.initials: T
authors.lastname: Haohui
authors.affiliation: Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China.
authors.forename: Li
authors.initials: L
authors.lastname: Ting
authors.affiliation: Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China.
authors.forename: Chai
authors.initials: C
authors.lastname: Pei
authors.affiliation: Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China.
authors.forename: Zhang
authors.initials: Z
authors.lastname: Yiwen
authors.affiliation: Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Zhou
authors.initials: Z
authors.lastname: Wei
authors.affiliation: Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Mingjie
authors.affiliation: Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Cunfeng
authors.affiliation: Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China.
authors.forename: Ma
authors.initials: M
authors.lastname: Chuangxin
authors.affiliation: Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China. Electronic address: weil@ihep.ac.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Long
keywords: Coded aperture; Far-filed measurements; Gamma camera; Modified Uniformly Redundant Array (MURA); Source activity determination; Source localization