Far field 3D localization of radioactive hot spots using a coded aperture camera. (January 2016)

• Record Type: Journal Article
• Authors: Shifeng, Sun; Zhiming, Zhang; Lei, Shuai; Daowu, Li; Yingjie, Wang; Yantao, Liu; Xianchao, Huang; Haohui, Tang; Ting, Li; Pei, Chai; Yiwen, Zhang; Wei, Zhou; Mingjie, Yang; Cunfeng, Wei; Chuangxin, Ma; Long, Wei
• Is Part Of: Applied radiation and isotopes. Volume 107(2016:Jan.)
• Page Start: 177
• Page End: 182
• Publication Date: 2016-01
• Subjects: Source localization -- Source activity determination -- Coded aperture -- Far-filed measurements -- Gamma camera -- Modified Uniformly Redundant Array (MURA); Radiology -- Periodicals; Radiation -- Industrial applications -- Periodicals; Nuclear chemistry -- Periodicals; Internet resource; Periodical; 660.298
• DOI: 10.1016/j.apradiso.2015.10.021
• Languages: English
• ISSNs: 0969-8043

Abstract

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 6 mm 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. Highlights: A method is presented to remotely estimate source activity. The method allows determination of source location from a single projection. A tungsten–copper alloy coded aperture mask is used to modulate the incoming gamma-rays. The method was successfully tested for point and line sources.