Abstract
A compact portable /spl gamma/-ray vision system consisting of a lead multi-hole collimator, CsI(Tl)/photodiode detector array, CCD camera and personal computer, has been constructed and tested. The optical picture obtained with a CCD camera is overlaid with /spl gamma/-ray intensity distributions at different energies to enable immediate localization of multiple radioactive sources. The /spl gamma/-ray detector employs a shielded array of sixteen 1/spl times/1/spl times/3 cm CsI(Tl) scintillation crystals, each of which is viewed by a 1 cm square Hamamatsu PIN silicon photodiode. The device operates in the energy range from 100 keV to 3 MeV with an average energy resolution of about 7% FWHM, and angular resolution of about 40 FWHM at 662 keV. The collected /spl gamma/-ray distribution is processed using a maximum-likelihood algorithm to provide a more precise reconstruction of the /spl gamma/-emitter distribution. The detector system is mounted on a pan-and-tilt table; the total weight of the imaging system is about 30 kg. The performance of this instrument has been tested in our laboratory and the results show that this system should be a competitive candidate for radiation monitoring in nuclear facilities.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
