Analysis of electronic autoradiographs by mathematical post-processing. Issue 1 (1st February 2016)

• Record Type: Journal Article
• Authors: Ghosh, S.; Baier, M.; Schütz, J.; Schneider, F.; Scherer, U.W.
• Is Part Of: Radiation effects and defects in solids. Volume 171:Issue 1/2(2016)
• Page Start: 161
• Page End: 172
• Publication Date: 2016-02-01
• Subjects: Autoradiography -- reactor graphite -- i-graphite -- decontamination -- radioactive waste treatment; Radiation chemistry -- Periodicals; Crystals -- Defects -- Periodicals; Crystal lattices -- Periodicals; 530.416
• DOI: 10.1080/10420150.2016.1155587
• Languages: English
• ISSNs: 1042-0150

Abstract

ABSTRACT: Autoradiography is a well-established method of nuclear imaging. When different radionuclides are present simultaneously, additional processing is needed to distinguish distributions of radionuclides. In this work, a method is presented where aluminium absorbers of different thickness are used to produce images with different cut-off energies. By subtracting images pixel-by-pixel one can generate images representing certain ranges of β-particle energies. The method is applied to the measurement of irradiated reactor graphite samples containing several radionuclides to determine the spatial distribution of these radionuclides within pre-defined energy windows. The process was repeated under fixed parameters after thermal treatment of the samples. The greyscale images of the distribution after treatment were subtracted from the corresponding pre-treatment images. Significant changes in the intensity and distribution of radionuclides could be observed in some samples. Due to the thermal treatment parameters the most significant differences were observed in the 3 H and 14 C inventory and distribution.