Fig. 5. Enlarged prompt gamma-rays spectra of chloride-contaminated cement concrete slab at 1.25, 11.25 and 21.25 cm distance from the moderator superimposed upon each other over 2.70–7.03 MeV.Figure optionsDownload full-size imageDownload as PowerPoint slide
Fig. 6. Enlarged prompt gamma-ray spectra of chloride-contaminated cement concrete slab at 1.25, 6.25 and 16.25 cm distance from the moderator superimposed upon each other over 2.79–7.03 MeV.Figure optionsDownload full-size imageDownload as PowerPoint slide
Both the figures show TCID decreasing trend of chlorine prompt gamma-ray yield as the distance of chloride contaminated slab increases from the moderator disk. This is due to decreasing thermal neutron flux at the location of chloride-contaminated slab with increasing distance from the moderator slab. The intensity of gamma-ray is further decreased due to increasing photon scattering with depth of the specimen.
Finally, the 6.11 MeV chlorine gamma-ray yield from the chloride-contaminated SF cement concrete slab spectra for 15.25, 20.25, 25.25, 30.25 and 35.25 cm distance was obtained after subtraction of prompt gamma-ray spectra of uncontaminated SF cement concrete specimen, described elsewhere in detail (Naqvi et al., 2012 and Naqvi et al., 2014).