| || Use of CR 39 Films for Evaluation of Shielding Efficacy of Materials against Fast Neutrons
Author : Kumar, S.;Gopalani, Deepak;Bhatnagar, P.K.;Kumar, R.;Baheti, G.L.;Kumar, A.
Source : Defence Science Journal ; Vol:42(4) ; 1992 ; pp 231-233
Subject : 620.1 Material Science and Technology
Keywords : Sand polymers;Metal alloys
Abstract : CR-39 films have been used for evaluation of neutron shielding of metal alloys, different types of rubbers, sand polymers, etc. These films have been chosen because of their ability to record fast neutrons from 200 keV-10 MeV and their insensitivity to gamma radiations. Tenth value layer (TVL) for the materials studied varies from 10.5 to 28.6 cm. In addition, the values of TVL have also been computed for standard material, such as Al, steel, etc. Using neutron removal cross-section data, the results have been compared with those of experimentally determined values. The results seem to be in agreement within approximate 10 per cent variation.
| || Interpolation technique in computed tomography image visualisation
Author : Tripathi, Asha ;Khatri, P.K. ;Baheti, G.L. ;Songara, K.C.
Source : Defence Science Journal ; Vol:52(3) ; 2001 ; pp 317-324
Subject : 621.396.9 Radars
Keywords : Computed Tomography ;Image Visualisation;CT images
Abstract : An interpolation technique has been developed for generation of enlarged dataset from a limited one-dimesional acquired dataset for improving the image quality in quick-scan tomography. The effectiveness of the technique has been tested using data acquired from the first-generation. The CT images generated using this technique have been compared with the CT images generated from the acquired dataset for the same number of projections. The image quality has been improved on account of (i) enhancement of features, (ii) reduction in reconstruction artifacts, and (iii) magnification of the image without pixelisation.