Browsing by Author "Mashauri, Christian Daudi"

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    Total Photon Interaction cross-section measurements for some selected elements at 22,2,,59,6 and 88,8 keV
    (University of Dar es Salaam, 1984) Mashauri, Christian Daudi
    The total proton interaction cross-sections for the elements A2 (Z=13), Cu, Zn, Cd, In and Sn (29
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    Total photon interaction cross-section measurements for some selected elements at 22.2, 59.6 and 88.8 kev.
    (University of Dar es Salaam, 1984) Mashauri, Christian Daudi
    The total photon interation cross-sections for the elements A& (Z = 13), Cu, Zn, Cd, In and Sn (29 ≤ 50) at photon energies 22.2, 59.6 and 88.8 keV have been measured. The measurements for Cd and In at these energies have been carried out for the first time. The corresponding photoelectrict cross-sections have been deduced from these measurements and are found to be in good agreement with their corresponding theoretical values available in the literature. For our measurements a good geometry set up was designed and used which, once set, remained fixed. It could be disturbed and reset for a new run. The detector system used consisted of a liquid- nitrogen-cooled X-ray HPGe detector with effective area 0.5 〖cm〗^2, crystal thickness 0.5 cm and be window 2 mil thick (resolution approximately 188 Ev at 5.9 keV of Mn K_a-line). The absorbers used were spectroscopically pure, (99.9%). For our use we machined them into circular shapes each with a uniform thickness. The pulses from the detector, after shaping and proper amplification, were fed to a CANBERRA MCA model 8100 with 1096 channels, where the final spectra were recorded during a preset collection time. The collected counts were later on corrected for background countings and the analysis was done with great precision.