Detector used in this work is the NaI (Tl) scintillation detector with Crystal diameter 76 * 76 mm, the thickness of the aluminum window is 1.5 mm, the thickness of Silicon is 2 mm are manufactured by Amptek Ltd. co. USA. The software records and analyzes the spectrum used is the Genie software 2 k. The source used here is the point source is manufactured by Eckert & Ziegler 1μCi activity. Wrong number of source activity under 3%. The source is placed in the position of 25 cm how surface probes. The sources noted that the time for peak energy in each area is under 3%.2.2. Research methodThe method of transmission (transmission method) is given by N. H Cutshall and Associates (1983) based on the principle of gamma ray attenuation when a line through the material, depending on each detector. When gamma rays go on the inside of the material occurs the interactive process as: photovoltaics, compton scattering, the created folder, so when the physical layer via a chain, gamma beam's intensity decreased. The experiment shows that the attenuation of gamma beam intensity depends on the thickness and material, are presented according to the formula 1
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