Sommai Changkian and Puangtip Kaewtubtim

pp. 117 - 122

Abstract

A study of the evolution of element, crystal structure and thermoluminescence signal versus gamma irradiation dose were carried out for calcite shells samples. The composition of element was studied by X-ray fluorescence spectrometer. As identified by X-ray diffraction and SEM/EDS analysis, two polymorphs of calcium-carbonate were extracted: calcite and aragonite. The evolution of TL signal versus gamma irradia­ tion dose using the TL reader (Harshaw 2000) was initially dependent on crystal structure and fading effect of the thermoluminescence signal .