structure of zircon is ZrSiO4 with the major elemental compositions are Zr, Si and O. However, we need to know chemical composition in oxide form for theoretical calculation of gamma rays interaction parameters. The chemical compositions in oxide form of the zircons in this work were analyzed with Energy Dispersive X-rays Fluorescence Spectrometer (EDXRF, Minipal-4) and the results are shown inTable 1. The results show significantly different in the ZrO2major composition and SiO2 minor composition between the zircons of different origin.