摘要: X-ray Fluorescence (XRF) and neutron activation analysis (NAA) are the two main non-invasive methods for in vivo vitro element analysis. XRF is emission of fluorescent x-rays from a material that has been bombarded with gamma rays. This article describes technology measurement. Keywords: x-ray fluorescence (XRF); neutron (NAA); in analysis; XRF technology; in measurement