What is the difference in EDS and EMS?

EDS (Energy Dispersive Spectroscopy) and EMS (Energy-Dispersive X-ray Spectroscopy) are often used interchangeably, but they can refer to slightly different contexts. EDS typically focuses on the analysis of elemental composition in materials by detecting X-rays emitted from a sample when it is bombarded with an electron beam. EMS can sometimes refer to the broader techniques involving energy dispersive methods, including EDS but also potentially other forms of energy analysis. In practice, EDS is the more commonly used term in materials science and electron microscopy.