The Vx Spectra surface multiphase flowmeter measures at a single point at high frequency to ensure precise, repeatable flow rates for any multiphase flow condition independent of flow regime variation. Current nuclear systems rely on empirical correlation to correctly allocate photons into the dual energy levels. The Vx Spectra flowmeter is the only multiphase metering technology that uses full gamma spectroscopy to truly measure the photons and all energy levels of the gamma source spectrum, providing the most accurate oil, gas, and water flow rate measurements in the industry.