Researchers unveil a more accurate pressure scale using advanced x-rays, revealing Earth's inner core has twice the light material previously estimated. Their methodology provides an easier path for future pressure measurements. In research published on September 8 in the journal Science Advances
A new pressure scale was determined using advanced x-rays at RIKEN’s SPring-8 Center. The old scale was found to overestimate pressure by 20% at levels found in Earth’s core. This new scale’s implications are vast, with revelations that the inner core has about double the light material previously thought.Researchers unveil a more accurate pressure scale using advanced x-rays, revealing Earth’s inner core has twice the light material previously estimated.
When the new scale was used to interpret the seismological model, the team found that the amount of light material in the inner core was about double what was previously expected, and indeed the total mass of light material in the entire core is probably five times, or more, that of the Earth’s crust – the layer that we live on.In the new work, the team, led by Alfred Q.R.
They determined both compressional/longitudinal and shear/transverse sound velocities, and the density of the rhenium. That allowed the researchers to determine the pressure that the rhenium was subjected to.The new study provides a direct relationship between rhenium density and pressure. Baron says, “The density of rhenium at high pressure is straightforward and fast to measure, and there are many facilities worldwide where such measurements can be made.
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