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The solution is in the form of two thin disks of industrial sapphire, molecularly fused, with a thin layer of inscribed platinum. The disks were immersed in acid to test their durability and to simulate aging.
With the sapphire disk, up to 40,000 miniaturized pages of text or images etched can be inscribed in the platinum. The information would be read with microscope.
A key application would be as a solution for how future societies will be able to identify areas of buried nuclear waste. Nuclear reactors produce radioactive waste that needs to be safely stored for up to one million years. Once a disposal method is determined, future societies will need to know where the waste is buried. According to Science magazine. Finland, France, and Sweden are the furthest advanced in the process of finding a geologically suitable site. While designers of such repositories are confident the waste can be buried safely, the fear is that future archaeologists may dig in t he wrong places. Markers would be a way to allow them to know the sites where they should not dig.
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