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r />Thin beryllium foils are used as radiation windows for X-ray detectors, and their extremely low absorption minimizes the heating effects attributable to excessive-intensity, low power X-rays typical of synchrotron radiation. Beryllium was used for cantilevers in excessive-efficiency phonograph cartridge styli, where its excessive stiffness and low density allowed for monitoring weights to be diminished to 1 gram while nonetheless tracking excessive frequency passages with minimal distort

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