X-ray
A form of electromagnetic radiation with wavelengths shorter than ultraviolet light. Its penetrating properties are used in medical imaging, security screening, and materials analysis.
In 2008, UCLA showed in Nature that peeling Scotch tape in a vacuum emits nanosecond X-ray bursts. The tape's adhesive side charges positive, outer side negative — a ~40,000 V gap. Accelerated electrons strike across and emit X-rays. They photographed finger bones with it.
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