X-radiation for diffraction measurements is produced by a sealed tube or rotating anode
• Sealed X-ray tubes tend to operate at 1.8 to 3 kW.
• Rotating anode X-ray tubes produce much more flux because they operate at 9 to 18 kW. –A rotating anode spins the anode at 6000 rpm, helping to distribute heat over a larger area and therefore allowing the tube to be run at higher power without melting the target. • Both sources generate X rays by striking the anode target wth an electron beam from a tungsten filament. –The target must be water cooled.
–The target and filament must be contained in a vacuum.
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