上海充通大兽 X-ray Sources SHANGHAI JIAO TONG UNIVERSITY water The standard X-ray tube(top right)was developed by Coolidge (at GE)around X-rays anode 1912. It is desirable to produce the maximum electrons intensity of x-rays;a Cu target tube might be able to deliver 2 kW.The limiting cathode factor is the heat that the target (anode) Filament can handle;cold water is used to remove heat. Higher power can be delivered by rotating anode dissipating the heat over a larger volume, water with a rotating anode (bottom right). in out However,this is not normally used for XRF. X-rays X-rays Power in watts current [amps]x electrons voltage [volts] cathode FilamentX-ray Sources The standard X-ray tube (top right) was developed by Coolidge (at GE) around 1912. It is desirable to produce the maximum intensity of x-rays; a Cu target tube might be able to deliver 2 kW. The limiting factor is the heat that the target (anode) can handle; cold water is used to remove heat. Higher power can be delivered by dissipating the heat over a larger volume, with a rotating anode (bottom right). However, this is not normally used for XRF. * Power in watts = current [amps] x voltage [volts]