Scanning Proton-Induced X-ray Microspectrometry in an Atmospheric Environment.
Collimated million-electron-volt proton beams, brought out into air, can be used as a scanning microprobe to examine specimens with a spatial resolution of the order of 1 micrometer. Trace elements at concentrations as low as 1 part per million can be detected. Some preliminary results based on the use of this simple method are presented.
Horowitz
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Grodzins
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