| 主权项 |
1. An X-ray source comprising:
an elongate tubular housing adapted to be fitted into a port of and extend into a chamber containing a sample to be analysed, said housing containing:
an electron gun and a target mounted in the housing, the electron gun being arranged to direct electrons to a point on the target such that the target radiates X-rays; anda monochromator arranged to focus X-rays radiated from the target to a focal point on a sample in the chamber; wherein the tubular housing has an inner diameter (D) and a central axis along its length, and wherein the monochromator is positioned, and comprises a material selected such that the focal point of the X-rays on the sample lies at a radial distance from the central axis not greater than the radius (D/2) of the housing, and wherein the point on the target is also at a radial distance from the central axis not greater than the radius of the housing, such that the target, the monochromator and the focal point on the sample are all contained within a radial area not greater than the diameter of the housing. |
