Monitor of an X-ray radiation range

Claim 1

A monitor of an X-ray radiation range for use in a fluorescent X-ray analyzer, said monitor comprising: an X-ray source for radiating X-rays on a sample to be irradiated; a collimator arranged along an axis of said X-rays so as to collimate said X-rays; a mirror which is permeable to said X-rays but which reflects visible rays, said mirror being arranged across said axis of said X-rays between said collimator and said X-ray source; a visible ray source arranged so as to radiate visible rays which are reflected by said mirror and then pass through said collimator so as to irradiate said sample, said visible rays being irradiated simultaneously with said X-rays; a fluorescence detector for detecting fluorescence X-rays emitted from said sample in response to said X-rays radiated thereon by said X-ray source; an optical viewer arranged so as to view a point on said sample upon which said X-rays impinge; wherein said mirror is inclined at an angle with respect to said X-ray axis so that an axis of said visible rays is substantially identical to said axis of said X-rays radiated by said X-rays source, whereby said point on said sample upon which said X-rays impinge is substantially identical to a point on said sample upon which said visible rays impinge and said point is simultaneously irradiated with both said X-rays from said X-ray source and said visible rays from said visible ray source.