To be able to achieve further small-sized formation and light-weighted
formation and to promote a sensitivity by further efficiently detecting a
fluorescent X-ray or the like in an X-ray tube and an X-ray analyzing
apparatus, there are provided a vacuum cabinet 2 inside of which is
brought into a vacuum state and which includes a window portion 1 formed
by an X-ray transmitting film through which an X-ray can be transmitted,
an electron beam source 3 installed at inside of the vacuum cabinet 2 for
emitting an electron beam e, a target T generating a primary X-ray X1 by
being irradiated with the electron beam e and installed at inside of the
vacuum cabinet 2 to be able to emit the primary X-ray X1 to an outside
sample S by way of the window portion 1, and an X-ray detecting element 4
arranged at inside of the vacuum cabinet 2 to be able to detect a
fluorescent X-ray and a scattered X-ray X2 emitted from the sample S and
incident from the window portion 1 for outputting a signal including
energy information of the fluorescent X-ray and the scattered X-ray X2.