X-ray fluorograph and radiograph apparatus for obtaining X-ray image having high X-ray latitude

An X-ray fluorograph and radiograph apparatus comprising:

• (a) an X-ray generator;
• (b) a means for controlling generation of X-rays;
• (c) a means for converting an X-ray image into a light image;
• (d) a television camera including an avalanche multiplication operation type image pick-up tube, and having a non-linear input/output relation in which an increment of an output with respect to an increment of an input of light intensity is controlled so as to reduce gradually with an increasing input light intensity, and having said light image inputted thereto;
• (e) a means for setting a radiograph condition;
• and
• (f) a means for controlling said input/output relation of said image pick-up tube on a basis of a set radiographic condition.