The quantitative electron density at the focusing surface on the anode of an X-ray tube (10 kW, line focus type) is measured using an ordinary X-ray pinhole-camera with the aid of the relation between X-ray intensity and the blackness of X-ray image on film.
It is found that the electron density
J(mA/mm
2) can be calculated by
J=
X/
DI, where
D stands for total. X-ray intensity due to total focused surface,
X for X-ray intensity due to an arbitrary point on the same surface and
I for current of X-ray tube.
An X-ray film was divided into several parts, and one part is used for obtaining the blackness vs. X-ray intensity relation, and the other parts are used for taking pinhole-photographs under various focusing conditions. All photographs were developed simultaneously so as to exclude error. Microphotometer is used to obtain point to point X-ray intensity on the focusing surface with the aid of the blackness vs. X-ray intensity relation.
From these measurements a conclusion is arrived at that the input wattage at any point on the focusing surface on anode is, within the normal range, namely the saturated range expressed by the multiplication of tube voltage and tube current at that point, because the trajectory of elelectrons emitted from cathode of the X-ray tube is unrelated to the variation in the tube current and tube voltage.
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