The base of a tube which is attached to a X-ray tube vessel of X-ray apparatus used for medical treatment, are covered with wood or Bakelite. The present author found that to use a sheet of Aluminum is more effective.
It is believed, heretofore, that X-ray doses which are radiated from the one peace-full (half) wave rectification apparatus are not regular, even though the product of a X-ray tube voltage peak value or X-ray tube current mean value, and radiation time is identical, unless each wave is identical. The present author reports as follows. Supposing that a voltage wave is a sine wave and a current wave is trapezoid wave with an optional saturation angle, in the same apparatus, a X-ray tube current saturation angle changes only by the relative relation of each wave peak value of tube voltage and tube current. From the fact, the author indicates the quantity of beam by a saturation angle function and gets the quantitative relation with it.
By adding a little improvemen to a Indirect Radiography aparatus heretofore in use, the apparatus can be operated in two ways, that is, 35 mm indirect radiography and observing an enlarged photograph. The present author reports the method.
Cu 0.05-0.2mm has been used for a compensation filter so far. It is, however, difficult to get one which has a suitable thickness. The present author used the mixture of handy Aluminum, Barium clay, and oil, and mixed filter of bismuth and ointment for it. He reports the result when it is used for radiographing a pleura.