Abstract
Some reports have been published on Xeroradiography, in which Xerography or Electrofax was not promising in the radiography because of its lower sensitivity than that of the usual photography.
We tried some experimental studies on the phosphor sensitization of the zinc oxide in order that we may apply the Electrofax for the radiography.
At a value of X-ray intensity (25 kV, 8 mA), the ratio of the photocurrent to the dark current of the zinc oxide only was given by 8.5. On the other side, the phosphor sensitization improved this ratio as follows:
| Photoconductor | Phosphors | Photocurrent/dark current |
|---|
| ZnO | ……… | 8.5 |
| ZnO+Rose Bengale | ZnS (Cu, Al) | 380 |
| ZnO | BaSO4(Pb) | 2400 |
The sensitive plates used in the experiments were made as sandwich type which a thin sheet of phosphors was inserted between a photoconductor layer and a base material. X-ray is irradiated onto the surface of the photoconductor and excites the phosphor thrgugh the photoconductor layer.
The radiation produced from the phosphor also sensitizes the photoconductor.
