| 摘要 |
PURPOSE:To prevent the degradation in image quality by mixing plural accumulation type fluorescent materials which are different in the response speed of stimulated luminous light to stimulating light and the radiation absorption characteristics indicat ing the absorptivity to the respective energies of radiations or disposing the same in the form of layers. CONSTITUTION:The accumulation type fluorescent material sheet 14 is formed with the 1st accumulation type fluorescent material layer consisting of CdOCl:Ce<3+> which is large in absorption of the high energy component of X-rays 12 and is high in the response speed and the 2nd accumulation type fluorescent material layer consisting of SrFCl:Eu<2+> which is small in the absorption of the high energy component of the X-rays 12 and is low in the response speed in this order on a sheet material which is a base. The high energy component in an X-ray photographic apparatus 10 is, there fore, strongly absorbed in the CdOCl:Ce<3+> and energy accumulation is effected. The low energy component is absorbed in the SrFCl:Eu<2+> and the energy accumulation is effected. The stimulated luminous light 22 is read at the timing different from each other to obtain image signals. The good images are obtd. on the accumulation type fluorescent material sheet by executing the photographing just once and executing the reading just once as well. |
