| 摘要 |
PURPOSE: To simplify description and photocopy of required data to a base material and an X-ray photograph by pressurizing an ink chamber filled with X-ray shielding ink containing a specific single substance or compound dispersed in a solvent, and writing with it. CONSTITUTION: An X-ray shielding ink composition 3 filled in an ink chamber contains a single substance or compound having an X-ray absorption coefficient of 10% or more of that of lead and dispersed in a solvent. Since a pigment such as a white lead, barium sulfate, cadmium yellow, chrome yellow, cadmium red, vermilion, Naples yellow, tungsten blue or the like or tungsten carbonate, tungsten of the X-ray shielding agents is easily obtainable as fine powder, it is suitably used. To write on a base material, a pressure valve 5 is compressed while blocking an air hole 6 of the valve 5 by a finger to pressurize the valve. Then, its valve disc 11 is released from a valve seat 8 against a spring 10, thereby pressurizing the composition 3 in the chamber 2. Hence, the composition 3 is adhered to a ballpoint pen tip 13 at its end to form a handwriting by its rotation. |
