| 摘要 |
When laser beams with a wavelength of 9.3 mum or 9.6 mum are used, a pulse width t (musec) which is a radiation time of the laser beam and an energy density E (kw/cm<SUP>2</SUP>) of the laser beam on an X-ray film are set such that they meet requirements based on an area A between line segments A<SUB>1 </SUB>and A<SUB>2</SUB>. Moreover, when laser beams with a wavelength of a 10-micrometer band, such as 10.6 mum, is used, the pulse width and the energy density are set such that they meet requirements based on an area B between line segments B<SUB>1 </SUB>and B<SUB>2</SUB>. As a result, since the pulse width t is within a range of equal to or larger than 3 musec and smaller than 30 musec, a high-quality marking pattern with excellent visibility can be formed while improving the productivity of the X-ray film.
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