Patent Number: 
Section: claims

1. A method for generating an X-ray, comprising the steps of:irradiating an energy beam onto a target from an energy beam source, thereby generating an X-ray with an irradiating area to be irradiated onto an object; andintroducing said X-ray into a spectrometer including a first reflective crystal plate and a second reflective crystal plate which are subsequently arranged at a relative angle twice as large as an incident angle of said X-ray onto said first reflective crystal plate, thereby generating an X-ray with parallelism through the selection of wavelength and wavelength range. 2. The generating method as defined in claim 1, wherein said first reflective crystal plate and said second reflective crystal plate are made of a material selected from the group consisting of silicon, lithium fluoride (LiF), graphite, germanium and quartz. 3. The generating method as defined in claim 1, further comprising the step of, before introducing said X-ray into said spectrometer, transmitting said X-ray through at least one of an absorptive plate and a slit so as to remove components with unnecessary wavelength of said X-ray. 4. The generating method as defined in claim 3, wherein said absorptive plate is an aluminum plate. 5. The generating method as defined in claim 1, wherein said target is a stationary type target. 6. The generating method as defined in claim 1, wherein said energy beam source is an electron beam source so that said energy beam can be an electron beam. 7. The generating method as defined in claim 6, wherein said electron beam source is a diode or a triode type electron beam source. 8. The generating method as defined in claim 1, wherein said X-ray with parallelism is usable for medical use. 9. An apparatus for generating an X-ray, comprising:a target for generating an X-ray through the irradiation of an energy beam;an energy beam source for generating said energy beam to generate said X-ray so as to have an irradiating area to be irradiated onto an object; anda spectrometer for selecting wavelength and wavelength range of said X-ray through the introduction of said X-ray so as to generate an X-ray with parallelism from said X-ray,wherein said spectrometer includes a first reflective crystal plate and a second reflective crystal plate which are subsequently arranged at a relative angle twice as large as an incident angle of said X-ray onto said first reflective crystal plate. 10. The generating apparatus as defined in claim 9, wherein said first reflective crystal plate and said second reflective crystal plate are made of a material selected from the group consisting of silicon, lithium fluoride (LiF), graphite, germanium and quartz. 11. The generating apparatus as defined in claim 9, further comprising at least one of an absorptive plate and a slit so as to remove components with unnecessary wavelength of said X-ray by transmitting said X-ray through said at least one before said X-ray is introduced into said spectrometer. 12. The generating apparatus as defined in claim 11, wherein said absorptive plate is an aluminum plate. 13. The generating apparatus as defined in claim 9, wherein said energy beam source is an electron beam source so that said energy beam can be an electron beam. 14. The generating apparatus as defined in claim 13, wherein said electron beam source is a diode or a triode type electron beam source. 15. The generating apparatus as defined in claim 9, wherein said X-ray with parallelism is usable for medical use. 16. A method for generating an X-ray, comprising the steps of:irradiating an energy beam onto a target from an energy beam source, thereby generating an X-ray with an irradiating area to be irradiated onto an object; andintroducing said X-ray into a spectrometer including a first transmission crystal plate, a second reflective crystal plate and a third transmission crystal plate, which are subsequently arranged so that a reflection plane of said second crystal plate is perpendicular to reflection planes of said first crystal plate and third crystal plate, thereby generating an X-ray with parallelism through the selection of wavelength and wavelength range. 17. The generating method as defined in claim 16, wherein said first reflective crystal plate, said second transmission crystal plate and said third reflective crystal plate are made of a material selected from the group consisting of silicon, lithium fluoride (LiF), graphite, germanium and quartz. 18. The generating method as defined in claim 16, further comprising the step of, before introducing said X-ray into said spectrometer, transmitting said X-ray through at least one of an absorptive plate and a slit so as to remove components with unnecessary wavelength of said X-ray. 19. The generating method as defined in claim 18, wherein said absorptive plate is an aluminum plate. 20. The generating method as defined in claim 16, wherein said target is a stationary type target. 21. The generating method as defined in claim 16, wherein said energy beam source is an electron beam source so that said energy beam can be an electron beam. 22. The generating method as defined in claim 21, wherein said electron beam source is a diode or a triode type electron beam source. 23. The generating method as defined in claim 16, wherein said X-ray with parallelism is usable for medical use. 24. An apparatus for generating an X-ray, comprising:a target for generating an X-ray through the irradiation of an energy beam;an energy beam source for generating said energy beam to generate said X-ray so as to have an irradiating area to be irradiated onto an object; anda spectrometer for selecting wavelength and wavelength range of said X-ray through the introduction of said X-ray so as to generate an X-ray with parallelism from said X-ray, said spectrometer including a first transmission crystal plate, a second reflective crystal plate and a third transmission crystal plate which are subsequently arranged so that a reflection plane of said second crystal plate is perpendicular to reflection planes of said first crystal plate and said third crystal plate. 25. The generating apparatus as defined in claim 24, wherein said first reflective crystal plate, said second transmission crystal plate and said third reflective crystal plate are made of a material selected from the group consisting of silicon, lithium fluoride (LiF), graphite, germanium and quartz. 26. The generating apparatus as defined in claim 24, further comprising at least one of an absorptive plate and a slit so as to remove components with unnecessary wavelength of said X-ray by transmitting said X-ray through said at least one before said X-ray is introduced into said spectrometer. 27. The generating apparatus as defined in claim 26, wherein said absorptive plate is an aluminum plate. 28. The generating apparatus as defined in claim 24, wherein said energy beam source is an electron beam source so that said energy beam can be an electron beam. 29. The generating apparatus as defined in claim 28, wherein said electron beam source is a diode or triode type electron beam source. 30. The generating apparatus as defined in claim 24, wherein said X-ray with parallelism is usable for medical use.