| 摘要 |
PURPOSE:To analyze the composition and structure of a body quantitatively and nondestructively with high accuracy by passing an X-ray beam through a body through a filter and finding the logarithmic value of the ratio of the radiation quantity of an X-ray beam which is not passed through the body. CONSTITUTION:One of X-ray beams from an X-ray tube 1 which have long- wavelength and short-wavelength components cut by the filter 2 is passed through an aperture of a shield plate 14 and transmitted through the body M to be discriminated on a shield plate 4 and a hole 5, and an X-ray sensor 6 measures the radiation quantity A of the X ray. Further, the other X-ray beam is passed through a hole 5' of the shield plate 4 without any disturbance and an X-ray sensor 6' measures the X-ray radiation quantity; and a logarithmic calculating circuit 7 calculates the logarithmic value of the ratio of their X-ray radiation quantities. Then the thickness of the object body M is measured by a means 8 such as a micrometer and a matching circuit 12 reads an inclination value corresponding to an X-ray tube voltage out of a data storage circuit 11 and retrieves the body composition corresponding to the inclination, thereby displaying the discrimination result. |
