METHOD FOR MEASURING THICKNESS OF MULTI-LAYER LAMINATED MATERIAL
PURPOSE:To measure the thickness of each material layer with good accuracy by determining each total thickness of the same kind of the material layers as the solution of the simultaneous equation of the 1st equation obtd. by irradiating X-rays or gamma-rays and the 2nd equation obtd. by irradiating...
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Zusammenfassung: | PURPOSE:To measure the thickness of each material layer with good accuracy by determining each total thickness of the same kind of the material layers as the solution of the simultaneous equation of the 1st equation obtd. by irradiating X-rays or gamma-rays and the 2nd equation obtd. by irradiating neutron rays. CONSTITUTION:Each total thickness is determined as the solution of the simultaneous equation for radiation transmission characteristics of the equation (1) of (1)' obtd. by irradiating X-rays or gamma-rays to the multi-layer laminated material 1 constituted of two kinds of the material layers and the equation (2) obtd. by irradiating neutron rays thereto. Here, mumx,j, mumr,j, mumn,j (j=1, 2); the mass absorption coefft. of the j-th material relating to the X-rays (x), gamma-rays (gamma) or neutron rays n. rhoj (j=1, 2); the density of the materials 1, 2. tj (j=1, 2); the total thickness of the layers of the materials 1, 2. Iox, Ioj, Ion, Itx, Itj, Itn; the radiation doses before and after transmission of the X-rays (X), gamma ray (gamma) or neutron rays (n)n. The thickness of each material layer is thus determined with good accuracy. |
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