Abstract
The formula is reported to obtain the absorption coefficients of the continuous X-rays for several phantoms, using two kinds of grid. The equation of the formula is the same as that reported previously. μ_2=A (λ^n+B) ; A=ai exp (-mx) The constants a, B and m in this equation are obtained experimentaly using four kinds of phantoms and two kinds of grid When the grid is used, the constants a and exp (-mx) are obtained larger than those without grid, that is, the correction factors for sample thickness are estimated larger. In the practical application using these constants, the exposure time s (sec) is easily obtained from I_0 (=λ is) (mR) for I (mR)=1,and the desities of the photographs obtained are satisfactory. The experimental procedure to obtain these constants and their results are reported in this paper.
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