連続X線に関する等価ファントームの線吸収係数の実験公式

抄録

The formula is presented to obtain the absorption coefficient of the continuous X-rays for several phantoms. They are found experimentaly to have the same μ values as the portions of human body. The μ values depend on the followings ; flux area, phantom thickness, voltage, current and time. The formula is μ_2=A (λ^n+B), A=a・i_β・exp (-mx), where λ(Å) is the wave length of X-rays used, a, B, and n are the constant values for the portion of human body, i_β is the correction factor for current, and exp (-mx) is the term depends on the phantom thickness. This formula is extended from the formula reported previously. The values of these constant are obtained experimentaly and listed in the tables. Using this formula, the μ values of the portion of human body tested and I_0 (=λis) (mR) are calculated, and then, the exposure time s sec can be estimated easily. The results obtained are satisfactory for the practical cases. In this paper, the procedure to get the formula and the values of constants are reported. The formula is presented to obtain the absorption coefficient μ of the continuous X-rays for several phantoms whose μ values are the same as the portions of human body.