Absorption Coefficients for Homogeneous X-Rays

E. G. Taylor
1922 Physical Review  
Absorption Coefficients of Various Organic Liquids for X-rays of Wave-length 0.715 A.-By means of a spectrometer with narrow lead slits and a calcite crystal, the K a radiation from the Mo target of a Coolidge tube was reflected into an ionization chamber, and the effect of interposing a cell containing a known thickness of liquid before the first slit, was measured. Thus absorption coefficients were determined for carefully purified samples of pinene (C10H16), Umonene (CioHie), benzene (CeHe),
more » ... e), benzene (CeHe), toluol (C7H8), isopropyl alcohol (C3H8O), methyl proprionate (C4H8O2), ethyl acetate (C4H&O2), acetone (C3H6O), ethyl formate (C3H6O2) and trimethylene glycol (C 3 H 3 0 2 ). Atomic absorption coefficients for C, H, and O for X-rays of wave-length 0.715 A. were computed from the above data, assuming absorption to be an additive atomic property, and came out from 11.00 to 11.55 X io~2 4 for C, 0.45 to 0.50 X io~2 4 for H and 29.9 to 31.0 X io~2 4 for 0. Using the mean values, the computed coefficients are within f per cent, of the observations, on the average. But the fact that the computed values for acetone and water are 1 per cent, too low suggests that the assumption that absorption is an atomic property may not be accurately true.
doi:10.1103/physrev.20.709 fatcat:aoh4rfzzmzbjnjtjwvbrx52dky