MOLECULAR DIFFERENTIAL CROSS-SECTIONS FOR X-RAY COHERENT SCATTERING IN FAT AND POLYMETHYL METHACRYLATE

Molecular differential cross sections for the coherent scattering of x -rays in polymethyl methacrylate (PMMA) and fat were determined from m easured diffraction patterns in the interval chi = 0 to 6.4 nm(-1) (ch i = [sin(theta/2)]/lambda; lambda being the incident wavelength having the units of nm and theta the scattering angle). All measurements wer e performed at a controlled temperature of 23 degrees C. The final res ults for PMMA show overall agreement when compared with the data exist ing in the literature. However, some discrepancies with the results re ported by Kosanetzky et al in 1987 are found at the first three maxima . The data for filtered fat material are reported here for the first t ime. Finally, data sets of molecular form factors for fat and PMMA wer e compiled from the smoothed corrected experimental results by assumin g these materials to be mono-molecular.