Uranium Soft X‐Ray total Attenuation Coefficients

Uranium total attenuation coefficients were measured continuously from 0.84 to 6.0 keV and at selected higher energies using a vacuum single crystal diffractometer and flow‐proportional counter. Statistical fluctuations ranged from 0.5% to 2%. The overall accuracy was 3%. Prominent structure was measured within 20 eV of the M₅ (3.552 keV) and M₄ (3.728 keV) edges. Jump ratios were determined from log‐log polynomial fits to data at energies apart from the near‐edge regions. These data were compared with calculations based on a relativistic HFS central potential model and with previously tabulated data.