Experimentally Measured Total X-Ray Attenuation Coefficients Extracted from Previously Unprocessed Documents Held by the NIST Photon and Charged Particle Data Center. II. September 2004

摘要

This report is a sequel to report NISTIR 5892 (1996), and similarly lists, annotates and extracts data from the papers which have come into the NIST Photon and Charged Particle Data Center (PCPDC), or have been identified as containing data previously omitted from the data base, since the completion of that report. This report, in the same format as its predecessor, lists and annotates 23 previously unprocessed original-source documents held by the NIST Photon and Charged Particle Data Center (PCPDC), containing experimentally measured absolute values of the mass attenuation coefficient, or total photon interaction cross section for one or more elemental materials. The data from these further documents had not been previously extracted for purposes of entering into the PCPDC x-ray attenuation measurement data base. Tables of the extracted data, are included in this report, with all photon energies converted to multiples of eV (electron volts), and all photon cross sections converted to units of barns per atom. In some cases, photon wavelengths in A (angstroms) or nm (nanometers) are given in the source documents instead of photon energies, in which case the reciprocal conversion to photon energies (in eV) was performed. Thus these additional experimental data sets are in a standard-format machine-readable form, amenable to incorporating into the NIST/PCPDC measured photon cross section data base. A total of 3357 data points, for 48 elements from B(Z=5) to U(Z=92), and for photon energies ranging from 44.9 eV to 161.92 MeV were extracted and are presented.