PHOTON CROSS SECTION COMPILATION ACTIVITY IN THE U. S. IN THE RANGE 1 keV TO 100 GeV
Résumé
A brief survey will be presented of photon cross section (attenuation coefficient) measurements available over the range of photon energies 10 eV to 100 GeV and elements Z = 1 to 100. The results of these measurements, extracted from the 1909-1970 literature, are on file at the NSRDS (National Standard Reference Data Center) « X-Ray Attenuation Coefficient Information Center » at the NBS. These data, plus newly-available theoretical values for photoabsorption, scattering and pair-production cross sections, are the subject of continuing evaluation and compilation programs at the NBS, LRL (Lawrence Radiation Laboratory, Livermore) and elsewhere. Present compilation efforts by NBS (10 keV-100 GeV, 23 elements) and by LRL-NBS (1 keV- 1 MeV, 87 elements) will be described and compared with input information. Compilation uncertainties from Z-interpolation and absorption-edge fine-structure will be discussed.
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