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Experimental results are presented comparing the intensity of thebremsstrahlung produced by electrons with initial energies ranging from 10 to20-keV incident on a thick Ag target, measured at forward angles in the range 0degrees to 55 degrees. When the data are corrected for attenuation due tophoton absorption within the target, the results indicate that the detectedradiation is distributed anisotropically only at photon energies, k, that areapproximately equal to the initial energy of the incident electrons, Eo. Theresults of our experiments suggest that as k /Eo goes to 0, the detectedradiation becomes essentially isotropic due primarily to the scattering ofelectrons within the target. A comparison to the theoretical work of Kissel etal. [At. Data Nucl. Data Tables 28, 381 (1983)] suggests that the angulardistribution of bremsstrahlung emitted by electrons incident on thick targetsis similar to the angular distribution of bremsstrahlung emitted by electronsincident on free-atom targets only when k /Eo is approximately equal to 1. Theexperimental data are also in approximate agreement with the angulardistribution predictions of the Monte Carlo program, PENELOPE.

Angular distribution of thick-target bremsstrahlung produced by electrons with initial energies ranging from 10 to 20-keV incident on Ag