The production cross sections of Be-10 and Al-26 were measured by accelerator mass spectrometry using Y-89, Tb-159, and Cu-nat targets bombarded by protons with energies E-p of 120 GeV and 392 MeV. The production cross sections obtained for Be-10 and Al-26 were compared with those previously reported using E-p = 50 MeV-24 GeV and various targets. It was found that the production cross sections of Be-10 monotonically increased with increasing target mass number when the proton energy was greater than a few GeV. On the other hand, it was also found that the production cross sections of Be-10 decreased as the target mass number increased from that of carbon to those near the mass numbers of nickel and zinc when the proton energy was below approximately 1 GeV. They also increased as the target mass number increased from near those of nickel and zinc to that of bismuth, in the same proton energy range. Similar results were observed in the production cross sections of Al-26, though the absolute values were quite different between Be-10 and Al-26. The difference between these production cross sections may depend on the impact parameter (nuclear radius) and/or the target nucleus stiffness. (C) 2015 Elsevier B.V. All rights reserved.