Pd 3d5/2 binding energy values [1].
A) Doublet separation Pd 3d5/2 - Pd 3d3/2 = 5.31 +/- 0.12 eV (8 Cit.).
[2] specifies a doublet separation of 5.26 eV.

B) PdO is reduced relatively rapidly by X-rays. Take steps to minimize X-ray exposure during acquisition.

C) Some references quote B.E. values for PdO2, however PdO is the only well characterized oxide of palladium. 

[1] C.D. Wagner, A.V. Naumkin, A. Kraut-Vass, J.W. Allison, C.J. Powell, J.R.Jr. Rumble, NIST
Standard Reference Database 20, Version 3.4 (web version) (http:/ 2003.
[2] J.F. Moulder, W.F. Stickle, P.E. Sobol, K.D. Bomben, Handbook of X-ray Photoelectron Spectroscopy, Perkin-Elmer Corp., Eden Prairie, MN, 1992.