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The optical spectrum band positions and spin-Hamiltonian (SH) parameters (g factors g(vertical bar) and g(perpendicular to) and hyperfine structure constants A(vertical bar) and A(perpendicular to)) for 5f(1) ion Pa(4+) at the tetragonal Th(4+) site of ThX(4) (X=Cl, Br) crystals are calculated from a complete diagonalization (of energy matrix) method (CDM). In the CDM, the magnetic (or Zeeman) interaction and hyperfine interaction terms are added to the Hamiltonian in the conventional CDM and so the optical and EPR spectra data can be studied in a unified way. The calculated results are in reasonable agreement with experimental values. The possible misprints or small errors in the experimental g factors for Pa(4+) in ThX(4) crystals are pointed out. The results are discussed. (c) 2010 Elsevier B.V. All rights reserved.