  Transition frequencies were determined for transitions in Ra in an atomic
beam and for reference lines in Te$_2$ molecules in a vapor cell. The absolute
frequencies were calibrated against a GPS stabilized Rb-clock by means of an
optical frequency comb. The 7s$^2\,^1$S$_0$(F = 1/2)-7s7p$\,^1$P$_1$(F = 3/2)
transition in $^{225}$Ra was determined to be $621\,042\,124(2)\,$MHz. The
measurements provide input for designing efficient and robust laser cooling of
Ra atoms in preparation of a search for a permanent electric dipole moment in
Ra isotopes.
