  Ingress of hydrogen is often linked to catastrophic failure of Ti-alloys.
Here, we quantify the hydrogen distribution in fully \b{eta} and
{\alpha}+\b{eta} Ti-Mo alloys by using atom probe tomography. Hydrogen does not
segregate at grain boundaries in the fully \b{eta} sample but segregates at
some {\alpha}/\b{eta} phase boundaries with a composition exceeding 20 at.% in
the {\alpha}+\b{eta} sample. No stable hydrides were observed in either sample.
The hydrogen concentration in \b{eta} phases linearly decreases from ~13 at. %
to ~4 at. % with increasing Mo-content, which is ascribed to the suppression of
hydrogen uptake by Mo addition.
