  To observe the ${\gamma}$ rays emitted from the low-lying isomeric state of
$^{229}$Th ($^{229\rm{m}}$Th), we aim to dope fluoride crystals with its
precursor $^{229}$Pa. In this study, we produced $^{229}$Pa by a 30-MeV proton
bombardment on $^{232}$Th and developed a chemical separation method. The
chemical yield of Pa was 93(4)%, and the physical production yield of
$^{229}$Pa for the proton energy range of 29.0${-}$30.1 MeV was measured to be
9.4(8) MBq/${\rm{\mu}}$Ah, which was more than 10 times higher than those of
$^{232,230,228,233}$Pa. These high chemical and production yields will allow us
to prepare fluoride crystals having a sufficient amount of $^{229}$Pa for the
observation of the ${\gamma}$ rays of $^{229\rm{m}}$Th.

Instrumentation and Detectors;Nuclear Experiment