  The $^{10}$B isotope has been almost exclusively used in the neutron-capture
radiation therapy (NCT) of cancer for decades. We have identified two other
nuclides suitable for the radiotherapy, which have ca.10 times larger cross
section of absorption for neutrons and emit heavy charged particles. This would
provide several key advantages for potential NCT, such as the possibility to
use either a lower nuclide concentration in the target tissues, or a lower
neutron irradiation flux. By detecting the characteristic $\gamma$ radiation
from the spontaneous decay of the radionuclides, one can image and control
their accumulation. These advantages could be critical for the revival of the
NCT as a safer, more efficient and more widely used cancer therapy.
