  We numerically study the decay of cosmic global string loops due to radiation
of Goldstone bosons and massive scalar ($\chi$) particles. The length of loops
we study range from 200-1000 times the width of the string core. We find that
the lifetime of a loop is $\approx 1.4 L$. The energy spectrum of Goldstone
boson radiation has a $k^{-1}$ fall off, where $k$ is the wavenumber, and a
sharp peak at $k \approx m_\chi/2$, where $m_\chi$ is the mass of $\chi$. The
latter is a new feature and implies a peak at high energies (MeV-GeV) in the
cosmological distribution of QCD axions.
