  We compare the prospects for detecting a neutrino magnetic moment by the
measurement of neutrinos from a tritium source, reactors and low-energy
beta-beams. In all cases the neutrinos or antineutrinos are detected by
scattering of electrons. We find that a large (20 MCurie) tritium source could
improve the limit on the neutrino magnetic moment significantly, down to the
level of a few $\times 10^{-12}$ while low-energy beta-beams with sufficiently
rapid production of ions could improve the limits to the level of a few $\times
10^{-11}$. The latter would require ion production at the rate of at least
$10^{15}$ s$^{-1}$.
