Yes, but hydrogen is cheap. Especially compared to anti-matter. Shielding is also going to be a huge issue for anti-matter drives (even without a human crew).

Yes, but hydrogen is cheap. Especially compared to anti-matter. Shielding is also going to be a huge issue for anti-matter drives (even without a human crew). Anyone know how the energy of EM radiation emitted from a fusion reaction compares to that emitted from an matter:anti-matter reaction?