If you are worried about radiation, a solar minimum is probably the worst time to send someone. Cosmic rays are more prevalent during solar minimums, and shield

If you are worried about radiation, a solar minimum is probably the worst time to send someone. Cosmic rays are more prevalent during solar minimums, and shielding against solar flares is non-negotiable anyway. The "safe limits" have already been exceeded by people on the ISS. If NASA has decided that we can't send people into space if there is a 3% chance of them getting cancer at some point later in their lives, then NASA has decided that they aren't going to send anyone to Mars, and it's time for us to find someone else who will.