Space isn't filled with radiation. It's our Sun. You can mostly predict it. The van allen belts are tricky because all the energy directed at Earth is redirected around it. It tends to collect in magnetic pockets.
Outside of that it's not a huge factor.
Your bigger problem is lack of liquid surface tension. It makes it very easy for humans to choke in microgravity environments. Think of the heimleich. You can't do that without body weight created by gravity.
Space isn't filled with radiation. It's our Sun. You can mostly predict it. The van allen belts are tricky because all the energy directed at Earth is redirected around it. It tends to collect in magnetic pockets.
Outside of that it's not a huge factor.
Your bigger problem is lack of liquid surface tension. It makes it very easy for humans to choke in microgravity environments. Think of the heimleich. You can't do that without body weight created by gravity.
Think direct ultraviolet that we're protected from on Earth. You'd basically have to live in a submarine 24/7.
UV is relatively easy to filter. We already need to do space walks and that's why there's a layer of gold mylar on the visor.