How much protection do space EVA suits offer against radiation? Do they shield certain kinds of radiation more than others? Any idea how many sieverts an individual is exposed to wearing a space suit on an EVA for 1 hour?
There are three ways to protect ourselves from radiation:
Keeping a distance from the source
Minimizing the time of exposure to radiation
Using shielding .
However, in space the only way to protect from radiation is by using the last two points.
Space suits provide protection from the UV rays, but they provide limited protection from particle radiation and gamma and x ray.
If particles have enough energy they simply pass through the space suit.
So EVAs are planned during low solar activity or they try to make the EVA short.
They do very little. The suit will stop alpha and I believe beta radiation. However, gamma and x-ray radiation go right through. The only thing you can use to stop those is lots of mass, and spacesuits are as light as possible.
Most 'radiation' suits, by the way, do little to stop actual radiation. They are generally intended to contain radioactive materials on the outside of the suit for easy decontamination. The dose is then monitored with dosimeters and handheld detectors. Areas of high radioactivity are simply not entered at all or only entered for short periods of time. This is done in spaceflight as well - astronauts do not perform EVAs during solar flares, for example.