Say we have a guy orbiting Earth in LEO with no spacesuit (I know, I know), what would be the millisieverts he would be receiving?
After a lot of reasearch, I've found this NASA page https://srag.jsc.nasa.gov/Publications/TM104782/techmemo.htm where it states that "The integral GCR dose rate in free space is approximately a factor of 2.5 higher at solar minimum than at solar maximum. During solar minimum, the unshielded dose to the blood forming organs (BFO) is approximately 60 rem/year." and "Compared to low inclination orbits, higher inclination orbits are exposed to increased GCR levels as the spacecraft transits the higher latitudes. In the proposed Space Station orbit, the magnetic field provides a factor of 10 reduction in total GCR exposure relative to the free space environment." So according to that site the short answer to my question is: the guy would be roughly receiving an average dose of 0.00685 mSv/h in LEO in low inclination orbits at solar minimum.