Comment by walrus01

a relatively detailed analysis of estimated radiation for a 650 day trip to mars:

https://pmc.ncbi.nlm.nih.gov/articles/PMC9916691/

from other sources If I'm reading things right, one estimate of a round trip to mars would be 1000 millisieverts, which is considerable, the maximum allowed annual dose for a US radiation industry worker is 50mSv.