Space Radiation

Dr Paul Wilson, Pacific Northwest National Labs Biomedical Scientist discusses the significant challenges and invisible risks of solar energenic particles and galactic cosmic rays to human spaceflight. 
Astronauts are exposed to ionizing radiation with effective doses from 50 to 2,000 mSv.  This is the equivalent of 150 to 6,000 chest x-rays. - NASA
Image Credits; Polaris Dawn, Europa Clipper - SpaceX, All others - NASA, PNNL