 RXF1 could hypothetically provide adequate shielding for a 30 month mission to Mars.
Today, to the dump. Tomorrow, to the stars? Polyethylene might take you farther than you ever imagined.
NASA Space Radiation Shielding Program -- NASA project researching radiation shielding technologies where RXF1 was invented
Can People Go To Mars? -- (Science@NASA) Space radiation between Earth and Mars poses a hazard to astronauts. How dangerous is it out there? NASA scientists are working to find out.
NASA Space Radiation Health Project -- The purpose of NASA's Space Radiation Health Project (SRHP) is to achieve human exploration of space without exceeding an acceptable level of risk from exposure to space radiation.
Fire Away, Sun and Stars! -- article about radiation shielding technologies