This REID is still> 3% of the NASA's permissible exposure limit (PEL) *A lethal dose of 391 mSv seems to correspond to the NASA's PEL 3% of REID *Results of this study suggest that a future space flight to Mars would need increase in propulsion power for a faster speed and a shortened round trip, and increase in protective radiation shielding to reduce
radiation dose rate, and a shortened stay on Mars for the astronauts' radiation safety in a future space flight to Mars.
It is shown that the real-time
radiation dose rate of the moveable radiation source deposited in a lead box is between 0.25 [micro]Gy/h and 0.5 [micro]Gy/h, the radiative dose rate of the environmental background is between 0 and 0.15 [micro]Gy/h, and the former is more volatile than that of the latter.
The result for
radiation dose rate is shown in [Table 3].
Radiation dose rate varies with the inverse square of distance.
Combining this with the
radiation dose rate, measured by other means, results in an age for the grains.
Exposure was assessed based on nationwide surveys of
radiation dose rate from the Chernobyl fallout, from both external and internal exposures.