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Similar to The Biological Effects of Radiation to Humans on a Manned Mission to Mars
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The Biological Effects of Radiation to Humans on a Manned Mission to Mars
- 1. The Biological Effects of Radiation to Humans on a Manned Mission to Mars By Dan Maierhafer For the Clemson Chapter of the Health Physics Society on February 6, 2001
- 3. Mars Facts 9.78 m/s^2 3.72 m/s^2 (0.38 x Earth) Gravity 1380 W/m^2 595 W/m^2 Solar Irradiance 23.9 hours 24.6 hours Rotational Period 365 days 687 days Orbital Period 101,325 Pa (1 atm) 699 - 912 Pa (0.0069 to 0.009 atm) Atmospheric Pressure Earth Mars Parameter
- 4. Mars Facts: Atmospheric Comparison between Mars and Earth N/A 0.03% H 2 O N/A 0.07% CO 20.9% 0.13% O 2 0.93% 1.6% Ar 78% 2.6% N 2 0.03% 95.3% CO 2 Earth Mars Atmospheric Composition
- 8. NCRP Equivalent Dose Limit Guidelines for Astronauts (cSv) 59.25 N/A N/A GOST Annual 100-400 depending on age 400 600 Career 50 200 300 Annual 25 100 150 30-day BFO Eye Skin Time of Exposure
- 15. Protection from Radiation in Space
- 16. Are you Asleep?
- 20. Predicted Mission Dose for Astronaut 0.2681 - 0.3026 N/A N/A Total Fatal Cancer Risk 0.0681 - 0.1026 0.05 (1/Sv) 1.3607 - 2.0507 (Sv) Totals for Mission 0.015 0.05 (1/Sv) 0.3 (Sv) Max. from Nuclear Rover 0.0166 0.05 (1/Sv) .3313 (Sv) 550 days on Mars Surface 0.0183 - 0.0355 0.05 (1/Sv) 0.3647 - 0.7097 (Sv) Inbound (5g/cm^2 shield) 0.0183 - 0.0355 0.05 (1/Sv) 0.3647 - 0.7097 (Sv) Outbound (5g/cm^2 shield) Cancer Risk Probability of Fatal Cancer Equivalent Dose to BFO Mission Portion
Editor's Notes
- Argon
- Argon
- With proper design, the mission provisions can be used to create an onboard storm shelter to provide protection from solar flares in transit. While capable of delivering a deadly dose of several thousand rems to an unshielded astronaut, solar flares, which are composed of large numbers of protons with energies of about 1 million volts, can be stopped by five inches of water or food material. The ship will have enough provisions on board to provide a small area with more than that amount of shielding. Solar flares occur irregularly, with dangerous events happening for a few hours perhaps once a year. During their year in space (six months in transit each way) the crew will only have to endure one or two brief periods of tight confinement in the storm shelter Cosmic rays, which are made of particles with billions of volts of energy cannot be stopped by such thin shielding. However the magnitude of the dose that will be incurred is only about 50 rem per year. This will cause no immediate hazard. Rather, a statistical risk of cancer will result, comparable to smoking cigarettes for the same period. This may be regarded as an acceptable level of risk. If desired, the hab module can remain connected with a tether to the spent booster upper stages, and then the assembly spun up to create artificial gravity on the way to Mars. Doing this will allow the crew to avoid any ill effects from long-duration zero gravity exposure. Although, in 1996, astronaut Shannon Lucid showed that if a strenuous exercise program were strictly followed, zero gravity for the six month flight time to Mars could be endured without harm.