← Back to NASA Technology Projects
Completed TRL 5 (started at 3, targeting 5)
New project for FY2008.
In space, astronauts are exposed to ionizing radiation that is quantitatively and qualitatively different from terrestrial radiation. This environment includes protons and high-Z high-energy (HZE) ions together with secondary radiation, including neutrons and recoil nuclei that are produced by nuclear reactions in spacecraft materials or tissue. Astronauts who are on missions to the ISS, the Moon or Mars are exposed to ionizing radiation with effective doses in the range of 50 to 2000 mSv (milli-Sievert) projected for possible mission scenarios. Similar doses from terrestrial radiation sources, such as gamma-rays and X-rays, are associated with an increased risk for development of cancer.
Permissible exposure limits (PEL) for Space Radiation limit the allowable mission and career exposure to the space radiation environment based on the projected risk of developing cancer. The PELs are set such that the confidence level of staying within the allowed risk limit is 95%. The use of a median risk estimate could greatly overestimate or underestimate the actual risk to crews because the uncertainties in risk projection models are significant ([95% confidence level/50% confidence level]>4).
Mission, vehicle, and crew selection requirements are outcomes of the Space Radiation PELs, including requirements on vehicle design, mission duration, and age, gender, or past mission history for crew selection.
Listed on TechPort itself — the most direct way to ask about this specific project.
This is early/mid-stage (TRL 5) — the most realistic path in is NASA SBIR/STTR, which funds small businesses and research institutions to develop technology aligned with NASA's needs (equity-free, phased funding). Check whether a current SBIR/STTR solicitation topic overlaps with this project's technology area, or contact the project directly (above) to ask.
None of these are guaranteed paths for this specific project — TechPort itself doesn't have an "apply" button. Reaching out to the contact(s) above with a specific question is usually the fastest way to find out what's actually open.