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Updated: Aug 5, 2026
06:20
Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
Published on: March 11, 2021
Space Radiation and Cancer Risk in Astronauts: Models, Evidence, Uncertainties, and Emerging Imaging Perspectives
Chiara Zanon1, Michele Basilicata2,3, Agostino Chiaravalloti4,5
1Department of Radiology, University of Padova, Via Giustiniani 2, 35128 Padova, Italy.
Tomography (Ann Arbor, Mich.)
|July 27, 2026
Summary
Estimating cancer risk for astronauts exposed to deep space radiation is challenging. Current models show significant uncertainties, suggesting potential risks may be higher than previously thought.
Area of Science:
- Space medicine
- Radiation oncology
- Astrobiology
Background:
- Astronauts face significant radiation exposure beyond Earth's magnetosphere.
- Galactic cosmic rays and solar particle events pose cancer risks.
- Accurate cancer risk estimation is crucial for long-duration space missions.
Purpose of the Study:
- To review quantitative models for astronaut cancer risk assessment.
- To compare historical and current risk estimations.
- To identify uncertainties and future directions in space radiation risk modeling.
Main Methods:
- Narrative review of quantitative models.
- Analysis of particle fluence-based cross-sections, mixture models, and REID frameworks.
- Examination of uncertainty distribution and ensemble modeling approaches.
Main Results:
- Early models estimated 1-year excess cancer mortality at 1.1-1.3%.
- Later models project lifetime cancer incidence between 2.20-2.98% per Sievert.
- Current NASA standards use a 600 mSv career dose limit, but recent models suggest higher risks.
Conclusions:
- Substantial uncertainties persist in high-LET radiobiology and mixed-field exposures.
- Space exploration mission risks may be underestimated.
- Further research and validated biomarkers are needed for accurate astronaut cancer risk assessment.
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