AI Article Synopsis
- Astronauts on exploratory missions are exposed to heavy particles that can affect cognitive performance, particularly noting that lower linear energy transfer (LET) particles require a smaller dose to impact cognition.
- Research has identified that exposure to low LET helium (He) particles could contribute significantly to the total radiation dose astronauts face.
- Findings indicate that even low doses of He particles (as low as 0.01-0.025 cGy) can cause changes in neuronal function and cognitive performance, suggesting a higher risk of cognitive deficits for astronauts than previously understood.
Article Abstract
On exploratory class missions, astronauts will be exposed to a range of heavy particles which vary in linear energy transfer (LET). Previous research has shown a direct relationship between particle LET and cognitive performance such that, as particle LET decreases the dose needed to affect cognitive performance also decreases. Because a significant portion of the total dose experienced by astronauts may be expected to come from exposure to low LET He particles, it would be important to establish the threshold dose of He particles that can produce changes in cognitive performance. The results indicated that changes in neuronal function and cognitive performance could be observed following both head-only and whole-body exposures to He particles at doses as low as 0.01-0.025 cGy. These results, therefore, suggest the possibility that astronauts on exploratory class missions may be at a greater risk for HZE-induced deficits than previously anticipated.
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| http://dx.doi.org/10.1016/j.lssr.2019.02.001 | DOI Listing |
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