Research press release


Scientific Reports

Health sciences: Health impacts of historical exposure to space radiation reassessed



今回、Robert Reynoldsたちの研究グループは、複数の統計的方法を用いて、1959年以降に選抜された米国NASAの宇宙飛行士と1961年以降に選抜された旧ソ連/ロシアの宇宙飛行士で、追跡調査期間の終了日(米国の宇宙飛行士は2018年7月、旧ソ連/ロシアの宇宙飛行士は2017年12月)より前に少なくとも一度は宇宙飛行を行った者全員について、公開されているデータの解析を再び実施した。この研究によって得られた知見からは、研究対象集団内で発生した心血管疾患とがんに共通の根本的原因がなく、これらの宇宙飛行士の電離放射線被曝線量が、心血管疾患とがんによる高い死亡リスクと関連していないことが示唆される。


A statistical re-analysis of historical data on 301 astronauts and 117 cosmonauts suggests that historical doses of space radiation are not associated with an increased risk of death from cancer or cardiovascular disease. The findings are published in the journal Scientific Reports.

Astronauts and cosmonauts are exposed to unique forms of ionizing radiation that may carry potentially serious health risks. However, previous analyses have not produced conclusive evidence of a possible relationship between ionizing radiation and risk of death from cardiovascular disease and cancer.

Robert Reynolds and colleagues used statistical methods to reanalyse publicly available data on all NASA astronauts selected since 1959 and all Soviet or Russian cosmonauts selected since 1961 who had been to space at least once before the end of the follow-up period; July 2018 for astronauts and December 2017 for cosmonauts, respectively. The findings suggest that any cases of cardiovascular disease and cancer that occurred in the study population do not share a common underlying cause, and that the doses of space radiation these astronauts and cosmonauts were exposed to are not associated with a higher risk of death from either condition.

The authors caution that future missions of deep space exploration will likely be exposed to significantly higher doses of space radiation than historical ones, which may lead to different risk profiles for future astronauts and cosmonauts.

doi: 10.1038/s41598-019-44858-0


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