Good news for future Moon crews: radiation up there turns out gentler than anyone expected

Two human-shaped mannequins flew around the Moon aboard NASA's uncrewed Artemis I Orion capsule in 2022, carrying more than 10,000 tiny crystal detectors that recorded exactly how much space radiation a body would soak up. Now physicists at the Institute of Nuclear Physics of the Polish Academy of Sciences in Cracow have read out their home-grown lithium fluoride crystals — they work like photographic film, storing the tracks left by individual particles — and the answer is reassuring: the radiation dose near the Moon is only moderately higher than in Earth orbit, a much smaller jump than intuition suggested. Their crystal readings matched conventional detectors to within 15%, and even caught particle tracks too faint for older instruments to see — a simpler, wearable way to keep future astronauts safe.