NASA Study: 57-lb AstroRad Vest Cuts Astronaut Radiation in Solar Storms

For space systems engineers and mission planners, the AstroRad results address a hard operational constraint: how to keep crews alive and mobile during solar particle events without paying the mass penalty of full-body storm shelters. The Artemis I manikin data suggest a 57-pound garment could reduce dose to radiosensitive organs while still allowing crew to perform critical tasks outside a hardened shelter.

On August 12, 2026, a U.S., German and Israeli research team reported in the journal Science Advances that the 57-pound (26-kilogram) AstroRad radiation vest worn by a female manikin on NASA’s first Artemis moonshot could drastically cut astronaut radiation exposure during severe solar storms. The finding, based on nearly a month of deep-space measurements around the Moon in 2022, attacks one of the most stubborn risks facing a sustainable human return to the lunar surface: intermittent, difficult-to-predict solar particle events that can deliver acute radiation doses and raise long-term cancer risk.

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Zohar wore the AstroRad vest; Helga flew as an unshielded control.

Radiation is routinely cited by NASA as one of the biggest threats to astronauts as the agency works toward a moon base. Unlike crews on the International Space Station, who remain under Earth’s protective magnetosphere, Artemis astronauts traveling to and from the Moon and operating on the lunar surface will be exposed to galactic cosmic rays and, during solar storms, bursts of energetic protons. A dedicated shelter can protect a crew, but building and sitting out every event imposes mass, schedule and operational constraints. The AstroRad results therefore matter beyond a single garment: they suggest a wearable, selective-shielding approach can preserve crew health and mobility when a storm arrives.

Artemis I carried two female manikins, Zohar and Helga, each a life-size 3 feet from head to lower torso and loaded with thousands of radiation sensors. Zohar wore the AstroRad vest; Helga flew as an unshielded control. Their nearly month-long uncrewed flight around the Moon provided a rare deep-space dosimetry dataset in the actual Orion cabin environment. StemRad and Lockheed Martin developed the vest by adapting concepts from protective gear used by nuclear disaster response teams, then optimized it for spaceflight. The study’s lead author, StemRad’s Jordan Houri, called it the largest experiment ever conducted in this field.

Rather than attempting whole-body shielding, AstroRad concentrates its 57 pounds on the organs most vulnerable to radiation-induced cancer: the lungs, stomach, bone marrow, breasts and ovaries. That targeted design is especially significant for female crew members, who are generally considered more susceptible to radiation-induced cancer than men. The approach also reflects a broader shift in mission architecture: instead of launching heavily shielded modules, a crew can carry a relatively light wearable layer for high-radiation events and rely on normal spacecraft structures the rest of the time.

The study does not provide a single universal reduction percentage in the AP account, but the team described the garment as capable of drastically cutting exposure during severe solar storms and potentially allowing lunar crews to venture beyond their shelters if necessary. That is an important operational nuance. Solar storm warnings can arrive with limited lead time; if a crew can don a vest and continue critical tasks instead of being confined to a shelter, it changes both safety planning and mission timeline calculations.