Agnirva Space Premier League - Expedition #30766: Measuring Space Radiation: The Role of Composite Resin Dosimeters

Space radiation is a major concern for long-duration missions. Unlike Earth, which is shielded by its atmosphere and magnetic field, space exposes astronauts and equipment to harmful radiation from solar flares and cosmic rays. To better understand this environment and develop effective shielding, researchers deployed the ExHAM-Composite Resin Dosimeter on the International Space Station (ISS).

This technology demonstration experiment, spearheaded by Dr. Kenji Kinashi from Kyoto Institute of Technology, was a part of Expeditions 55/56 through 59/60. It involved mounting composite resin materials onto the Exposed Experiment Handrail Attachment Mechanism (ExHAM) outside the Japanese Experiment Module on the ISS. These materials acted as passive dosimeters—devices that measure exposure to ionizing radiation over time.

The central innovation was the use of composite resin, a lightweight and moldable substance. When exposed to radiation, the molecular structure of the resin changes. These changes can be analyzed upon return to Earth to determine the type and intensity of radiation exposure. This method provides valuable data on how materials and structures degrade in the space environment.

Such dosimeters are critical in designing future space habitats, satellites, and space suits. By understanding how different materials behave under continuous radiation exposure, scientists can better protect astronauts and ensure the longevity of spacecraft components.

The experiment also served to validate the ExHAM platform’s ability to host small-scale experiments on the ISS. It enabled researchers to collect real-time space environment data without dedicating large portions of crew time or onboard resources.

Radiation exposure remains one of the top risks for human spaceflight, especially for missions to the Moon, Mars, and beyond. Experiments like this lay the groundwork for safer and more durable space missions, helping engineers and designers create the next generation of protective technologies.

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