180-2 Utilization of Hexagonal Boron Nitride (hBN) and High-Density Polyethylene (HDPE) in Aircrafts to Reduce Cosmic Ionizing Radiation (CIR) Exposure and Carbon Emissions

Session: Geoscience Outreach Efforts to Broaden Participation (Posters)

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Aircrew members receive the highest levels of ionizing radiation among U.S. workers, second only to astronauts. Studies have shown that they experience higher rates of certain cancers compared to the general population. These increased risks are believed to arise from aviation-specific exposures, including chronic exposure to cosmic ionizing radiation (CIR). While research on the correlation between CIR and cancer risk is still ongoing, evidence from the National Institute for Occupational Safety and Health (NIOSH) suggests a possible link between CIR and a higher risk of miscarriage in pregnant flight attendants, raising further concern. According to the U.S. Department of Transportation's Federal Aviation Administration (FAA), the recommended radiation dose limit is 0.5 millisievert (mSv) per month for pregnant workers. However, a pregnant crewmember working on high-altitude flights from Athens (Greece) to New York City may receive a monthly dose of approximately 0.57 mSv. Furthermore, as airlines seek greater fuel efficiency by flying at higher altitudes, CIR exposure is projected to increase by an estimated 30–50% on long-haul routes, emphasizing the need for radiation shielding. Composite structures made of hexagonal boron nitride (hBN) and high-density polyethylene (HDPE) are significantly more effective at shielding radiation than aluminum, the standard material for aircraft structures. Simulation data show that hBN-HDPE is 72 times more effective at reducing the effective dose of radiation than aluminum and 4 times more effective than HDPE alone. These composites are also lightweight and compatible with modern additive manufacturing methods, making them a viable and flexible substitute for aluminum on aircrafts. Implementing hBN-HDPE can also help reduce dependency on aluminum given its current supply chain volatility. By replacing aluminum with hBN-HDPE, airlines can mitigate the effective dose of radiation experienced by aircrew and passengers and allow for high-altitude, fuel-efficient flights that help reduce carbon emissions and keep crewmembers safe.

Geological Society of America Abstracts with Program. Vol. 57, No. 6, 2025

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