Why is polyethylene or water effective for spacecraft shielding?
Answer
They slow down high-energy particles without generating secondary radiation
While materials like aluminum have historically been used for shielding, they are prone to producing secondary radiation when hit by high-energy cosmic particles. In contrast, hydrogen-rich substances like polyethylene or water are highly effective at moderating or slowing down these energetic particles. By dissipating the energy of incoming cosmic rays more efficiently without triggering the harmful secondary particle cascades associated with heavier metals, these materials provide superior protection for the crew and sensitive systems.
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