Flexible stretchable low-energy X-ray (30-80 keV) radiation shielding material: Low-melting-point GaInSnBi alloy/thermoplastic polyurethane composite.

A highly flexible stretchable thermoplastic polyurethane (TPU) composite loaded with a low-melting-point GaInSnBi multiprincipal element alloy (LMPEA) was prepared, and its radiation shielding performance was evaluated. The fluid characteristic of LMPEA and the flexibility of TPU enable good interface compatibility. GaInSnBi LMPEA consists of two eutectic structures, and the liquid gallium-rich phases are distributed at the boundary of the InBi intermetallic compound and Sn solid solution.