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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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Sewable soft shields for the γ-ray radiation.

Seok Hyeon Gwon1,2, Jeong-Hwan Oh3, Minseok Kim3

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New hydrogel-based soft shields offer flexible radiation protection. These wearable gamma-ray shields are stretchable, biocompatible, and can be sewn, overcoming limitations of traditional rigid materials.

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Area of Science:

  • Materials Science
  • Radiation Physics
  • Biomedical Engineering

Background:

  • Traditional radiation shielding materials (e.g., HDPE, epoxy) possess high modulus, hindering their application in wearable forms.
  • Development of flexible and biocompatible materials is crucial for personal protective equipment during radioactive accidents.

Purpose of the Study:

  • To synthesize and characterize a novel soft shield based on hydrogel for effective gamma-ray attenuation.
  • To evaluate the mechanical properties, stretchability, and processability of the hydrogel-based soft shield for wearable applications.

Main Methods:

  • Hydrogel synthesis incorporating gamma-ray shielding particles (PbO2) within an interpenetrating network structure.
  • Mechanical testing including tensile strength and stretchability measurements.
  • Evaluation of radiation attenuation properties and sewing capabilities.

Main Results:

  • The synthesized soft shields containing 3.33 M PbO2 demonstrated a high attenuation coefficient of 0.284 cm⁻¹.
  • The hydrogel shields exhibited excellent stretchability, reaching up to 400% elongation without rupture.
  • The material's high energy-dispersion ability allowed for direct sewing without fabric support.

Conclusions:

  • Hydrogel-based soft shields represent a promising advancement in personal radiation protection.
  • The developed material offers superior flexibility, biocompatibility, and processability compared to conventional shielding materials.
  • Direct sewing capability enables the fabrication of customized, wearable radiation shields for enhanced safety.