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<p><sup>68</sup>Ge is produced through the proton irradiation of a Ga–Ni alloy target, where the gallium content directly influences the <sup>68</sup>Ge yield. However, increasing the gallium content compromises the thermal stability of the target. TG-DSC combined with in-situ XRD demonstrated that when the gallium content exceeds 70%, the coating of the gallium-nickel alloy target undergoes a phase transformation at 100&#xa0;℃, generating liquid gallium. This means such targets cannot be irradiated in solid-target systems, which operate at approximately 200&#xa0;℃. To overcome this challenge, a bilayer coating target was developed. This design involves coating a high-gallium-content alloy (&gt; 70% Ga) with an outer layer of a 70% gallium-content alloy, which acts as a barrier against the formation of liquid gallium droplets on the target surface. This preparation strategy enables Ga–Ni alloy targets with gallium content exceeding 70% to be directly irradiated in solid-target systems.</p>

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Study of bilayer coating on Ga–Ni alloy target for improving thermal stability

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Yanlin He,
  • Yong Song,
  • Minghuang Wang,
  • Bo Huang,
  • Wei Wang,
  • Xiangwei Zhai

摘要

68Ge is produced through the proton irradiation of a Ga–Ni alloy target, where the gallium content directly influences the 68Ge yield. However, increasing the gallium content compromises the thermal stability of the target. TG-DSC combined with in-situ XRD demonstrated that when the gallium content exceeds 70%, the coating of the gallium-nickel alloy target undergoes a phase transformation at 100 ℃, generating liquid gallium. This means such targets cannot be irradiated in solid-target systems, which operate at approximately 200 ℃. To overcome this challenge, a bilayer coating target was developed. This design involves coating a high-gallium-content alloy (> 70% Ga) with an outer layer of a 70% gallium-content alloy, which acts as a barrier against the formation of liquid gallium droplets on the target surface. This preparation strategy enables Ga–Ni alloy targets with gallium content exceeding 70% to be directly irradiated in solid-target systems.