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<p>The applicability of polyethylene naphthalate (PEN) sheets for α-particle discrimination was investigated by both experimental and Monte Carlo (MC) simulation approaches. <sup>223</sup>Ra source was sandwiched between two PEN sheets and utilized as a 4πα-detector. The 4πα-γ anticoincidence technique was employed to determine the individual α-efficiencies of <sup>223</sup>Ra and its progeny. As a result, the discriminated α-efficiencies obtained from α-γ anticoincidence spectroscopy for 25, 38 and 50&#xa0;μm PEN sheets were approximately 90% or higher, with β-contribution of 1% or less. In MC simulation, α-efficiency of approximately 100% was obtained for 38 and 50&#xa0;μm thick PEN sheets, with β-contribution of 0.1%. Experimental α-efficiencies declined more sharply with increasing α-energy than those from simulations, likely due to the unmodeled self-absorption and scattering effects.</p>

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Application of polyethylene naphthalate sheets to alpha particle discrimination in the use of 4πα-γ anti-coincidence spectroscopy

  • 期刊论文

  • 发表日期：

    2025年8月2日

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  • Yuya Soeta,
  • Takahiro Yamada,
  • Ken-ichi Mori,
  • Yasushi Sato

摘要

The applicability of polyethylene naphthalate (PEN) sheets for α-particle discrimination was investigated by both experimental and Monte Carlo (MC) simulation approaches. 223Ra source was sandwiched between two PEN sheets and utilized as a 4πα-detector. The 4πα-γ anticoincidence technique was employed to determine the individual α-efficiencies of 223Ra and its progeny. As a result, the discriminated α-efficiencies obtained from α-γ anticoincidence spectroscopy for 25, 38 and 50 μm PEN sheets were approximately 90% or higher, with β-contribution of 1% or less. In MC simulation, α-efficiency of approximately 100% was obtained for 38 and 50 μm thick PEN sheets, with β-contribution of 0.1%. Experimental α-efficiencies declined more sharply with increasing α-energy than those from simulations, likely due to the unmodeled self-absorption and scattering effects.