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<p>This study aimed to characterize an epithermal neutron field near a target used for the production of <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\(^{18}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mn>18</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>F in a medical cyclotron. A set of activation detectors was placed inside a <InlineEquation ID="IEq9"> <EquationSource Format="TEX">\(^{10}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mn>10</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>B<InlineEquation ID="IEq10"> <EquationSource Format="TEX">\(_4\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mn>4</mn> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation>C filter capsule, which effectively suppressed thermal neutrons and enabled the investigation of neutron energies in the epithermal region. The measured reaction rates were analyzed and compared with Monte Carlo simulations. A fixed neutron source was developed from previously measured spectral data and tuned to accurately represent the neutron environment, particularly at low energies. This source provided significantly better agreement with the experimental results than simulations relying on nuclear models or evaluated data libraries. The validated neutron source will be used in future studies to assess the radiation field around cyclotrons and improve dosimetry in similar environments.</p>

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Epithermal neutron field measurement near \(^{18}\)F production target with \(^{10}\)B\(_4\)C filter

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Marek Zmeskal,
  • Michal Kostal,
  • Jan Simon,
  • Simon Vadjak,
  • Vladimir Radulović

摘要

This study aimed to characterize an epithermal neutron field near a target used for the production of \(^{18}\) 18 F in a medical cyclotron. A set of activation detectors was placed inside a \(^{10}\) 10 B \(_4\) 4 C filter capsule, which effectively suppressed thermal neutrons and enabled the investigation of neutron energies in the epithermal region. The measured reaction rates were analyzed and compared with Monte Carlo simulations. A fixed neutron source was developed from previously measured spectral data and tuned to accurately represent the neutron environment, particularly at low energies. This source provided significantly better agreement with the experimental results than simulations relying on nuclear models or evaluated data libraries. The validated neutron source will be used in future studies to assess the radiation field around cyclotrons and improve dosimetry in similar environments.