An Anisotropic Neutron Collimating System for Proton Accelerator-Generated Secondary Particles

Mucogllava B., UZUN DURAN S., DEMİRKÖZ M. B.

NUCLEAR TECHNOLOGY, cilt.211, sa.11, ss.2870-2879, 2025 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 211 Sayı: 11
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1080/00295450.2025.2461428
  • Dergi Adı: NUCLEAR TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, Pollution Abstracts, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.2870-2879
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Proton-stainless steel interactions occurring at the first collimator of the Middle East Technical University Defocusing Beamline generate high-energy secondary particles like neutrons (<= 23 MeV), gamma rays (<= 14 MeV), and electrons and positrons (UNCT_A_24624747.0 MeV) with particle fluxes between 10(7) to 10(9) particles/(cm(2)center dot s). A neutron collimating system aiming to reduce most of these secondaries and obtain a moderate flux of fast neutrons was designed and constructed. The collimating structure consists of a moderating unit aiming to shield the outside of the system, a neutron funnel to redirect the neutrons to the desired beam geometry, and a testing station. This system funnels neutrons into a 10-cm-diameter nonuniform beam and directs them to a testing area capable of hosting up to six samples of 7.3-cm diameter and up to 3.0-cm thickness. Simulation results show neutrons with energies up to 5.0 MeV and a flux of 10(6) neutrons/(cm(2)center dot s) at the testing unit, while the experimental result gives a neutron dose rate of about 22 mSv/h.