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<p>Neutron activation is one of the main phenomena responsible for the production of radionuclides and the evolution of material properties when exposed to an intense neutron flux in nuclear facilities. In this study, the induced radioactivity within the Prompt Gamma Activation Analysis (PGAA) system of the TRIGA Mark II reactor was investigated in order to evaluate the long-term distribution of radioactivity and to identify the PGAA components most susceptible to radiation induced aging. The results showed a progressive accumulation of activity in the different elements of the PGAA system during irradiation, with the total activity of the steel collimator increasing to approximately 1210&#xa0;MBq after one month of cyclic irradiation. The results presented indicate that the induced radioactivity remains predominantly within the intermediate level activity category (ILW) for the most exposed rings of the collimator (zones 1–3). Rings 4–7 fall within the low level activity category(LLW), while the remaining rings (8–10) are classified as very low level activity (VLLW). A comparison between Monte Carlo simulation estimates and those obtained using a neutron activation calculator demonstrated good agreement, with discrepancies generally below 14%, confirming the reliability of the obtained results.</p>

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Neutron induced activation and longterm radioactivity assessment of a PGAA system at the TRIGA mark II reactor by Monte Carlo simulation

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Jamila Yousfi,
  • Lamiae Mrharrab,
  • Hamane Lemziouka,
  • Hamid Amsil,
  • Otman Jai,
  • Abdessamad Didi

摘要

Neutron activation is one of the main phenomena responsible for the production of radionuclides and the evolution of material properties when exposed to an intense neutron flux in nuclear facilities. In this study, the induced radioactivity within the Prompt Gamma Activation Analysis (PGAA) system of the TRIGA Mark II reactor was investigated in order to evaluate the long-term distribution of radioactivity and to identify the PGAA components most susceptible to radiation induced aging. The results showed a progressive accumulation of activity in the different elements of the PGAA system during irradiation, with the total activity of the steel collimator increasing to approximately 1210 MBq after one month of cyclic irradiation. The results presented indicate that the induced radioactivity remains predominantly within the intermediate level activity category (ILW) for the most exposed rings of the collimator (zones 1–3). Rings 4–7 fall within the low level activity category(LLW), while the remaining rings (8–10) are classified as very low level activity (VLLW). A comparison between Monte Carlo simulation estimates and those obtained using a neutron activation calculator demonstrated good agreement, with discrepancies generally below 14%, confirming the reliability of the obtained results.