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Updated: Aug 27, 2025

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
Published on: May 3, 2019
Measurements of epithermal neutron properties of ITU Triga Mark II research reactor
Neslihan Koyuncu1, Onur Erbay1, İskender Atilla Reyhancan1
1Istanbul Technical University, Energy Institute, Ayazaga Campus, Maslak, Sariyer, 34469, Istanbul, Turkey.
Abstract:
The k0 standardization method is one of the most commonly used neutron activation analyses to determine the concentrations of elements in the sample. To perform this method, it is required to know the neutron spectrum parameters such as epithermal neutron flux shape factor (α) and thermal to epithermal neutron flux ratio (f). In this study, the α and f parameters were determined using the Cd-ratio dual monitor method and bare triple monitor method. In both methods, irradiation studies were performed in the central thimble at the ITU Triga Mark II research reactor. A gamma-ray counting system (HpGe detector) was used for measuring foil activation values. The selected monitors were 197Au and 94Zr for the Cd-ratio dual monitor method and 197Au/94Zr/96Zr for the bare triple monitor method. The α and f parameters were -0.221 ± 0.018 and 41.826 ± 4.701 for 197Au/94Zr (724 keV) monitors, -0.231 ± 0.019 and 42.626 ± 4.791 for 197Au/94Zr (756 keV) monitors, 0.228 ± 0.025 and 43.917 ± 3.596 for 197Au/94Zr/96Zr monitors, respectively.
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