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Updated: Feb 10, 2026

Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor
Published on: May 7, 2021
EXPERIMENTAL AND COMPUTATIONAL EVALUATION OF EFFECTIVE CENTRE FROM A LONG COUNTER AT NEUTRON METROLOGY LABORATORY IN
S S Fernandes1,2, A Astuto1, K C S Patrão2
1Programa de Engenharia Nuclear-COPPE/UFRJ, Av Horácio Macedo, 2030, Bloco G/Sala 206, Centro de Tecnologia, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, RJ, Brazil.
A new neutron detector was developed and tested to establish a secondary standard for neutron fluence measurements. Experimental results closely matched Monte Carlo simulations, validating the detector
Area of Science:
- Nuclear Metrology
- Radiation Detection and Measurement
Background:
- Accurate neutron fluence measurements are crucial for radiation safety and research.
- Developing reliable secondary standards is essential for calibrating neutron detection equipment.
Purpose of the Study:
- To characterize a long counter detector for use as a secondary standard for neutron fluence.
- To validate experimental measurements with Monte Carlo simulations.
Main Methods:
- Manufactured a long counter detector at the Institute of Advanced Studies (IEAV).
- Experimentally characterized the detector using various neutron sources (252Cf+D2O, 252Cf, 241AmBe, 238PuBe) at the Brazilian National Ionising Radiation Metrology Laboratory (LNMRI/IRD).
- Developed Monte Carlo simulations to reproduce the experimental setup and detector construction.
Main Results:
- Determined the effective centre of the long counter detector across a range of neutron energies (0.55 to 4.16 MeV).
- Achieved good agreement between experimental measurements and Monte Carlo simulation results.
- Established the detector's performance for neutron fluence characterization.
Conclusions:
- The characterized long counter detector is suitable for deployment as a secondary standard for neutron fluence.
- The validated Monte Carlo model can be used for further optimization and analysis of the detector system.
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