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Responses of a 6LiI Bonner Sphere Spectrometer using the Monte Carlo codes PHITS and MCNPX
Rafael Santos Oliveira1, Juliana Batista da Silva1, Lucas Moacir Machado Mendes1
1Centro de Desenvolvimento da Tecnologia Nuclear, Belo Horizonte, Brazil.
Summary
Response functions for a Bonner Sphere Spectrometer were calculated using PHITS and MCNPX Monte Carlo codes. Comparing results highlights the impact of different nuclear data and physics models on neutron detection.
Area of Science:
- Nuclear physics and instrumentation
- Radiation detection and measurement
Background:
- Accurate characterization of neutron detection systems is crucial for radiation safety and research.
- Bonner Sphere Spectrometers (BSS) are widely used for neutron spectrum unfolding.
- The accuracy of BSS response functions (RFs) depends on simulation codes and nuclear data.
Purpose of the Study:
- To calculate the response functions (RFs) of a Bonner Sphere Spectrometer (BSS) with a 6LiI thermal neutron detector.
- To compare RFs calculated using PHITS and MCNPX codes with existing published data.
- To analyze the influence of different nuclear data libraries and physics models on the calculated RFs.
Main Methods:
- Monte Carlo simulations were performed using PHITS (version 3.26) and MCNPX (version 2.7.0).
- Calculations utilized the default nuclear data libraries and physics models within each code.
- Response functions were compared against previously published data obtained using MCNP6.1.
Main Results:
- Calculated response functions using PHITS and MCNPX show variations.
- Discrepancies were observed when compared to published MCNP6.1 data.
- The study quantifies the impact of code-specific nuclear data and physics models on BSS RFs.
Conclusions:
- The choice of Monte Carlo code, nuclear data library, and physics models significantly influences Bonner Sphere Spectrometer response functions.
- Understanding these influences is essential for accurate neutron dosimetry and spectral measurements.
- Further investigation into specific nuclear data and model effects is warranted for improved BSS simulations.
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