A study of a H2O-moderated 241AmBe source for neutron metrology

Autores/as

DOI:

https://doi.org/10.15392/2319-0612.2024.2724

Palabras clave:

Neutron Metrology, AmBe-241 moderated, Bonner Spheres Spectrometry, Monte Carlo Simulation

Resumen

The update to ISO 8529-1 (2021) reduces the variety of neutron fields from sources. For neutron metrology, it is crucial to have a standard radiation field with known fluence and energy well-defined. This study focuses on analyzing new energy ranges and characterizing moderated neutron fields, emphasizing the importance of low-energy neutrons and their impact on dose assessment. Experiments and simulations were conducted with the moderation of the 241AmBe source in light water, enabling the characterization of a new moderated spectrum and the presentation of reference values for physical and radioprotection quantities. This expands the energy options for irradiation and instrument calibration.

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Referencias

[1] PEREIRA, W. W; FONSECA, E. S; LEITE, J. O; PATRÃO, K. C. S. Metrologia de Nêutrons no Laboratório Nacional de Metrologia das Radiações Ionizantes. Revista Brasileira de Pesquisa e Desenvolvimento, v. 7, p. 113-119, 2005.

[2] MÉNDEZ, R; GÓMEZ-ROS, J.M; THOMAS, D.J; THOMPSON, A.K.; BEDOGNI, R. Revision of the 252Cf and D2O-moderated 252Cf reference neutron fields for use in radiation protection dosimetry. Radiation Physics and Chemistry, v. 184, 109433, ISSN 0969-806X, 2021.

[3] PIOCH, C; et al. Calibration of a Bonner Sphere Spectrometer in Quasi-monoenergetic Neutron Fields of 244 and 387 MeV. Journal of Instrumentation, v. 6, P10015, 2011.

[4] AZA, E; et al. A Bonner Sphere Spectrometer for Pulsed Fields. Radiation Protection Dosimetry, v. 168, issue. 2, p. 149-153, 2016.

[5] JUNIOR, R. M. L. Desdobramento de Espectros de Nêutrons Utilizando o Método de Monte Carlo e Redes Neurais, Tese. UFRJ/COPPE, Brasil, 2009.

[6] BRIESMEISTER, J. F. MCNP, A General Monte Carlo N-Particle Transport Code. Los Alamos National Laboratory, v. 4C2, USA, 2001.

[7] EXLINE, P. R. Characterization of Modified Neutron Fields with Americium-Beryllium and Californium-252 Source, M. Sc. Thesis. Georgia Institute of Technology, EUA, 2011.

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Publicado

2025-03-19

Cómo citar

A study of a H2O-moderated 241AmBe source for neutron metrology. Brazilian Journal of Radiation Sciences (BJRS), Rio de Janeiro, Brazil, v. 12, n. 4A (Suppl.), p. e2724, 2025. DOI: 10.15392/2319-0612.2024.2724. Disponível em: https://bjrs.org.br/revista/index.php/REVISTA/article/view/2724. Acesso em: 17 jul. 2025.