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Radiation Protection Dosimetry 2005 115(1-4):254-257; doi:10.1093/rpd/nci187
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Comparison of deterministic and Monte Carlo methods in shielding design

A. D. Oliveira* and C. Oliveira

Departamento de Protecção Radiológica e Segurança Nuclear, Instituto Tecnológico e Nuclear, EN 10, Apartado 21, 2686-953 Sacavem, Portugal

* Corresponding author: adoliv{at}itn.mces.pt

In shielding calculation, deterministic methods have some advantages and also some disadvantages relative to other kind of codes, such as Monte Carlo. The main advantage is the short computer time needed to find solutions while the disadvantages are related to the often-used build-up factor that is extrapolated from high to low energies or with unknown geometrical conditions, which can lead to significant errors in shielding results. The aim of this work is to investigate how good are some deterministic methods to calculating low-energy shielding, using attenuation coefficients and build-up factor corrections. Commercial software MicroShield 5.05 has been used as the deterministic code while MCNP has been used as the Monte Carlo code. Point and cylindrical sources with slab shield have been defined allowing comparison between the capability of both Monte Carlo and deterministic methods in a day-by-day shielding calculation using sensitivity analysis of significant parameters, such as energy and geometrical conditions.


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