Determination of double-layer gamma build-up factor using Monte Carlo code, FLUKA: Development of new empirical formula

Das, Avijit; Ray, Aditi; Singh, Tej

doi:10.1016/j.radphyschem.2022.110122

Cited by 4 publications

(5 citation statements)

References 44 publications

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“…We have also evaluated the performance of equivalent DLSs with constituent layers made up of W and PMMA. Following [16], both the cases of layer material ordering, i.e., high-Z (W) surrounded by low-Z (PMMA) and low-Z (PMMA) surrounded by high-Z (W) have been considered.…”

Section: Simulation Systemmentioning

confidence: 99%

“…Estimation of gamma dose has been carried out invoking detailed physics approach that takes into account of bound electron coherent scattering (Rayleigh), bound electron incoherent (Compton) scattering, photoelectric edge treatment, fluorescence emission, annihilation gamma photons and bremsstrahlung due to secondary electrons. Ignoring bound electron contributions has been found to cause significant difference for high-Z materials particularly gamma energies exceeding 3 MeV [16]. In order to validate FLUKA simulation in respect to neutron transport, we have determined macroscopic removal cross-section, the universal parameter that measures the neutron shielding performance.…”

Section: Fluka Simulation Detailsmentioning

confidence: 99%

“…LAC, which describes the gamma shielding capability of a shield material, has been calculated by use of Lambert-Beer law (equation ( 12)) [16].…”

Section: Shielding Parameters Of Polymer Compositesmentioning

confidence: 99%

“…A recent work evaluated the gamma attenuation performance of Bi 2 O 3 metal particles dispersed in PMMA matrix [15]. Present authors have evaluated gamma build-up factor of double-layer shield (DLS) involving iron and PMMA [16]. It was also shown that PMMA performs better than water or low-density polyethylene (LDPE) [17].…”

Section: Introductionmentioning

confidence: 99%

“…Further, effectiveness of W-PMMA composite shield in comparison with equivalent DLS involving W and PMMA has also been investigated. In doing so, following our recent work on iron/PMMA based DLS [16,17], both the combinations of high-Z followed by low-Z and vice versa have been considered. Study clearly indicates the superiority of the single-layer W-PMMA composite over double-layer laminates for shielding wide-energy coupled n-γ radiation.…”

Section: Introductionmentioning

confidence: 99%

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Tungsten-based polymer composite, a new lead-free material for efficient shielding of coupled neutron-gamma radiation fields: A FLUKA simulation study

Das,

Ray,

Singh

2023

Phys. Scr.

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Metal-based polymer composites, a new category of advanced materials, are advantageous for effective protection of radiation field. Recent report of fabrication of tungsten (W)-Poly methyl methacrylate (PMMA) composite microcellular foams with enhanced mechanical strength properties opens up the possibility of its use in radiation attenuation. Objective of this theoretical study is to assess the efficacy of W-based polymer composite, a new lead-free shielding material for attenuating coupled neutron-gamma radiations. Current paper utilizes open-source Monte Carlo code FLUKA to evaluate shielding efficiency of PMMA composites reinforced with varying concentration W particles. Study shows that, adding even 20 vol% of W particles can significantly improve radiation shielding ability of PMMA. Performance of analogous composition Pb-based polymer composite is also examined to demonstrate its inadequacy in radiation protection compared to W-based composite. Study reveals an interesting fact that for any shield dimension, total radiation dose follows an initial descending trend with increase in heavy metal (W/Pb) proportion up to certain optimum value where dose becomes minimum, beyond that dose increases. Optimum heavy metal concentrations are found to be 70 vol% and 30 vol% for W and Pb respectively, with minimum dose for Pb shield being two orders of higher magnitude. Study is further extended to investigate shielding efficiency of conventional double-layer laminates employing W and PMMA in both high-Z/low-Z and low-Z/high-Z configurations as well as optimum concentration of W-PMMA composite and PMMA. It is shown that among all the potential designs, newly introduced composite-based double-layer shield performs best in terms of volumetric dose while single-layer optimized composite shield offers least specific dose.

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Section: Simulation Systemmentioning

confidence: 99%

Section: Fluka Simulation Detailsmentioning

confidence: 99%

“…LAC, which describes the gamma shielding capability of a shield material, has been calculated by use of Lambert-Beer law (equation ( 12)) [16].…”

Section: Shielding Parameters Of Polymer Compositesmentioning

confidence: 99%