Comparison of different geometric configurations and materials for neutron radiography purposes based on a 241ambe neutron source

Comparison of different geometric configurations and materials for neutron radiography purposes based on a 241Am/Be neutron source J A n A a m p © t K 1 t r i d 7 e P h 1 C ARTICLE IN PRESS+Model TUSC[.]

Journal of Taibah University for Science xxx (2016) xxx–xxx

ScienceDirect

Comparison of different geometric configurations and materials for neutron radiography purposes based on a 241 Am/Be neutron source

J.G Fantidis

Department of Electrical Engineering, Eastern Macedonia and Thrace Institute of Technology, Kavala, Greece

Received 4 April 2016; received in revised form 15 August 2016; accepted 2 October 2016

Abstract

Thepresentworkexaminestwodifferentgeometricconfigurationsandthreedifferentliningmaterialsthataresuitableforthermal neutronradiographypurposesbasedona241Am/Beneutronsource.Thesamesourcewasalsousedforfastneutronradiography Appropriatecollimatorsweresimulatedforeachoftheradiographymodes,comparingtheeffectivenessofCadmium,Gadolinium, andBoralasliningmaterialsforthermalneutronradiographyandevaluatingtheefficiencyofIronandTungstenasinteriorwall materialsofthecollimatorinthecaseoffastneutronradiography.Thepresentedfacilitieshavebeensimulatedforawiderangeof parametervaluestocharacterizeneutronradiographyusingtheMCNP4BMonteCarlocode

©2016TheAuthors.ProductionandhostingbyElsevierB.V.onbehalfofTaibahUniversity.Thisisanopenaccessarticleunder theCCBY-NC-NDlicense(http://creativecommons.org/licenses/by-nc-nd/4.0/)

Keywords: Monte Carlo simulations; Thermal neutron radiography; Fast neutron radiography;241Am/Be

1 Introduction

E-mail address:fantidis@yahoo.gr

Peer review under responsibility of Taibah University.

http://dx.doi.org/10.1016/j.jtusci.2016.10.002

1658-3655 © 2016 The Authors Production and hosting by Elsevier B.V on behalf of Taibah University This is an open access article under the

CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ).

2.1 Neutron source

location)

Fig 1 Normalized neutron spectrum for 241 Am/Be.

2.2 Thermal neutron radiography design

and

u g=L f D

Fig 2 First geometric configuration for the thermal NR considered

facility (not to scale).

θ=tan−1 I

2L



(3)

collimator

n

Fig 3 Second geometric configuration for the thermal NR considered facility (not to scale).

2.3 Fast neutron radiography design

Fig 4 Aperture geometry and collimator design for fast NR (not to

scale).

3 Results and discussion

3.1 Thermal NR

lining

respectively

Table 1

Thermal NR calculated parameters for differentL/Dvalues for the first geometrical configuration.

L(cm) L/D D0 (cm) θ( ◦) U g(cm) Gadoliniumlining Cadmiumlining Borallining

f th(n cm −2s−1) TNC(%) f

th(n cm −2s−1) TNC(%) f

th(n cm −2s−1) TNC(%)

Table 2

Thermal NR calculated parameters for differentL/Dvalues for the second geometrical configuration.

L(cm) L/D D0 (cm) θ( ◦) U g(cm) Gadoliniumlining Cadmiumlining Borallining

f th(n cm −2s−1) TNC(%) f th(ncm−2s−1) TNC(%) f th(ncm−2s−1) TNC(%)

Table 3

Thermal NR calculated parameters for differentL/Dvalues the second geometrical configuration with 5, 10 and 15 cm single sapphire filter.

L(cm) L/D Without Sapphire filter With 5 cm Sapphire filter With 10 cm Sapphire filte With 15 cm Sapphire filter

f th(n cm −2s−1) TNC(%) f

th(n cm −2s−1) TNC(%) f

th(n cm −2s−1) TNC(%) f

th(n cm −2s−1) TNC(%)

D0

U g

L f

L f

L f

F F

2 s

1 )

f F

F F

2 s

1 )

4 Conclusions

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