Application of muon tomography to detection of hidden nuclear substances

10/07/2012 Mu-Steel 1

RFCS (UE)

Mu Steel: a specific application

Project Title: MU-STEEL - Muons scanner to detect radioactive sources hidden in scrap metal containers

Project carried out with a grant of the European Commission within the Research Fund for Coal and Steel

Partners

Muon tomography applied to steel waste entering EAF sites

10/07/2012

Università di Brescia - Dipartimento di Ingegneria Meccanica e Industriale

Università di Padova – Dipartimento di Fisica

Istituto Nazionale Fisica Nazionale, Padova

SRB Costruzioni http://www.srb.it/

Development of an inspection portal

Muon tomography can give the indication of the

presence of lead or heavy metal containers which can possibly shield radioactive

residues present in the incoming scrap 2Mu-Steel

Introduction Basic Principle of muon tomography

Two detectors positioned above and below the volume under investigation to evaluate the deviation angle of muons.

Requirements of Requirements of Muon Muon Tomography:Tomography:-- large area large area

10/07/2012 Mu-Steel 3

-- large area large area tracking devicetracking device-- good angular good angular resolution ( 10 resolution ( 10 mrad)mrad)

Schema • Tomografia muonica

Tecnica funziona e bene (col dimostratore- Camere CMS)

• Mu-steel; Progetto prevede costruzione rivelatori “facili” (FATTI)

Disegno portale

• Mu-Steel Finisce nel 2012!!! • Mu-Steel Finisce nel 2012!!! ma alla commissione piace talme nte che il prossimo anno VOGLIONO FARE LA RIUNIONE A PADOVA

• Fase 2 Costruzione prototipo Portale

Presentazione domande settembre 2013

Eventuale approvazione Gennaio 2014

Partenza eventuale progetto Luglio 2014

Recostruction speed

• Test case: – Pb block (~10 dm3) buried

into scrap metal over a solid iron slab

– Total Fe thicness equivalent – Total Fe thicness equivalent to 2.5 m of scrap iron

Time to recostruct a sample of– 500 k-muons – 500 k-voxels

• Previous package: ~15 min. • Present package: ~30 sec

The effect of filters: high statistics case

Mu-Steel 6

Without filtering With filtering10/07/2012

The effect of filters: low statistics case

Mu-Steel 7

Without filtering With filtering10/07/2012

Muon detector prototype • Design compatible with

modularity of the Inspection System

• Construction/ assembly progressing, with a small delay (4 m) with respect to schedule

Mu-Steel 810/07/2012

Inspection System Design • The design of the inspection portal

has been completed• It was meant to guide the following

tasks:– Detector prototype structure– Portal simulation software package– Portal simulation software package– Portal cost estimate

• The design has been made “as complete as possible”.

• It will be simplified according to the results of the analysis of performance

Mu-Steel 9

Prosecuzione• Persone coinvolte: M. Furlan, S. Vanini, (+ 2 persone a Ge) art. 2222, M. Benetton PC, E. Conti, F. Gonella ,G. Nebbia, M. Pegoraro+ L. Barcellan, M. Nicoletto,L. Ramina, M. Zago+ UNIPD

•Continuità (per alcuni) assicurata da fondi Universitari

•Tempo per preparare domanda FASE 2 e manutenzione prototipo

Ingegnere (2 mu)

10

uff . tecnico (2 mu)

Off. Meccanica (1 mu)

Lab. elettronico (2mu)

Lavoro fuori quota per scrittura progetto, interazioni con partner ecc.

10/07/2012 Mu-Steel

Backup

1110/07/2012 Mu-Steel

1.1. Single Scattering Approximation, POCA (Point Of Single Scattering Approximation, POCA (Point Of Closest Approach).Closest Approach). Tends to fail with several scattering centers

2.2. TomographicTomographic Methods.Methods.Rigorous data treatment requires a maximum likelihood approach together with iterative techniques similar to those applied in the advanced processing of medical imaging data (PET, SPECT). The results presented in this contribution are

Reconstruction TechniquesRivelatore

Rivelatore

!

Rivelatore

Rivelatore

Detector

Detector Detector

Detector

The results presented in this contribution are obtained using - a 3D projector-backprojector pair (proback) where onlyangular deviations are modelled: angular deviations are modelled: List Iterative Mode Algorithm (LMIA). - a 3D tomographic reconstruction incorporating theangular deviation and the effects of lateral shift, called “x angular deviation and the effects of lateral shift, called “x displacement”:displacement”: Iterative Expectation Maximization (EM). (Ref. L.J. Schultz, IEEE TRANSACTIONS ON IMAGE PROCESSING, VOL. 16, NO. 8, AUGUST 2007)

xx (or x displacement):(or x displacement):difference between the crossing point of the muon track in the lowerchamber and the extrapolation to the same chamber of the incoming track.

10/07/201210/07/2012 1212

MuMu--SteelSteel

Where is Lead?

13

FOUND!!!

10/07/2012 Mu-Steel