l 1 - infn sezione di padova...incoming muons muon detectors small angle scattering large angle...
TRANSCRIPT
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