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MICOS a CHERNE collaboration in applied research involving industry

MICOS a CHERNE collaboration in applied research involving industry. François Tondeur, Lara Marwaha, Isabelle Gerardy, Jonathan Baré ISIB José Rodenas, Sergio Gallardo UPV. MICOS miniaturisation of the Compton spectrometer. PRINCIPLE

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MICOS a CHERNE collaboration in applied research involving industry

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  1. MICOSa CHERNE collaboration in applied research involving industry François Tondeur, Lara Marwaha, Isabelle Gerardy, Jonathan Baré ISIB José Rodenas, Sergio Gallardo UPV

  2. MICOSminiaturisation of the Compton spectrometer • PRINCIPLE Measurement on the scattered X-ray beam to avoid detector saturation

  3. The Compton spectrometer in the 1990’s • Matscheko et alRTI Electronics A big, heavy device adapted to a Ge detector

  4. The Compton spectrometerin CHERNE • UP Valencia: Gallardo, Rodenas, Verdu Monte Carlo simulation of the Compton scattering technique applied to characterize diagnostic X-ray spectra • U. Bologna: Fernandez, Scot, Baré et al Reconstruction of the X-ray tube spectrum from a scattering measurement • ISIB Bruxelles: Marwaha, Tondeur et al present work

  5. Development of a small portable device for routine spectrometric controls of X-ray generators 4-year FIRST project supported by the Walloon region 2008-2012 Industrial cooperation with Balteau NDT and Canberra Benelux Academic collaboration with UP Valencia MICOS

  6. MICOS partnership • Project coordinated by ISIB, and executed at ISIB lab of nuclear and radiation physics research fellow: Lara Marwaha (ex-FHA) • UPV: training of the research fellow to MC simulation and to the « old » spectrometer • Balteau: manufacturer of the shielding + sales in the industrial sector • Canberra: provided detectors for the project + sales in the medical sector

  7. MICOS main steps • Design of a simplified shielding • Tests of detectors and choice of a detector • MC simulation and validation • Choice of the methodology for unfolding

  8. Shielding design • 3 options according to energy : maximum 150, 300 or 450 keV • Design with MC simulation • Steel/lead/copper for 150 kV and 300 kV • 450 kV: W cover above the 300 kV device

  9. Choice of the detector • Limited choice of « pen-type » detectors diam.<20 mm, reasonable cost • Tested : CZT, CdTe, NaI • CZT- CdTe: not easy to simulate with MC(problems with dead layers, variability from one detector to another, response depending on electronics settings…) • Choice: NaI – easy to simulate with MC

  10. Monte Carlo simulation • Geometrical model validated with radioactive sources: 241Am, 109Cd, 57Co, 137Cs thickness of front window fitted to experimental data • Response matrix of 150 keV prototype calculated with 1 keV interval

  11. Deconvolution • A specific algorithm similar to GRAVEL gives good results in few iterations sensitive to good energy calibration

  12. MICOS going on • 300/450 keV prototype soon manufactured simulation-validation-unfolding-testing • Back to CZT/CdTe improve the geometrical model and the simulation of the response • Students from CHERNE welcome for a master thesis

  13. Thank you

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