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

2. MICOS miniaturisation 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 al RTI Electronics A big, heavy device adapted to a Ge detector

4. The Compton spectrometer in 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. MICOS 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

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

10. 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

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

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

14. 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

15. Thank you