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TROCMÉ Mathieu

Dernière mise à jour jeudi 25 février 2010, par Nicolas Busser

TROCMÉ Mathieu

Institut Pluridisciplinaire Hubert Curien - IPHC
Département de Recherches Subatomiques - DRS

Centre National de la Recherche Scientifique - CNRS
UMR 7178 CNRS/Université De Strasbourg - UDS

23 rue du loess, 67037 Strasbourg cedex 2, France

Contact : Mathieu TROCMÉ

Titre de la thèse : Étude d’une nouvelle génération de dosimètres actifs neutrons à base de capteurs CMOS

Période : 2005-2009

Encadrant(s) : Abdel-Mjid NOURREDDINE, Daniel HUSSON


The IPHC (Institut Pluridisciplinaire Hubert Curien) of Strasbourg is one of the world leaders in the design of CMOS active pixel sensors for HEP experiments.
These one-megapixel detectors have been tailored to show numerous advantages :
high efficiency for charged particles (> 99%),
high spatial resolution (σxy < 2 µm),
high speed (freadout ≈ 20 MHz/pix),
radiation hardened behaviour (Φ ≈ 1013 n1MeV/cm2),
low power consumption (standard electronics, < 5 V)
and low cost (standard industrial process).
Concerned by dosimetric applications, the RaMsEs (Radioprotection et Mesures Environnementales) group of the IPHC
is exploring the possibility of using these sensors in the radiation protection field.

The first device developed at RaMsEs was the AlphaRad, a highly efficient System-On-Chip
designed for 222Radon monitoring (European Patent EP1416295).
Since thermal neutrons can be detected through α- and 3H-producing reactions,
we are now working on a new integrated device for neutron dosimetry, referred to as the DOSIPIX-N.
One of the most attractive features of this sensor is its almost natural γ-transparency,
which results from its pixelated structure and from the thinness of its active layer (≈ 10 µm).

Fast neutrons being the most dangerous in terms of dose, first experiments were undertaken with high energy calibrated neutron sources and beams
and hydrogen-rich radiators at the IPHC and at the Institute for Radiological Protection and Nuclear Safety (IRSN), Cadarache, France.
The detection of thermal neutrons was also investigated with a set of LCP radiators and thermalized sources (AmBe+CH2, Cf+D2O±Cd).
Different sensors were characterized with photons, electrons, protons and α-particles.
The overall experimental results are in good agreements with both calculations and Monte Carlo simulations (GEANT4 and MCNPX).

This work aims to pave the way for a future cheap portable γ-transparent neutron dosemeter.

Keywords : CMOS Active Pixel Sensor, neutron dosimetry, γ-transparency, Van de Graaff, MCNPX, GEANT4, CAD

Publications / Communications


  • « Comparison of experimental and simulated response of PN3 and Neutrak dosemeters to fast neutrons »
    M. Trocmé, E. Baussan, A. Belafrites, M. Vanstalle, T.D. Lê, A. Nourreddine
    Radiation Measurements, under review, 2009
    Proceedings of ICNTS 24, 24th International Conference on Nuclear Tracks in Solids, Bologna, Italy, September 1-5, 2008


  • « DOSIPIX-N, Towards a CMOS Active Pixel Sensor Neutron Dosemeter »
    M. Trocmé, E. Baussan, S. Higueret, D. Husson, T.D. Lê, A. Nourreddine, M. Vanstalle
    IEEE Nuclear Science Symposium 2008, Dresden, Germany, October 19-25, 2008
  • « Dosimétrie et radioprotection au RaMsEs »
    M. Trocmé, M.R. Mesradi
    IPHC PhD Student Day, Strasbourg, France, January 31, 2008
  • « Développement d’un dosimètre électronique neutron à base de capteurs CMOS »
    M. Trocmé
    Young researchers’ meeting, Les Houches, France, January 8-12, 2007
  • « Development of a CMOS based real-time neutron dosemeter »
    M. Trocmé
    Joliot-Curie Summer School on the nuclear fuel cycle, Maubuisson, France, September 18-23, 2006


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