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Nuclear Technology Centre


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EMR is an acronym for Electron Magnetic Resonance, other common names are EPR (Electron Paramagnetic Resonance) and ESR (Electron Spin Resonance). We use alanine pellets to measure the radiation dose. When ionizing radiation interacts with alanine, unpaired electrons are created which show a high stability in time. The amount of unpaired electrons created is proportional to the radiation dose received which can be measured with an EMR spectrometer. 

What can we do?

  • Radiotherapy dosimetry
  • Transfer dosimetry programs for quality assurance

Our Equipment


We use a Bruker EMXmicro spectrometer with a 9 inch magnet, equipped with a high-sensitivity resonator ER4119HS-W1.



The uncertainty on the detectors is 1 % (k=1) for irradiated pellets of 4 Gy. 


M. Anton: Development of a secondary standard for the absorbed dose to water based on the alanine EPR
dosimetry system, Appl. Radiat. Isot. 62, p. 779 – 95, 2005

M. Anton, Uncertainties in alanine/ ESR dosimetry at the Physikalisch-Technische Bundesanstalt, Phys.
Med. Biol., Vol 51, pp 5419-5440, 2006.