Abstract
The French Institute for Radiation protection and Nuclear Safety (IRSN) is providing reference neutron fluence energy distribution at its standard monoenergetic neutron fields, produced at the AMANDE facility. The neutron energy is assessed by measuring the recoil nuclei energy in a μTPC detector, the LNE-IRSN/MIMAC detector. The knowledge of the ionization quenching factor (IQF) is fundamental to determine the kinetic energy of the recoil nuclei. For some various gases and pressures, discrepancies of about 15% were observed between IQF calculations using the SRIM software and experimental measurements. No data are available for the iC4H10 + 50% CHF3 gas mixture which are used for measurements from a few keV up to 565 keV neutron energies in the μTPC detector. The experimental determination of the IQF is of primary importance to provide reference neutron fluence energy distribution. After a short description of the experimental set-up, this paper presents the first results of the IQF measurements in a iC4H10 + 50% CHF3 gas mixture in the energy range 1 keV – 25 keV.
Highlights
The Laboratory for Neutron Metrology and Neutron Dosimetry (LMDN) of the French Institute for Radiation protection and Nuclear Safety (IRSN), is equipped with several neutron facilities
As an associated laboratory to the French National Metrological Institute (LNE), the LMDN has to develop, improve, and maintain the reference quantities associated to its standard neutron fields
The laboratory has undergone the development of a recoil nuclei-based gas spectrometer, called LNE-IRSN/MIMAC [2], (MIcro-tpc MAtrix of Chambers) in order to provide reference values of the neutron fluence, and neutron fluence energy distribution in the energy range of a few keV up to 5 MeV
Summary
As an associated laboratory to the French National Metrological Institute (LNE), the LMDN has to develop, improve, and maintain the reference quantities associated to its standard neutron fields. The laboratory has undergone the development of a recoil nuclei-based gas spectrometer, called LNE-IRSN/MIMAC [2], (MIcro-tpc MAtrix of Chambers) in order to provide reference values of the neutron fluence, and neutron fluence energy distribution in the energy range of a few keV up to 5 MeV. The measured energy in the detector does not correspond to the kinetic energy of the recoil nuclei To assess this quantity, the Ionization Quenching Factor (IQF) has to be determined. The IQF, which is the ratio of the ionization energy and the kinetic energy (Eq 1), depends on the gas mixture, the pressure, and the energy of the recoil nuclei,. To perform experimental measurements of the IQF the LPSC has developed a dedicated facility, called COMIMAC [10]
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