1.1.2 Neutron activation Neutron activation consists in irradiating a sample with a flux of neutrons to activate the atoms in the sample. The number and the energy of the gamma photons emitted by the sample in response to the neutrons received are analysed. The information collected is used to determine the concentration of atoms in the analysed material. This technology is used in archaeology to characterise ancient objects, in geochemistry for mining prospecting and in industry (study of the composition of semiconductors, analysis of raw mixes in cement works). Given the activation of the analysed material, this requires particular vigilance with regard to the nature of the objects analysed. Articles R. 1333-2 and R. 1333-3 of the Public Health GRAPH Breakdown of notifications for sealed radioactive sources 1B 0 500 1,000 1,500 2,000 2,500 3,000 2019 2020 2021 Atmospheric dust measurement Elimination of static electricity Smoke detectors Calibration Teaching Chromatography Electron capture detectors X-ray fluorescence analysis Electronic tubes with pre-ionisation Number of facilities with a notification acknowledgement GRAPH Breakdown of licenses or registrations for sealed radioactive sources 1A 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 0 100 200 300 400 500 600 700 800 X-ray fluorescence analysis Calibration Density measurement and weighing Thickness measurement Atmospheric dust measurement Thickness of thin layers Level measurement Paper weight measurement Humidity and density Diagraphy (logging) Elimination of static electricity Implementation of neutron sources Teaching Analysis Research Chromatography Electron capture detectors Gamma radiography 2017 Licenses 2018 Licenses 2019 Licenses 2020 Licenses 2021 Licenses 2021 Registrations 11 8 8 7 7 10 4 Number of facilities licensed or registered USE OF SEALED RADIOACTIVE SOURCES BY END-PURPOSE ASN Report on the state of nuclear safety and radiation protection in France in 2021 235 08 – SOURCES OF IONISING RADIATION AND THEIR INDUSTRIAL, VETERINARY AND RESEARCH APPLICATIONS 08 07 13 04 10 06 12 14 03 09 05 11 02 AP 01
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