In accordance with the general principles of prevention set out in Article L. 4121-2 of this Code and the general principles of personal radiation protection set out in Articles L. 1333-2 and L. 1333-3 of the Public Health Code, the employer shall take preventive measures to eliminate or reduce to a minimum the risks resulting from exposure to ionising radiation, taking into account technical progress and the availability of measures to control the risk at source.