When, in application ofArticle R. 1333-94 of the Public Health Code, the representative of the State in the département delimits the zones in which, due to a radiological emergency, measures to reduce exposure to ionising radiation may be prescribed, the employer shall assess, in accordance with the provisions of Section 4, the risks associated with situations of long-term exposure to radiation for workers present in these zones and shall implement for their benefit the preventive measures provided for in this chapter.