Overseas départements and regions The regulation of radiation protection and the transport of radioactive substances in the 5 overseas départements and regions (Guadeloupe, Martinique, Guyane, La Réunion and Mayotte) and in certain overseas collectivities is ensured by the Paris division. It also acts as an expert to the competent authorities of Nouvelle‑Calédonie and French Polynesia. ASNR is also involved in radiological monitoring of these areas. In 2025, 20 inspections were carried out in the small-scale nuclear activities sector in the French‑Overseas départements, regions and collectivities. Five on-site inspection campaigns were carried out by ASNR. No significant radiation protection event in the small-scale nuclear activities classified as level 1 or higher on the International Nuclear and Radiological Events Scale (INES scale)(1), or level 2 or higher on the ASN-SFRO scale, was reported to ASNR in 2025. 20 inspections 0 significant event on a level greater than or equal to 1 on the INES(1) scale 0 significant event of level 2 or higher on the ASN-SFRO scale In 2023 and 2024, ASNR continued the radiological supervision of the environment of the seven representative islands of French Polynesia (five high islands and two atolls) that it has been monitoring regularly since 1998, supplemented by an additional high island, Bora-Bora (Society archipelago) and an atoll, Takapoto (Tuamotu archipelago). The 302 samples taken came from a variety of environments (atmospheric, terrestrial and marine) with which people may come into contact, including foodstuffs from the open sea, lagoons and terrestrial environments. The ASNR report, published in October 2025, presents these new measurement campaigns, which confirm the stability of the levels of artificial residual radioactivity detectable in the Polynesian environment, continuing the trend of recent years. These measurements are at very low levels and are mainly attributable to caesium-137 (137Cs). The total annual effective dose for an adult living in Tahiti resulting from all sources of radiation, natural and artificial, is estimated at around 1.7 mSv, excluding medical exposure. It is almost entirely attributable to cosmic radiation and natural radioactive elements, with less than 0.1% of this dose due to radioactivity of artificial origin resulting from French and international nuclear tests. This annual effective dose due to natural radioactivity for a Polynesian adult is lower than the average annual effective dose worldwide, estimated at 3 mSv, where exposure to radon predominates, as it is less abundant in the air in French Polynesia. THE INSTALLATIONS AND ACTIVITIES TO REGULATE COMPRISE: ▸ small-scale nuclear activities in the medical sector: • 5 external beam radiotherapy departments, • 1 brachytherapy department, • 5 nuclear medicine departments, • 25 centres practising fluoroscopy-guided interventional procedures; ▸ small-scale nuclear activities in the industrial, veterinary and research sectors: • 1 industrial radiology company using gamma radiography devices; ▸ activities associated with the transport of radioactive substances. Chap.7 Chap 6 Chap.5 1. An ESR that occurred in 2025 is currently being investigated, but had not been definitively classified at the time this report was published. It could be classified as level 1. ABSTRACTS – ASNR Report on the state of nuclear safety and radiation protection in France in 2025 57
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