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...e 19th and 20th centuries with the realization that [[ionizing radiation]] from natural and artificial sources can have harmful effects on living organisms ...z.html Abteilung Strahlenschutz]. In: Bundesamt für Gesundheit''. Archived from [https://redirecter.toolforge.org/?url=https%3A%2F%2Fwww.bag.admin.ch%2Fbag ...