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Uran-Actinium-Zerfallsreihe f
nucl.phys., радиоакт.	4n + 3 series; uranium-actinium radioactive series; uranium-actinium series; actinium family; actinium radioactive family; radioactive family of actinium; 4n + 3 family; uranium-actinium family; uranium-actinium radioactive family; radioactive family of uranium-actinium
радиоакт.	actinium radioactive series