Milsted, J.; Friedman, A. M.; Stevens, C. M. (1965). "The alpha half-life of berkelium-247; a new long-lived isomer of berkelium-248". Nuclear Physics. 71 (2): 299. Bibcode:1965NucPh..71..299M. doi:10.1016/0029-5582(65)90719-4. "The isotopic analyses disclosed a species of mass 248 in constant abundance in three samples analysed over a period of about 10 months. This was ascribed to an isomer of Bk248 with a half-life greater than 9 [years]. No growth of Cf248 was detected, and a lower limit for the β− half-life can be set at about 104 [years]. No alpha activity attributable to the new isomer has been detected; the alpha half-life is probably greater than 300 [years]."
Dhiman, Deeksha; Vatsa, Rakhee; Sood, Ashwani (September 2022). "Challenges and opportunities in developing Actinium-225 radiopharmaceuticals". Nuclear Medicine Communications. 43 (9): 970–977. doi:10.1097/MNM.0000000000001594. PMID35950353.
Koniar, Helena; Rodríguez-Rodríguez, Cristina; Radchenko, Valery; Yang, Hua; Kunz, Peter; Rahmim, Arman; Uribe, Carlos; Schaffer, Paul (2022-09-12). "SPECT imaging of 226Ac as a theranostic isotope for 225Ac radiopharmaceutical development". Physics in Medicine and Biology. 67 (18). doi:10.1088/1361-6560/ac8b5f. ISSN1361-6560. PMID35985341.
Hagemann, French (1950). "The Isolation of Actinium". Journal of the American Chemical Society. 72 (2): 768–771. doi:10.1021/ja01158a033.
Dixon, W. R.; Bielesch, Alice; Geiger, K. W. (1957). "Neutron Spectrum of an Actinium–Beryllium Source". Can. J. Phys. 35 (6): 699–702. Bibcode:1957CaJPh..35..699D. doi:10.1139/p57-075.
Milsted, J.; Friedman, A. M.; Stevens, C. M. (1965). "The alpha half-life of berkelium-247; a new long-lived isomer of berkelium-248". Nuclear Physics. 71 (2): 299. Bibcode:1965NucPh..71..299M. doi:10.1016/0029-5582(65)90719-4. "The isotopic analyses disclosed a species of mass 248 in constant abundance in three samples analysed over a period of about 10 months. This was ascribed to an isomer of Bk248 with a half-life greater than 9 [years]. No growth of Cf248 was detected, and a lower limit for the β− half-life can be set at about 104 [years]. No alpha activity attributable to the new isomer has been detected; the alpha half-life is probably greater than 300 [years]."
Dixon, W. R.; Bielesch, Alice; Geiger, K. W. (1957). "Neutron Spectrum of an Actinium–Beryllium Source". Can. J. Phys. 35 (6): 699–702. Bibcode:1957CaJPh..35..699D. doi:10.1139/p57-075.
Dhiman, Deeksha; Vatsa, Rakhee; Sood, Ashwani (September 2022). "Challenges and opportunities in developing Actinium-225 radiopharmaceuticals". Nuclear Medicine Communications. 43 (9): 970–977. doi:10.1097/MNM.0000000000001594. PMID35950353.
Koniar, Helena; Rodríguez-Rodríguez, Cristina; Radchenko, Valery; Yang, Hua; Kunz, Peter; Rahmim, Arman; Uribe, Carlos; Schaffer, Paul (2022-09-12). "SPECT imaging of 226Ac as a theranostic isotope for 225Ac radiopharmaceutical development". Physics in Medicine and Biology. 67 (18). doi:10.1088/1361-6560/ac8b5f. ISSN1361-6560. PMID35985341.
Koniar, Helena; Rodríguez-Rodríguez, Cristina; Radchenko, Valery; Yang, Hua; Kunz, Peter; Rahmim, Arman; Uribe, Carlos; Schaffer, Paul (2022-09-12). "SPECT imaging of 226Ac as a theranostic isotope for 225Ac radiopharmaceutical development". Physics in Medicine and Biology. 67 (18). doi:10.1088/1361-6560/ac8b5f. ISSN1361-6560. PMID35985341.