Nuklida · radioaktif
Aktinium-225 (²²⁵Ac)
Aktinium-225 (²²⁵Ac) adalah isotop radioaktif aktinium dengan 89 proton dan 136 neutron (nomor massa 225). Waktu paruhnya 9,919 hari (± 0,0021 hari), meluruh terutama lewat peluruhan alfa (α).
Data nuklida
- Nomor massa (A)
- 225
- Proton (Z)
- 89
- Neutron (N)
- 136
- Massa atom
- 225.023228601 ± 0.000005107 u
- Waktu paruh
- 9,919 hari (± 0,0021 hari)
- Mode peluruhan
- Peluruhan alfa (α) ( 100 %)
- Inti anak
- Fransium-221 (²²¹Fr)
- Tahun penemuan
- 1947
- Sumber data
- IAEA Atomic Mass Data Center (NUBASE) and IUPAC CIAAW, via PubChem
Kegunaan isotop aktinium
- 225Ac (with a half-life of 10 days) can be used in cancer treatments (Fig. IUPAC.89.1). The isotope is attached to a chelating agent (a substance that can form multiple bonds to a single metal ion) and delivered to the problem site. The emissions of alpha particles from actinium and its daughter products cause tumor death. 225Ac in a series of alpha decays produces 213Bi (with a half-life of 0.76 h), which is also used for radioimmunotherapy.
- 225Ac, which is a pure alpha emitter, is used to produce 213Bi with an 225Ac/ 213Bi radionuclide generator (Fig. IUPAC.89.2). 213Bi is a mixed alpha and beta emitter. The primary mode of decay is by beta emission to the very short-lived, alpha emitter 213Po. The 8.4 MeV alpha particle emitted by 213Po has a path length of 76 μm in human tissue and is responsible for its cytotoxic effects.
Isotop aktinium lainnya
²⁰⁵Ac, ²⁰⁶Ac, ²⁰⁷Ac, ²⁰⁸Ac, ²⁰⁹Ac, ²¹⁰Ac, ²¹¹Ac, ²¹²Ac, ²¹³Ac, ²¹⁴Ac, ²¹⁵Ac, ²¹⁶Ac, ²¹⁷Ac, ²¹⁸Ac, ²¹⁹Ac, ²²⁰Ac, ²²¹Ac, ²²²Ac, ²²³Ac, ²²⁴Ac, ²²⁶Ac, ²²⁷Ac, ²²⁸Ac, ²²⁹Ac, ²³⁰Ac, ²³¹Ac, ²³²Ac, ²³³Ac, ²³⁴Ac, ²³⁵Ac, ²³⁶Ac, ²³⁷Ac