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The 4n+3 chain of uranium-235 is commonly called the "actinium series" or "actinium cascade". Beginning with the naturally-occurring isotope uranium-235, this decay series includes the following elements: actinium, astatine, bismuth, francium, lead, polonium, protactinium, radium, radon, thallium, and thorium. All are present, at least ...
The actinium isotope 227 Ac is a transient member of the uranium-actinium series decay chain, which begins with the parent isotope 235 U (or 239 Pu) and ends with the stable lead isotope 207 Pb. The isotope 228 Ac is a transient member of the thorium series decay chain, which begins with the parent isotope 232 Th and ends with the stable lead ...
Actinium-225 (225 Ac, Ac-225) is an isotope of actinium. It undergoes alpha decay to francium-221 with a half-life of 10 days, and is an intermediate decay product in the neptunium series (the decay chain starting at 237 Np). Except for minuscule quantities arising from this decay chain in nature, 225 Ac is entirely synthetic.
[12] [13] [14] Actinium-225 undergoes a series of three alpha decays – via the short-lived francium-221 and astatine-217 – to 213 Bi, which itself is used as an alpha source. [15] Another benefit is that the decay chain of 225 Ac ends in the nuclide 209 Bi, [note 1] which has a considerably shorter biological half-life than lead.
Uranium-235 (235 U or U-235) is an isotope of uranium making up about 0.72% of natural uranium.Unlike the predominant isotope uranium-238, it is fissile, i.e., it can sustain a nuclear chain reaction.
[26] [27] The decay chain of 233 U itself is part of the neptunium series, the decay chain of its grandparent 237 Np. Uses for uranium-233 include the production of the medical isotopes actinium-225 and bismuth-213 which are among its daughters, low-mass nuclear reactors for space travel applications, use as an isotopic tracer , nuclear weapons ...
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English: Decay chain 4n+3: Actinium series. Dashed arrow is a decay mode with < 1% probability. Dashed arrow is a decay mode with < 1% probability. Dotted arrows are decay modes with < 0.01% probability.