Periodic Table/Americium/²²⁹Am

← 228Am230Am →

²²⁹Am

Americium-229

Radioactive· Half-life: 1.80 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

95

Neutrons (N)

134

Mass Number (A)

229

Atomic Mass

229.045283AMU

Spin / Parity

5/2-

Binding E/A

7.351keV

Natural Abundance

Trace / None

Half-life

1.80 s

Decay Modesoverview · half-life · α · β⁻ · β⁺

α

100.0%

β⁺

Decay Chain

²²⁹AmAmericium1.80 s

α100.0%

β⁺²²⁹Pu

²²⁵NpNeptunium6.50 ms

α100.0%

β⁺²²⁵U

²²¹PaProtactinium5.90 μs

α100.0%

²¹⁷AcActinium69.0 ns

α100.0%

β⁺²¹⁷Ra

²¹³FrFrancium34.1 s

α99.4%

β⁺²¹³Rn0.56%

²⁰⁹AtAstatine5.42 h

β⁺96.1%

α²⁰⁵Bi3.90%

²⁰⁹PoPolonium124 y

α99.5%

β⁺²⁰⁹Bi0.45%

²⁰⁵PbLead17.0 My

EC100.0%

²⁰⁵TlThalliumSTABLE

9-step decay chain → stable · Primary path shown · branching ratios indicated

Other Isotopes of Americium

223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249

← Back to AmericiumData: IAEA NDS · ENSDF