Periodic Table/Americium/²³⁷Am

← 236Am238Am →

²³⁷Am

Americium-237

Radioactive· Half-life: 1.23 h

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

95

Neutrons (N)

142

Mass Number (A)

237

Atomic Mass

237.049995AMU

Spin / Parity

5/2-

Binding E/A

7.356keV

Natural Abundance

Trace / None

Half-life

1.23 h

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

β⁺

100.0%

α

0.0%

Decay Chain

²³⁷AmAmericium1.23 h

β⁺100.0%

α²³³Np0.03%

²³⁷PuPlutonium45.6 d

EC100.0%

α²³³U0.00%

²³⁷NpNeptunium2.14 My

α100.0%

30Mg²⁰⁷Tl4.00%

²³³PaProtactinium27.0 d

β⁻100.0%

²³³UUranium159 ky

α100.0%

24Ne²⁰⁹Pb7.20%

28Mg²⁰⁵Hg1.30%

²²⁹ThThorium7.92 ky

α100.0%

²²⁵RaRadium14.8 d

β⁻100.0%

²²⁵AcActinium9.92 d

α100.0%

¹⁴C²¹¹Bi5.30%

²²¹FrFrancium4.80 min

α100.0%

¹⁴C²⁰⁷Tl8.80%

β⁻²²¹Ra0.00%

²¹⁷AtAstatine32.6 ms

α100.0%

β⁻²¹⁷Rn0.01%

²¹³BiBismuth45.6 min

β⁻97.9%

α²⁰⁹Tl2.09%

²¹³PoPolonium3.71 μs

α100.0%

²⁰⁹PbLead3.23 h

β⁻100.0%

²⁰⁹BiBismuth20100000000 Gy

α100.0%

²⁰⁵TlThalliumSTABLE

15-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