Periodic Table/Californium/²⁴⁰Cf

← 239Cf241Cf →

²⁴⁰Cf

Californium-240

Radioactive· Half-life: 40.3 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

98

Neutrons (N)

142

Mass Number (A)

240

Atomic Mass

240.062253AMU

Spin / Parity

0+

Binding E/A

7.302keV

Natural Abundance

Trace / None

Half-life

40.3 s

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

α

98.5%

SF

1.5%

β⁺

Decay Chain

²⁴⁰CfCalifornium40.3 s

α98.5%

β⁺²⁴⁰Bk

²³⁶CmCurium6.80 min

β⁺82.0%

α²³²Pu18.0%

²³⁶AmAmericium3.60 min

β⁺100.0%

α²³²Np4.00%

²³⁶PuPlutonium2.86 y

α100.0%

28Mg²⁰⁸Pb2.00%

2β⁺²³⁶U

²³²UUranium68.9 y

α100.0%

24Ne²⁰⁸Pb8.90%

28Mg²⁰⁴Hg5.00%

²²⁸ThThorium1.91 y

α100.0%

20O²⁰⁸Pb1.13%

²²⁴RaRadium3.63 d

α100.0%

¹⁴C²¹⁰Pb4.00%

²²⁰RnRadon55.6 s

α100.0%

2β⁻²²⁰Ra

²¹⁶PoPolonium144 ms

α100.0%

2β⁻²¹⁶Rn

²¹²PbLead10.6 h

β⁻100.0%

²¹²BiBismuth1.01 h

β⁻64.1%

α²⁰⁸Tl35.9%

β⁻α²⁰⁸Pb0.01%

²¹²PoPolonium294 ns

α100.0%

²⁰⁸PbLeadSTABLE

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

Other Isotopes of Californium

237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256

← Back to CaliforniumData: IAEA NDS · ENSDF