Plutonium-241

Properties and data of the isotope ²⁴¹Pu.

Contents

General data

Name of the isotope:Plutonium-241; Pu-241Symbol:²⁴¹Pu or 24194PuMass number A:241 (= number of nucleons)Atomic number Z:94 (= number of protons)Neutrons N:147Isotopic mass:241.0568497(12) u (atomic weight of Plutonium-241)Nuclide mass:241.0052902 u (calculated nuclear mass without electrons)Mass excess:52.95515 MeVMass defect:1.95244596 u (per nucleus)Nuclear binding energy:1818.69169706 MeV (per nucleus)
7.54643858 MeV (average binding energy per nucleon)Separation energy:S_N = 5.24152(3) MeV (first neutron)
S_P = 6.65(17) MeV (first proton)Half-life:14.329(29) aDecay constant λ:1.533920923280 × 10^-9 s^-1Specific activity α:3832982517842.5 Bq g^-1
103.59412210385 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2+Magnetic dipole moment:μ(μ_N) = - 0.683(15)Quadrupole moment Q:+6(2) barn (100 fm²)Nuclear g-factor:g_l = -0.2732Charge radius:5.8748(379) femtometer fmYear of discovery:1949

Radioactive Decay

Half-life T_½ = 14.329(29) a respectively 4.51879344 × 10⁸ seconds s.

Decay mode	Daughter	Probability	Decay energy
α	²³⁷U	trace	5.1401(5) MeV
SZ	^div	trace
β^-	²⁴¹Am	99.998 %	0,02078(17) MeV

Parent Nuclides

Direct parent isotopes are: ²⁴¹Np, ²⁴⁵Cm.

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^241m1Pu	161.6853(9) keV	0.88(5) μs	1/2+
^241m2Pu	2200 keV	20.5(22) μs

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 147) and isobaric (same nucleon number A = 241) with Plutonium-241. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 147	Isobar A = 241
89	²³⁶Ac
90	²³⁷Th
91	²³⁸Pa
92	²³⁹U	²⁴¹U
93	²⁴⁰Np	²⁴¹Np
94	²⁴¹Pu	²⁴¹Pu
95	²⁴²Am	²⁴¹Am
96	²⁴³Cm	²⁴¹Cm
97	²⁴⁴Bk	²⁴¹Bk
98	²⁴⁵Cf	²⁴¹Cf
99	²⁴⁶Es	²⁴¹Es
100	²⁴⁷Fm	²⁴¹Fm
101	²⁴⁸Md