Isotopes of plutonium

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Plutonium (Pu) has no stable isotopes. A standard atomic mass cannot be given.

[edit] Table

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
nuclide symbol	excitation energy			half-life	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
²²⁸Pu	94	134	228.03874(3)	1.1(+20-5) s	0+
²²⁹Pu	94	135	229.04015(6)	120(50) s	3/2+#
²³⁰Pu	94	136	230.039650(16)	1.70(17) min	0+
²³¹Pu	94	137	231.041101(28)	8.6(5) min	3/2+#
²³²Pu	94	138	232.041187(19)	33.7(5) min	0+
²³³Pu	94	139	233.04300(5)	20.9(4) min	5/2+#
²³⁴Pu	94	140	234.043317(7)	8.8(1) h	0+
²³⁵Pu	94	141	235.045286(22)	25.3(5) min	(5/2+)
²³⁶Pu	94	142	236.0460580(24)	2.858(8) a	0+
²³⁷Pu	94	143	237.0484097(24)	45.2(1) d	7/2-
^237m1Pu	145.544(10) keV			180(20) ms	1/2+
^237m2Pu	2900(250) keV			1.1(1) µs
²³⁸Pu	94	144	238.0495599(20)	87.7(1) a	0+
²³⁹Pu	94	145	239.0521634(20)	24.11(3)E+3 a	1/2+
^239m1Pu	391.584(3) keV			193(4) ns	7/2-
^239m2Pu	3100(200) keV			7.5(10) µs	(5/2+)
²⁴⁰Pu	94	146	240.0538135(20)	6561(7) a	0+
²⁴¹Pu	94	147	241.0568515(20)	14.290(6) a	5/2+
^241m1Pu	161.6(1) keV			0.88(5) µs	1/2+
^241m2Pu	2200(200) keV			21(3) µs
²⁴²Pu	94	148	242.0587426(20)	3.75(2)E+5 a	0+
²⁴³Pu	94	149	243.062003(3)	4.956(3) h	7/2+
^243mPu	383.6(4) keV			330(30) ns	(1/2+)
²⁴⁴Pu	94	150	244.064204(5)	8.00(9)E+7 a	0+
²⁴⁵Pu	94	151	245.067747(15)	10.5(1) h	(9/2-)
²⁴⁶Pu	94	152	246.070205(16)	10.84(2) d	0+
²⁴⁷Pu	94	153	247.07407(32)#	2.27(23) d	1/2+#

[edit] Notes

Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

[edit] References

Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005).
Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
- Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
- David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.