Isotopes of plutonium (₉₄Pu)

Main isotopes[1] Decay abun­dance half-life (t1/2) mode pro­duct 238Pu trace 87.7 y[2] α 234U SF – 239Pu trace 2.411×104 y α 235U SF – 240Pu trace 6.561×103 y α 236U SF – 241Pu synth 14.329 y β− 241Am α 237U SF – 242Pu synth 3.75×105 y α 238U SF – 244Pu trace 8.00×107 y α 240U SF –

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Plutonium (₉₄Pu) is an artificial element, except for trace quantities resulting from neutron capture by uranium, and thus a standard atomic weight cannot be given. Like all artificial elements, it has no stable isotopes. It was synthesized long before being found in nature, the first isotope synthesized being plutonium-238 in 1940. Twenty plutonium radioisotopes have been characterized. The most stable are plutonium-244 with a half-life of 80.8 million years; plutonium-242 with a half-life of 373,300 years; and plutonium-239 with a half-life of 24,110 years; and plutonium-240 with a half-life of 6,560 years. This element also has eight meta states; all have half-lives of less than one second.

Isotopes of plutonium range in atomic weight from 228.0387 u (²²⁸Pu) to 247.074 u (²⁴⁷Pu). The primary decay modes before the most stable isotope, ²⁴⁴Pu, are spontaneous fission and alpha decay; the primary mode after is beta emission. The primary decay products before ²⁴⁴Pu are isotopes of uranium and neptunium (not considering fission products), and the primary decay products after are isotopes of americium.

List of isotopes

Zdroj:https://en.wikipedia.org?pojem=Isotopes_of_plutonium
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Nuclide [n 1]	Z	N	Isotopic mass (Da) [n 2][n 3]	Half-life	Decay mode [n 4]	Daughter isotope [n 5][n 6]	Spin and parity [n 7][n 8]	Isotopic abundance
	Excitation energy
228Pu	94	134	228.03874(3)	1.1+20 −5 s	α	224U	0+
					β+ (rare)	228Np
229Pu[3]	94	135	229.04015(6)	91(26) s	α (50%)	225U	3/2+#
					β+ (50%)	229Np
230Pu	94	136	230.039650(16)	1.70(17) min	α (>73%)[4]	226U	0+
					β+ (<27%)	230Np
231Pu[5]	94	137	231.041101(28)	8.6(5) min	β+ (87%)	231Np	(3/2+)
					α (13%)	227U
232Pu	94	138	232.041187(19)	33.7(5) min	EC (89%)	232Np	0+
					α (11%)	228U
233Pu	94	139	233.04300(5)	20.9(4) min	β+ (99.88%)	233Np	5/2+#
					α (.12%)	229U
234Pu	94	140	234.043317(7)	8.8(1) h	EC (94%)	234Np	0+
					α (6%)	230U
235Pu	94	141	235.045286(22)	25.3(5) min	β+ (99.99%)	235Np	(5/2+)
					α (.0027%)	231U
236Pu	94	142	236.0460580(24)	2.858(8) y	α	232U	0+
					SF (1.37×10−7%)	(various)
					CD (2×10−12%)	208Pb 28Mg
237Pu	94	143	237.0484097(24)	45.2(1) d	EC	237Np	7/2−
					α (.0042%)	233U
237m1Pu	145.544(10)2 keV			180(20) ms	IT	237Pu	1/2+
237m2Pu	2900(250) keV			1.1(1) μs
238Pu	94	144	238.0495599(20)	87.7(1) y	α	234U	0+	Trace[n 9]
					SF (1.9×10−7%)	(various)
					CD (1.4×10−14%)	206Hg 32Si
					CD (6×10−15%)	180Yb 30Mg 28Mg
239Pu[n 10][n 11]	94	145	239.0521634(20)	2.411(3)×104 y	α	235U	1/2+	Trace[n 12]
					SF (3.1×10−10%)	(various)
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)	6.561(7)×103 y	α	236U	0+	Trace[n 13]
					SF (5.7×10−6%)	(various)
					CD (1.3×10−13%)	206Hg 34Si
241Pu[n 10]	94	147	241.0568515(20)	14.290(6) y	β− (99.99%)	241Am	5/2+
					α (.00245%)	237U
					SF (2.4×10−14%)	(various)
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)×105 y	α	238U	0+
					SF (5.5×10−4%)	(various)
243Pu[n 10]	94	149	243.062003(3)	4.956(3) h	β−	243Am	7/2+
243mPu	383.6(4) keV			330(30) ns			(1/2+)
244Pu	94	150	244.064204(5)	8.00(9)×107 y	α (99.88%)	240U	0+	Trace[n 14]
					SF (.123%)	(various)
					β−β− (<7.3×10−9%)	244Cm
245Pu	94	151	245.067747(15)	10.5(1) h	β−	245Am	(9/2−)
246Pu	94	152	246.070205(16)	10.84(2) d	β−	246mAm	0+