Isotopes of lead

Isotopes of lead (₈₂Pb)
α	206Hg
Standard atomic weight Ar°(Pb)
	[206.14, 207.94]; 207.2±1.1 (abridged);
	view; talk; edit;

Lead (₈₂Pb) has four observationally stable isotopes: ²⁰⁴Pb, ²⁰⁶Pb, ²⁰⁷Pb, ²⁰⁸Pb. Lead-204 is entirely a primordial nuclide and is not a radiogenic nuclide. The three isotopes lead-206, lead-207, and lead-208 represent the ends of three decay chains: the uranium series (or radium series), the actinium series, and the thorium series, respectively; a fourth decay chain, the neptunium series, terminates with the thallium isotope ²⁰⁵Tl. The three series terminating in lead represent the decay chain products of long-lived primordial ²³⁸U, ²³⁵U, and ²³²Th. Each isotope also occurs, to some extent, as primordial isotopes that were made in supernovae, rather than radiogenically as daughter products. The fixed ratio of lead-204 to the primordial amounts of the other lead isotopes may be used as the baseline to estimate the extra amounts of radiogenic lead present in rocks as a result of decay from uranium and thorium. (See lead–lead dating and uranium–lead dating.)

Quick Facts Main isotopes, Decay ...

Close

The longest-lived radioisotopes are ²⁰⁵Pb with a half-life of 17.3 million years and ²⁰²Pb with a half-life of 52,500 years. A shorter-lived naturally occurring radioisotope, ²¹⁰Pb with a half-life of 22.2 years, is useful for studying the sedimentation chronology of environmental samples on time scales shorter than 100 years.^[5]

The relative abundances of the four stable isotopes are approximately 1.5%, 24%, 22%, and 52.5%, combining to give a standard atomic weight (abundance-weighted average of the stable isotopes) of 207.2(1). Lead is the element with the heaviest stable isotope, ²⁰⁸Pb. (The more massive ²⁰⁹Bi, long considered to be stable, actually has a half-life of 2.01×10¹⁹ years.) ²⁰⁸Pb is also a doubly magic isotope, as it has 82 protons and 126 neutrons.^[6] It is the heaviest doubly magic nuclide known. A total of 43 lead isotopes are now known, including very unstable synthetic species.

The four primordial isotopes of lead are all observationally stable, meaning that they are predicted to undergo radioactive decay but no decay has been observed yet. These four isotopes are predicted to undergo alpha decay and become isotopes of mercury which are themselves radioactive or observationally stable.

In its fully ionized state, the beta decay of isotope ²¹⁰Pb does not release a free electron; the generated electron is instead captured by the atom's empty orbitals.^[7]

Remove ads

More information Nuclide, Historic name ...

Nuclide ^{[n 1]}	Historic name	Z	N	Isotopic mass (Da)^[8] ^{[n 2]}^{[n 3]}	Half-life^[1]	Decay mode^[1] ^{[n 4]}	Daughter isotope ^{[n 5]}^{[n 6]}	Spin and parity^[1] ^{[n 7]}^{[n 8]}	Natural abundance (mole fraction)
Nuclide ^{[n 1]}	Historic name	Excitation energy^{[n 8]}			Half-life^[1]	Decay mode^[1] ^{[n 4]}	Daughter isotope ^{[n 5]}^{[n 6]}	Spin and parity^[1] ^{[n 7]}^{[n 8]}	Normal proportion^[1]	Range of variation
¹⁷⁸Pb		82	96	178.003836(25)	250(80) μs	α	¹⁷⁴Hg	0+
¹⁷⁸Pb		82	96	178.003836(25)	250(80) μs	β⁺?	¹⁷⁸Tl	0+
¹⁷⁹Pb		82	97	179.002(87)	2.7(2) ms	α	¹⁷⁵Hg	(9/2−)
¹⁸⁰Pb		82	98	179.997916(13)	4.1(3) ms	α	¹⁷⁶Hg	0+
¹⁸¹Pb		82	99	180.996661(91)	39.0(8) ms	α	¹⁷⁷Hg	(9/2−)
¹⁸¹Pb		82	99	180.996661(91)	39.0(8) ms	β⁺?	¹⁸¹Tl	(9/2−)
¹⁸²Pb		82	100	181.992674(13)	55(5) ms	α	¹⁷⁸Hg	0+
¹⁸²Pb		82	100	181.992674(13)	55(5) ms	β⁺?	¹⁸²Tl	0+
¹⁸³Pb		82	101	182.991863(31)	535(30) ms	α	¹⁷⁹Hg	3/2−
¹⁸³Pb		82	101	182.991863(31)	535(30) ms	β⁺?	¹⁸³Tl	3/2−
^183mPb		94(8) keV			415(20) ms	α	¹⁷⁹Hg	13/2+
						β⁺?	¹⁸³Tl
						IT?	¹⁸³Pb
¹⁸⁴Pb		82	102	183.988136(14)	490(25) ms	α (80%)	¹⁸⁰Hg	0+
¹⁸⁴Pb		82	102	183.988136(14)	490(25) ms	β⁺? (20%)	¹⁸⁴Tl	0+
¹⁸⁵Pb		82	103	184.987610(17)	6.3(4) s	β⁺ (66%)	¹⁸⁵Tl	3/2−
¹⁸⁵Pb		82	103	184.987610(17)	6.3(4) s	α (34%)	¹⁸¹Hg	3/2−
^185mPb^{[n 9]}		70(50) keV			4.07(15) s	α (50%)	¹⁸¹Hg	13/2+
^185mPb^{[n 9]}		70(50) keV			4.07(15) s	β⁺? (50%)	¹⁸⁵Tl	13/2+
¹⁸⁶Pb		82	104	185.984239(12)	4.82(3) s	β⁺? (60%)	¹⁸⁶Tl	0+
¹⁸⁶Pb		82	104	185.984239(12)	4.82(3) s	α (40%)	¹⁸²Hg	0+
¹⁸⁷Pb		82	105	186.9839108(55)	15.2(3) s	β⁺ (90.5%)	¹⁸⁷Tl	3/2−
¹⁸⁷Pb		82	105	186.9839108(55)	15.2(3) s	α (9.5%)	¹⁸³Hg	3/2−
^187mPb^{[n 9]}		19(10) keV			18.3(3) s	β⁺ (88%)	¹⁸⁷Tl	13/2+
^187mPb^{[n 9]}		19(10) keV			18.3(3) s	α (12%)	¹⁸³Hg	13/2+
¹⁸⁸Pb		82	106	187.980879(11)	25.1(1) s	β⁺ (91.5%)	¹⁸⁸Tl	0+
¹⁸⁸Pb		82	106	187.980879(11)	25.1(1) s	α (8.5%)	¹⁸⁴Hg	0+
^188m1Pb		2577.2(4) keV			800(20) ns	IT	¹⁸⁸Pb	8−
^188m2Pb		2709.8(5) keV			94(12) ns	IT	¹⁸⁸Pb	12+
^188m3Pb		4783.4(7) keV			440(60) ns	IT	¹⁸⁸Pb	(19−)
¹⁸⁹Pb		82	107	188.980844(15)	39(8) s	β⁺ (99.58%)	¹⁸⁹Tl	3/2−
¹⁸⁹Pb		82	107	188.980844(15)	39(8) s	α (0.42%)	¹⁸⁵Hg	3/2−
^189m1Pb		40(4) keV			50.5(21) s	β⁺ (99.6%)	¹⁸⁹Tl	13/2+
						α (0.4%)	¹⁸⁵Hg
						IT?	¹⁸⁹Pb
^189m2Pb		2475(4) keV			26(5) μs	IT	¹⁸⁹Pb	31/2−
¹⁹⁰Pb		82	108	189.978082(13)	71(1) s	β⁺ (99.60%)	¹⁹⁰Tl	0+
¹⁹⁰Pb		82	108	189.978082(13)	71(1) s	α (0.40%)	¹⁸⁶Hg	0+
^190m1Pb		2614.8(8) keV			150(14) ns	IT	¹⁹⁰Pb	10+
^190m2Pb		2665(50)# keV			24.3(21) μs	IT	¹⁹⁰Pb	(12+)
^190m3Pb		2658.2(8) keV			7.7(3) μs	IT	¹⁹⁰Pb	11−
¹⁹¹Pb		82	109	190.9782165(71)	1.33(8) min	β⁺ (99.49%)	¹⁹¹Tl	3/2−
¹⁹¹Pb		82	109	190.9782165(71)	1.33(8) min	α (0.51%)	¹⁸⁷Hg	3/2−
^191m1Pb		58(10) keV			2.18(8) min	β⁺ (99.98%)	¹⁹¹Tl	13/2+
^191m1Pb		58(10) keV			2.18(8) min	α (0.02%)	¹⁸⁷Hg	13/2+
^191m2Pb		2659(10) keV			180(80) ns	IT	¹⁹¹Pb	33/2+
¹⁹²Pb		82	110	191.9757896(61)	3.5(1) min	β⁺ (99.99%)	¹⁹²Tl	0+
¹⁹²Pb		82	110	191.9757896(61)	3.5(1) min	α (0.0059%)	¹⁸⁸Hg	0+
^192m1Pb		2581.1(1) keV			166(6) ns	IT	¹⁹²Pb	10+
^192m2Pb		2625.1(11) keV			1.09(4) μs	IT	¹⁹²Pb	12+
^192m3Pb		2743.5(4) keV			756(14) ns	IT	¹⁹²Pb	11−
¹⁹³Pb		82	111	192.976136(11)	4# min	β⁺?	¹⁹³Tl	3/2−#
^193m1Pb		93(12) keV			5.8(2) min	β⁺	¹⁹³Tl	13/2+
^193m2Pb		2707(13) keV			180(15) ns	IT	¹⁹³Pb	33/2+
¹⁹⁴Pb		82	112	193.974012(19)	10.7(6) min	β⁺	¹⁹⁴Tl	0+
¹⁹⁴Pb		82	112	193.974012(19)	10.7(6) min	α (7.3×10⁻⁶%)	¹⁹⁰Hg	0+
^194m1Pb		2628.1(4) keV			370(13) ns	IT	¹⁹⁴Pb	12+
^194m2Pb		2933.0(4) keV			133(7) ns	IT	¹⁹⁴Pb	11−
¹⁹⁵Pb		82	113	194.9745162(55)	15.0(14) min	β⁺	¹⁹⁵Tl	3/2-
^195m1Pb		202.9(7) keV			15.0(12) min	β⁺	¹⁹⁵Tl	13/2+
^195m1Pb		202.9(7) keV			15.0(12) min	IT?	¹⁹⁵Pb	13/2+
^195m2Pb		1759.0(7) keV			10.0(7) μs	IT	¹⁹⁵Pb	21/2−
^195m3Pb		2901.7(8) keV			95(20) ns	IT	¹⁹⁵Pb	33/2+
¹⁹⁶Pb		82	114	195.9727876(83)	37(3) min	β⁺	¹⁹⁶Tl	0+
¹⁹⁶Pb		82	114	195.9727876(83)	37(3) min	α (<3×10⁻⁵%)	¹⁹²Hg	0+
^196m1Pb		1797.51(14) keV			140(14) ns	IT	¹⁹⁶Pb	5−
^196m2Pb		2694.6(3) keV			270(4) ns	IT	¹⁹⁶Pb	12+
¹⁹⁷Pb		82	115	196.9734347(52)	8.1(17) min	β⁺	¹⁹⁷Tl	3/2−
^197m1Pb		319.31(11) keV			42.9(9) min	β⁺ (81%)	¹⁹⁷Tl	13/2+
^197m1Pb		319.31(11) keV			42.9(9) min	IT (19%)	¹⁹⁷Pb	13/2+
^197m2Pb		1914.10(25) keV			1.15(20) μs	IT	¹⁹⁷Pb	21/2−
¹⁹⁸Pb		82	116	197.9720155(94)	2.4(1) h	β⁺	¹⁹⁸Tl	0+
^198m1Pb		2141.4(4) keV			4.12(7) μs	IT	¹⁹⁸Pb	7−
^198m2Pb		2231.4(5) keV			137(10) ns	IT	¹⁹⁸Pb	9−
^198m3Pb		2821.7(6) keV			212(4) ns	IT	¹⁹⁸Pb	12+
¹⁹⁹Pb		82	117	198.9729126(73)	90(10) min	β⁺	¹⁹⁹Tl	3/2−
^199m1Pb		429.5(27) keV			12.2(3) min	IT	¹⁹⁹Pb	(13/2+)
^199m1Pb		429.5(27) keV			12.2(3) min	β⁺?	¹⁹⁹Tl	(13/2+)
^199m2Pb		2563.8(27) keV			10.1(2) μs	IT	¹⁹⁹Pb	(29/2−)
²⁰⁰Pb		82	118	199.971819(11)	21.5(4) h	EC	²⁰⁰Tl	0+
^200m1Pb		2183.3(11) keV			456(6) ns	IT	²⁰⁰Pb	(9−)
^200m2Pb		3005.8(12) keV			198(3) ns	IT	²⁰⁰Pb	12+)
²⁰¹Pb		82	119	200.972870(15)	9.33(3) h	β⁺	²⁰¹Tl	5/2−
^201m1Pb		629.1(3) keV			60.8(18) s	IT	²⁰¹Pb	13/2+
^201m1Pb		629.1(3) keV			60.8(18) s	β⁺?	²⁰¹Tl	13/2+
^201m2Pb		2953(20) keV			508(3) ns	IT	²⁰¹Pb	(29/2−)
²⁰²Pb		82	120	201.9721516(41)	5.25(28)×10⁴ y	EC	²⁰²Tl	0+
^202m1Pb		2169.85(8) keV			3.54(2) h	IT (90.5%)	²⁰²Pb	9−
^202m1Pb		2169.85(8) keV			3.54(2) h	β⁺ (9.5%)	²⁰²Tl	9−
^202m2Pb		4140(50)# keV			100(3) ns	IT	²⁰²Pb	16+
^202m3Pb		5300(50)# keV			108(3) ns	IT	²⁰²Pb	19−
²⁰³Pb		82	121	202.9733906(70)	51.924(15) h	EC	²⁰³Tl	5/2−
^203m1Pb		825.2(3) keV			6.21(8) s	IT	²⁰³Pb	13/2+
^203m2Pb		2949.2(4) keV			480(7) ms	IT	²⁰³Pb	29/2−
^203m3Pb		2970(50)# keV			122(4) ns	IT	²⁰³Pb	25/2−#
²⁰⁴Pb^{[n 10]}		82	122	203.9730435(12)	Observationally stable^{[n 11]}			0+	0.014(6)	0.0000–0.0158^[10]
^204m1Pb		1274.13(5) keV			265(6) ns	IT	²⁰⁴Pb	4+
^204m2Pb		2185.88(8) keV			66.93(10) min	IT	²⁰⁴Pb	9−
^204m3Pb		2264.42(6) keV			490(70) ns	IT	²⁰⁴Pb	7−
²⁰⁵Pb		82	123	204.9744817(12)	17.0(9)×10⁷ y	EC	²⁰⁵Tl	5/2−
^205m1Pb		2.329(7) keV			24.2(4) μs	IT	²⁰⁵Pb	1/2−
^205m2Pb		1013.85(3) keV			5.55(2) ms	IT	²⁰⁵Pb	13/2+
^205m3Pb		3195.8(6) keV			217(5) ns	IT	²⁰⁵Pb	25/2−
²⁰⁶Pb^{[n 10]}^{[n 12]}	Radium G^[11]	82	124	205.9744652(12)	Observationally stable^{[n 13]}			0+	0.241(30)	0.0190–0.8673^[10]
^206m1Pb		2200.16(4) keV			125(2) μs	IT	²⁰⁶Pb	7−
^206m2Pb		4027.3(7) keV			202(3) ns	IT	²⁰⁶Pb	12+
²⁰⁷Pb^{[n 10]}^{[n 14]}	Actinium D	82	125	206.9758968(12)	Observationally stable^{[n 15]}			1/2−	0.221(50)	0.0035–0.2351^[10]
^207mPb		1633.356(4) keV			806(5) ms	IT	²⁰⁷Pb	13/2+
²⁰⁸Pb^{[n 16]}	Thorium D	82	126	207.9766520(12)	Observationally stable^{[n 17]}			0+	0.524(70)	0.0338–0.9775^[10]
^208mPb		4895.23(5) keV			535(35) ns	IT	²⁰⁸Pb	10+
²⁰⁹Pb		82	127	208.9810900(19)	3.235(5) h	β⁻	²⁰⁹Bi	9/2+	Trace^{[n 18]}
²¹⁰Pb	Radium D Radiolead Radio-lead	82	128	209.9841884(16)	22.20(22) y	β⁻ (100%)	²¹⁰Bi	0+	Trace^{[n 19]}
²¹⁰Pb	Radium D Radiolead Radio-lead	82	128	209.9841884(16)	22.20(22) y	α (1.9×10⁻⁶%)	²⁰⁶Hg	0+	Trace^{[n 19]}
^210m1Pb		1194.61(18) keV			92(10) ns	IT	²¹⁰Pb	6+
^210m2Pb		1274.8(3) keV			201(17) ns	IT	²¹⁰Pb	8+
²¹¹Pb	Actinium B	82	129	210.9887353(24)	36.1628(25) min	β⁻	²¹¹Bi	9/2+	Trace^{[n 20]}
^211mPb		1719(23) keV			159(28) ns	IT	²¹¹Pb	(27/2+)
²¹²Pb	Thorium B	82	130	211.9918959(20)	10.627(6) h	β⁻	²¹²Bi	0+	Trace^{[n 21]}
^212mPb		1335(2) keV			6.0(8) μs	IT	²¹²Pb	8+#
²¹³Pb		82	131	212.9965608(75)	10.2(3) min	β⁻	²¹³Bi	(9/2+)	Trace^{[n 18]}
^213mPb		1331.0(17) keV			260(20) ns	IT	²¹³Pb	(21/2+)
²¹⁴Pb	Radium B	82	132	213.9998035(21)	27.06(7) min	β⁻	²¹⁴Bi	0+	Trace^{[n 19]}
^214mPb		1420(20) keV			6.2(3) μs	IT	²¹⁴Pb	8+#
²¹⁵Pb		82	133	215.004662(57)	142(11) s	β⁻	²¹⁵Bi	9/2+#
²¹⁶Pb		82	134	216.00806(22)#	1.66(20) min	β⁻	²¹⁶Bi	0+
^216mPb		1514(20) keV			400(40) ns	IT	²¹⁶Pb	8+#
²¹⁷Pb		82	135	217.01316(32)#	19.9(53) s	β⁻	²¹⁷Bi	9/2+#
²¹⁸Pb		82	136	218.01678(32)#	14.8(68) s	β⁻	²¹⁸Bi	0+
²¹⁹Pb		82	137	219.02214(43)#	3# s [>300 ns]	β⁻?	²¹⁹Bi	11/2+#
²²⁰Pb		82	138	220.02591(43)#	1# s [>300 ns]	β⁻?	²²⁰Bi	0+
This table header & footer: view

Close

[n 1]
^mPb – Excited nuclear isomer.
[n 2]
( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
[n 3]
# – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
[n 4]
Modes of decay:

EC: Electron capture

IT: Isomeric transition
[n 5]
Bold italics symbol as daughter – Daughter product is nearly stable.
[n 6]
Bold symbol as daughter – Daughter product is stable.
[n 7]
( ) spin value – Indicates spin with weak assignment arguments.
[n 8]
# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
[n 9]
Order of ground state and isomer is uncertain.
[N 10]
Used in lead–lead dating
[N 11]
Believed to undergo α decay to ²⁰⁰Hg with a half-life over 1.4×10²⁰ years; the theoretical lifetime is around ~10^35–37 years.^[9]
[N 12]
Final decay product of 4n+2 decay chain (the Radium or Uranium series)
[N 13]
Believed to undergo α decay to ²⁰²Hg with a half-life over 2.5×10²¹ years; the theoretical lifetime is ~10^65–68 years.^[9]
[N 14]
Final decay product of 4n+3 decay chain (the Actinium series)
[N 15]
Believed to undergo α decay to ²⁰³Hg with a half-life over 1.9×10²¹ years; the theoretical lifetime is ~10^152–189 years.^[9]
[N 16]
Heaviest observationally stable nuclide; final decay product of 4n decay chain (the Thorium series)
[N 17]
Believed to undergo α decay to ²⁰⁴Hg with a half-life over 2.6×10²¹ years; the theoretical lifetime is ~10^124–132 years.^[9]
[N 18]
Intermediate decay product of ²³⁷Np
[N 19]
Intermediate decay product of ²³⁸U
[N 20]
Intermediate decay product of ²³⁵U
[N 21]
Intermediate decay product of ²³²Th

Remove ads

²⁰⁶Pb is the final step in the decay chain of ²³⁸U, the "radium series" or "uranium series". In a closed system, over time, a given mass of ²³⁸U will decay in a sequence of steps culminating in ²⁰⁶Pb. The production of intermediate products eventually reaches an equilibrium (though this takes a long time, as the half-life of ²³⁴U is 245,500 years). Once this stabilized system is reached, the ratio of ²³⁸U to ²⁰⁶Pb will steadily decrease, while the ratios of the other intermediate products to each other remain constant.

Like most radioisotopes found in the radium series, ²⁰⁶Pb was initially named as a variation of radium, specifically radium G. It is the decay product of both ²¹⁰Po (historically called radium F) by alpha decay, and the much rarer ²⁰⁶Tl (radium E^II) by beta decay.

Lead-206 has been proposed for use in fast breeder nuclear fission reactor coolant over the use of natural lead mixture (which also includes other stable lead isotopes) as a mechanism to improve neutron economy and greatly suppress unwanted production of highly radioactive byproducts.^[12]

Remove ads

²⁰⁴Pb is entirely primordial, and is thus useful for estimating the fraction of the other lead isotopes in a given sample that are also primordial, since the relative fractions of the various primordial lead isotopes is constant everywhere.^[13] Any excess lead-206, -207, and -208 is thus assumed to be radiogenic in origin,^[13] allowing various uranium and thorium dating schemes to be used to estimate the age of rocks (time since their formation) based on the relative abundance of lead-204 to other isotopes. ²⁰⁷Pb is the end of the actinium series from ²³⁵U.

²⁰⁸Pb is the end of the thorium series from ²³²Th. While it only makes up approximately half of the composition of lead in most places on Earth, it can be found naturally enriched up to around 90% in thorium ores.^[14] ²⁰⁸Pb is the heaviest known stable nuclide and also the heaviest known doubly magic nucleus, as Z = 82 and N = 126 correspond to closed nuclear shells.^[15] As a consequence of this particularly stable configuration, its neutron capture cross section is very low (even lower than that of deuterium in the thermal spectrum), making it of interest for lead-cooled fast reactors.

Remove ads

²¹²Pb-containing radiopharmaceuticals have been trialed as therapeutic agents for the experimental cancer treatment targeted alpha-particle therapy.^[16]

[1]
Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
[2]
Meija et al. 2016.
[3]
"Standard Atomic Weights: Lead". CIAAW. 2020.
[4]
Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
[5]
Jeter, Hewitt W. (March 2000). "Determining the Ages of Recent Sediments Using Measurements of Trace Radioactivity" (PDF). Terra et Aqua (78): 21–28. Archived from the original (PDF) on March 4, 2016. Retrieved October 23, 2019.
[6]
Blank, B.; Regan, P.H. (2000). "Magic and doubly-magic nuclei". Nuclear Physics News. 10 (4): 20–27. doi:10.1080/10506890109411553. S2CID 121966707.
[7]
Takahashi, K; Boyd, R. N.; Mathews, G. J.; Yokoi, K. (October 1987). "Bound-state beta decay of highly ionized atoms". Physical Review C. 36 (4): 1522–1528. Bibcode:1987PhRvC..36.1522T. doi:10.1103/PhysRevC.36.1522. ISSN 0556-2813. OCLC 1639677. PMID 9954244. Retrieved 2016-11-20. As can be seen in Table I (¹⁸⁷Re, ²¹⁰Pb, ²²⁷Ac, and ²⁴¹Pu), some continuum-state decays are energetically forbidden when the atom is fully ionized. This is because the atomic binding energies liberated by ionization, i.e., the total electron binding in the neutral atom, $B n$ , increases with $Z$ . If [the decay energy] $Q n < B n (Z +1)- B n (Z)$ , the continuum-state $β$ decay is energetically forbidden.
[8]
Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf.
[9]
Beeman, J.W.; et al. (2013). "New experimental limits on the alpha decays of lead isotopes". European Physical Journal A. 49 (4): 50. arXiv:1212.2422. Bibcode:2013EPJA...49...50B. doi:10.1140/epja/i2013-13050-7. S2CID 254111888.
[10]
"Standard Atomic Weights: Lead". CIAAW. 2020.
[11]
Kuhn, W. (1929). "LXVIII. Scattering of thorium C" γ-radiation by radium G and ordinary lead". The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science. 8 (52): 628. doi:10.1080/14786441108564923.
[12]
Khorasanov, G. L.; Ivanov, A. P.; Blokhin, A. I. (2002). Polonium Issue in Fast Reactor Lead Coolants and One of the Ways of Its Solution. 10th International Conference on Nuclear Engineering. pp. 711–717. doi:10.1115/ICONE10-22330.
[13]
Woods, G.D. (November 2014). Lead isotope analysis: Removal of 204Hg isobaric interference from 204Pb using ICP-QQQ in MS/MS mode (PDF) (Report). Stockport, UK: Agilent Technologies.
[14]
A. Yu. Smirnov; V. D. Borisevich; A. Sulaberidze (July 2012). "Evaluation of specific cost of obtainment of lead-208 isotope by gas centrifuges using various raw materials". Theoretical Foundations of Chemical Engineering. 46 (4): 373–378. doi:10.1134/S0040579512040161. S2CID 98821122.
[15]
Blank, B.; Regan, P.H. (2000). "Magic and doubly-magic nuclei". Nuclear Physics News. 10 (4): 20–27. doi:10.1080/10506890109411553. S2CID 121966707.
[16]
Kokov, K.V.; Egorova, B.V.; German, M.N.; Klabukov, I.D.; Krasheninnikov, M.E.; Larkin-Kondrov, A.A.; Makoveeva, K.A.; Ovchinnikov, M.V.; Sidorova, M.V.; Chuvilin, D.Y. (2022). "212Pb: Production Approaches and Targeted Therapy Applications". Pharmaceutics. 14 (1): 189. doi:10.3390/pharmaceutics14010189. ISSN 1999-4923. PMC 8777968. PMID 35057083.

Remove ads

Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–291. doi:10.1515/pac-2015-0305.

Isotope masses from:

Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001

Half-life, spin, and isomer data selected from the following sources.

Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
National Nuclear Data Center. "NuDat 2.x database". Brookhaven National Laboratory.
Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.

Remove ads

[8] [n 1]
^mPb – Excited nuclear isomer.

[10] [n 2]
( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.

[TMS-11] [n 3]
# – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).

[12] [n 4]
Modes of decay:

EC: Electron capture

IT: Isomeric transition

[13] [n 5]
Bold italics symbol as daughter – Daughter product is nearly stable.

[14] [n 6]
Bold symbol as daughter – Daughter product is stable.

[15] [n 7]
( ) spin value – Indicates spin with weak assignment arguments.

[TNN-16] [n 8]
# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).

[order-17] [n 9]
Order of ground state and isomer is uncertain.

[rd-18] [N 10]
Used in lead–lead dating

[20] [N 11]
Believed to undergo α decay to ²⁰⁰Hg with a half-life over 1.4×10²⁰ years; the theoretical lifetime is around ~10^35–37 years.^[9]

[22] [N 12]
Final decay product of 4n+2 decay chain (the Radium or Uranium series)

[24] [N 13]
Believed to undergo α decay to ²⁰²Hg with a half-life over 2.5×10²¹ years; the theoretical lifetime is ~10^65–68 years.^[9]

[25] [N 14]
Final decay product of 4n+3 decay chain (the Actinium series)

[26] [N 15]
Believed to undergo α decay to ²⁰³Hg with a half-life over 1.9×10²¹ years; the theoretical lifetime is ~10^152–189 years.^[9]

[27] [N 16]
Heaviest observationally stable nuclide; final decay product of 4n decay chain (the Thorium series)

[28] [N 17]
Believed to undergo α decay to ²⁰⁴Hg with a half-life over 2.6×10²¹ years; the theoretical lifetime is ~10^124–132 years.^[9]

[ns-29] [N 18]
Intermediate decay product of ²³⁷Np

[RS-30] [N 19]
Intermediate decay product of ²³⁸U

[31] [N 20]
Intermediate decay product of ²³⁵U

[32] [N 21]
Intermediate decay product of ²³²Th

[NUBASE2020-1] [1]
Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.

[FOOTNOTEMeijaCoplenBerglundBrand2016-2] [2]
Meija et al. 2016.

[3] [3]
"Standard Atomic Weights: Lead". CIAAW. 2020.

[CIAAW2021-4] [4]
Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.

[5] [5]
Jeter, Hewitt W. (March 2000). "Determining the Ages of Recent Sediments Using Measurements of Trace Radioactivity" (PDF). Terra et Aqua (78): 21–28. Archived from the original (PDF) on March 4, 2016. Retrieved October 23, 2019.

[magic-6] [6]
Blank, B.; Regan, P.H. (2000). "Magic and doubly-magic nuclei". Nuclear Physics News. 10 (4): 20–27. doi:10.1080/10506890109411553. S2CID 121966707.

[Takahashi_et_al-7] [7]
Takahashi, K; Boyd, R. N.; Mathews, G. J.; Yokoi, K. (October 1987). "Bound-state beta decay of highly ionized atoms". Physical Review C. 36 (4): 1522–1528. Bibcode:1987PhRvC..36.1522T. doi:10.1103/PhysRevC.36.1522. ISSN 0556-2813. OCLC 1639677. PMID 9954244. Retrieved 2016-11-20. As can be seen in Table I (¹⁸⁷Re, ²¹⁰Pb, ²²⁷Ac, and ²⁴¹Pu), some continuum-state decays are energetically forbidden when the atom is fully ionized. This is because the atomic binding energies liberated by ionization, i.e., the total electron binding in the neutral atom, $B n$ , increases with $Z$ . If [the decay energy] $Q n < B n (Z +1)- B n (Z)$ , the continuum-state $β$ decay is energetically forbidden.

[AME2020_II-9] [8]
Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf.

[Bellini-19] [9]
Beeman, J.W.; et al. (2013). "New experimental limits on the alpha decays of lead isotopes". European Physical Journal A. 49 (4): 50. arXiv:1212.2422. Bibcode:2013EPJA...49...50B. doi:10.1140/epja/i2013-13050-7. S2CID 254111888.

[CIAAW-21] [10]
"Standard Atomic Weights: Lead". CIAAW. 2020.

[Kuhn1929-23] [11]
Kuhn, W. (1929). "LXVIII. Scattering of thorium C" γ-radiation by radium G and ordinary lead". The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science. 8 (52): 628. doi:10.1080/14786441108564923.

[33] [12]
Khorasanov, G. L.; Ivanov, A. P.; Blokhin, A. I. (2002). Polonium Issue in Fast Reactor Lead Coolants and One of the Ways of Its Solution. 10th International Conference on Nuclear Engineering. pp. 711–717. doi:10.1115/ICONE10-22330.

[pb204-34] [13]
Woods, G.D. (November 2014). Lead isotope analysis: Removal of 204Hg isobaric interference from 204Pb using ICP-QQQ in MS/MS mode (PDF) (Report). Stockport, UK: Agilent Technologies.

[35] [14]
A. Yu. Smirnov; V. D. Borisevich; A. Sulaberidze (July 2012). "Evaluation of specific cost of obtainment of lead-208 isotope by gas centrifuges using various raw materials". Theoretical Foundations of Chemical Engineering. 46 (4): 373–378. doi:10.1134/S0040579512040161. S2CID 98821122.

[dmagic-36] [15]
Blank, B.; Regan, P.H. (2000). "Magic and doubly-magic nuclei". Nuclear Physics News. 10 (4): 20–27. doi:10.1080/10506890109411553. S2CID 121966707.

[37] [16]
Kokov, K.V.; Egorova, B.V.; German, M.N.; Klabukov, I.D.; Krasheninnikov, M.E.; Larkin-Kondrov, A.A.; Makoveeva, K.A.; Ovchinnikov, M.V.; Sidorova, M.V.; Chuvilin, D.Y. (2022). "212Pb: Production Approaches and Targeted Therapy Applications". Pharmaceutics. 14 (1): 189. doi:10.3390/pharmaceutics14010189. ISSN 1999-4923. PMC 8777968. PMID 35057083.

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[n 1]

[8]

[n 2]

[n 3]

[n 4]

[n 5]

[n 6]

[n 7]

[n 8]

[n 9]

[n 10]

[n 11]

[10]

[n 12]

[11]

[n 13]

[n 14]

[n 15]

[n 16]

[n 17]

[n 18]

[n 19]

[n 20]

[n 21]

[9]

[12]

[13]

[14]

[15]

[16]

Isotopes of lead

Wikiwand in your browser!

List of isotopes

Lead-206

Lead-204, -207, and -208

Lead-212

References

Sources