Isotopes of bismuth
List of isotopes
Bold for isotopes with half-lives longer than the age of the universe (nearly stable) Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes Formerly believed to be final decay product of 4n+1 decay chain Primordial radioisotope, also some is radiogenic from the extinct nuclide ²³⁷Np Formerly believed to be the heaviest stable nuclide Intermediate decay product of ²³⁸U Intermediate decay product of ²³⁵U Intermediate decay product of ²³²Th Used in medicine such as for cancer treatment.

Isotopes of bismuth

Section Title: List of isotopes
Table Section Text: Bold for isotopes with half-lives longer than the age of the universe (nearly stable) Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes Formerly believed to be final decay product of 4n+1 decay chain Primordial radioisotope, also some is radiogenic from the extinct nuclide ²³⁷Np Formerly believed to be the heaviest stable nuclide Intermediate decay product of ²³⁸U Intermediate decay product of ²³⁵U Intermediate decay product of ²³²Th Used in medicine such as for cancer treatment.

nuclide symbol	historic name	Z(p)	N(n)	isotopic mass (u)	half-life	decay mode	daughter isotope	nuclear spin and parity	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)

excitation energy

184Bi	83	101	184.00112(14)#	6.6(15) ms	3+#

184mBi	150(100)# keV	13(2) ms	10−#

185Bi	83	102	184.99763(6)#	2# ms	p	184Pb	9/2−#

α (rare)	181Tl

185mBi	70(50)# keV	49(7) µs	α	181Tl	1/2+

p	184Pb

186Bi	83	103	185.99660(8)	14.8(7) ms	α	182Tl	(3+)

β+ (rare)	186Pb

186mBi	270(140)# keV	9.8(4) ms	α	182Tl	(10−)

β+	186Pb

187Bi	83	104	186.993158(16)	32(3) ms	α (50%)	183Tl	9/2−#

β+ (50%)	187Pb

187m1Bi	101(20) keV	320(70) µs	1/2+#

187m2Bi	252(1) keV	7(5) µs	(13/2+)

188Bi	83	105	187.99227(5)	44(3) ms	α	184Tl	3+#

β+ (rare)	188Pb

188mBi	210(140)# keV	220(40) ms	α	184Tl	(10−)

β+ (rare)	188Pb

189Bi	83	106	188.98920(6)	674(11) ms	α (51%)	185Tl	(9/2−)

β+ (49%)	189Pb

189m1Bi	181(6) keV	5.0(1) ms	(1/2+)

189m2Bi	357(1) keV	880(50) ns	(13/2+)

190Bi	83	107	189.9883(2)	6.3(1) s	α (77%)	186Tl	(3+)

β+ (30%)	190Pb

190m1Bi	420(180) keV	6.2(1) s	α (70%)	186Tl	(10−)

β+ (23%)	190Pb

190m2Bi	690(180) keV	>500(100) ns	7+#

191Bi	83	108	190.985786(8)	12.3(3) s	α (60%)	187Tl	(9/2−)

β+ (40%)	191Pb

191mBi	240(4) keV	124(5) ms	α (75%)	187Tl	(1/2+)

β+ (25%)	191Pb

192Bi	83	109	191.98546(4)	34.6(9) s	β+ (82%)	192Pb	(3+)

α (18%)	188Tl

192mBi	150(30) keV	39.6(4) s	β+ (90.8%)	192Pb	(10−)

α (9.2%)	188Tl

193Bi	83	110	192.98296(1)	67(3) s	β+ (95%)	193Pb	(9/2−)

α (5%)	189Tl

193mBi	308(7) keV	3.2(6) s	α (90%)	189Tl	(1/2+)

β+ (10%)	193Pb

194Bi	83	111	193.98283(5)	95(3) s	β+ (99.54%)	194Pb	(3+)

α (.46%)	190Tl

194m1Bi	110(70) keV	125(2) s	β+	194Pb	(6+,7+)

α (rare)	190Tl

194m2Bi	230(90)# keV	115(4) s	(10−)

195Bi	83	112	194.980651(6)	183(4) s	β+ (99.97%)	195Pb	(9/2−)

α (.03%)	191Tl

195m1Bi	399(6) keV	87(1) s	β+ (67%)	195Pb	(1/2+)

α (33%)	191Tl

195m2Bi	2311.4+X keV	750(50) ns	(29/2−)

196Bi	83	113	195.980667(26)	5.1(2) min	β+ (99.99%)	196Pb	(3+)

α (.00115%)	192Tl

196m1Bi	166.6(30) keV	0.6(5) s	IT	196Bi	(7+)

β+	196Pb

196m2Bi	270(3) keV	4.00(5) min	(10−)

197Bi	83	114	196.978864(9)	9.33(50) min	β+ (99.99%)	197Pb	(9/2−)

α (10−4%)	193Tl

197m1Bi	690(110) keV	5.04(16) min	α (55%)	193Tl	(1/2+)

β+ (45%)	197Pb

IT (.3%)	197Bi

197m2Bi	2129.3(4) keV	204(18) ns	(23/2−)

197m3Bi	2360.4(5)+X keV	263(13) ns	(29/2−)

197m4Bi	2383.1(7)+X keV	253(39) ns	(29/2−)

197m5Bi	2929.5(5) keV	209(30) ns	(31/2−)

198Bi	83	115	197.97921(3)	10.3(3) min	β+	198Pb	(2+,3+)

198m1Bi	280(40) keV	11.6(3) min	β+	198Pb	(7+)

198m2Bi	530(40) keV	7.7(5) s	10−

199Bi	83	116	198.977672(13)	27(1) min	β+	199Pb	9/2−

199m1Bi	667(4) keV	24.70(15) min	β+ (98%)	199Pb	(1/2+)

IT (2%)	199Bi

α (.01%)	195Tl

199m2Bi	1947(25) keV	0.10(3) µs	(25/2+)

199m3Bi	~2547.0 keV	168(13) ns	29/2−

200Bi	83	117	199.978132(26)	36.4(5) min	β+	200Pb	7+

200m1Bi	100(70)# keV	31(2) min	EC (90%)	200Pb	(2+)

IT (10%)	200Bi

200m2Bi	428.20(10) keV	400(50) ms	(10−)

201Bi	83	118	200.977009(16)	108(3) min	β+ (99.99%)	201Pb	9/2−

α (10−4%)	197Tl

201m1Bi	846.34(21) keV	59.1(6) min	EC (92.9%)	201Pb	1/2+

IT (6.8%)	201Bi

α (.3%)	197Tl

201m2Bi	1932.2+X keV	118(28) ns	(25/2+)

201m3Bi	1971.2+X keV	105(75) ns	(27/2+)

201m4Bi	2739.90(20)+X keV	124(4) ns	(29/2−)

202Bi	83	119	201.977742(22)	1.72(5) h	β+	202Pb	5(+#)

α (10−5%)	198Tl

202m1Bi	615(7) keV	3.04(6) µs	(10#)−

202m2Bi	2607.1(5) keV	310(50) ns	(17+)

203Bi	83	120	202.976876(23)	11.76(5) h	β+	203Pb	9/2−

α (10−5%)	199Tl

203m1Bi	1098.14(7) keV	303(5) ms	IT	203Bi	1/2+

203m2Bi	2041.5(6) keV	194(30) ns	25/2+

204Bi	83	121	203.977813(28)	11.22(10) h	β+	204Pb	6+

204m1Bi	805.5(3) keV	13.0(1) ms	IT	204Bi	10−

204m2Bi	2833.4(11) keV	1.07(3) ms	(17+)

205Bi	83	122	204.977389(8)	15.31(4) d	β+	205Pb	9/2−

206Bi	83	123	205.978499(8)	6.243(3) d	β+	206Pb	6(+)

206m1Bi	59.897(17) keV	7.7(2) µs	(4+)

206m2Bi	1044.8(5) keV	890(10) µs	(10−)

207Bi	83	124	206.9784707(26)	32.9(14) y	β+	207Pb	9/2−

207mBi	2101.49(16) keV	182(6) µs	21/2+

208Bi	83	125	207.9797422(25)	3.68(4)×105 y	β+	208Pb	(5)+

208mBi	1571.1(4) keV	2.58(4) ms	IT	208Bi	(10)−

209Bi	83	126	208.9803987(16)	1.9(2)×1019 y	α	205Tl	9/2−	1.0000

210Bi	Radium E	83	127	209.9841204(16)	5.012(5) d	β−	210Po	1−	Trace

α (1.32×10−4%)	206Tl

210mBi	271.31(11) keV	3.04(6)×106 y	α	206Tl	9−

211Bi	Actinium C	83	128	210.987269(6)	2.14(2) min	α (99.72%)	207Tl	9/2−	Trace

β− (.276%)	211Po

211mBi	1257(10) keV	1.4(3) µs	(25/2−)

212Bi	Thorium C	83	129	211.9912857(21)	60.55(6) min	β− (64.05%)	212Po	1(−)	Trace

α (35.94%)	208Tl

β−, α (.014%)	208Pb

212m1Bi	250(30) keV	25.0(2) min	α (67%)	208Tl	(9−)

β− (33%)	212mPo

β−, α (.3%)	208Pb

212m2Bi	2200(200)# keV	7.0(3) min	>16

213Bi	83	130	212.994385(5)	45.59(6) min	β− (97.91%)	213Po	9/2−

α (2.09%)	209Tl

214Bi	Radium C	83	131	213.998712(12)	19.9(4) min	β− (99.97%)	214Po	1−	Trace

α (.021%)	210Tl

β−, α (.003%)	210Pb

215Bi	83	132	215.001770(16)	7.6(2) min	β−	215Po	(9/2−)	Trace

215mBi	1347.5(25) keV	36.9(0.6) s	IT (76.9%)	215Bi	(25/2−)

β− (23.1%)	215Po

216Bi	83	133	216.006306(12)	2.17(5) min	β−	216Po	(6-, 7-)

216mBi	24(19) keV	6.6(2.1) min	β−	216Po	3-#

217Bi	83	134	217.009372(19)	98.5(8) s	β−	217Po	9/2−#

217mBi	1480(40) keV	2.70(0.06) µs	IT	217Bi	25/2−#

218Bi	83	135	218.014188(29)	33(1) s	β−	218Po	(6-, 7-, 8-)

219Bi	83	136	219.017480(210)#	8.7(2.9) s	β−	219Po	9/2-#

220Bi	83	137	220.022350(320)#	9.5(5.7) s	β−	220Po	1-#

Sentence(s)

Radioisotope ²¹⁰Bi has a half-life of 5.012 days.

final_sentence: Radioisotope ²¹⁰Bi has a half-life of 5.012 days.