Isotopes of iodine
List of isotopes
Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe) Has medical uses Fission product Theoretically capable of spontaneous fission Can be used to date certain early events in Solar System history and some use for dating groundwater Cosmogenic nuclide, also found as nuclear contamination Produced as a decay product of ¹³⁵Te in nuclear reactors, in turn decays to ¹³⁵Xe, which, if allowed to build up, can shut down reactors due to the iodine pit phenomenon

Isotopes of iodine

Section Title: List of isotopes
Table Section Text: Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe) Has medical uses Fission product Theoretically capable of spontaneous fission Can be used to date certain early events in Solar System history and some use for dating groundwater Cosmogenic nuclide, also found as nuclear contamination Produced as a decay product of ¹³⁵Te in nuclear reactors, in turn decays to ¹³⁵Xe, which, if allowed to build up, can shut down reactors due to the iodine pit phenomenon

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

excitation energy

108I	53	55	107.94348(39)#	36(6) ms	α (90%)	104Sb	(1)#

β+ (9%)	108Te

p (1%)	107Te

109I	53	56	108.93815(11)	103(5) µs	p (99.5%)	108Te	(5/2+)

α (.5%)	105Sb

110I	53	57	109.93524(33)#	650(20) ms	β+ (70.9%)	110Te	1+#

α (17%)	106Sb

β+, p (11%)	109Sb

β+, α (1.09%)	106Sn

111I	53	58	110.93028(32)#	2.5(2) s	β+ (99.92%)	111Te	(5/2+)#

α (.088%)	107Sb

112I	53	59	111.92797(23)#	3.42(11) s	β+ (99.01%)	112Te

β+, p (.88%)	111Sb

β+, α (.104%)	108Sn

α (.0012%)	108Sb

113I	53	60	112.92364(6)	6.6(2) s	β+ (100%)	113Te	5/2+#

α (3.3×10−7%)	109Sb

β+, α	109Sn

114I	53	61	113.92185(32)#	2.1(2) s	β+	114Te	1+

β+, p (rare)	113Sb

114mI	265.9(5) keV	6.2(5) s	β+ (91%)	114Te	(7)

IT (9%)	114I

115I	53	62	114.91805(3)	1.3(2) min	β+	115Te	(5/2+)#

116I	53	63	115.91681(10)	2.91(15) s	β+	116Te	1+

116mI	400(50)# keV	3.27(16) µs	(7−)

117I	53	64	116.91365(3)	2.22(4) min	β+	117Te	(5/2)+

118I	53	65	117.913074(21)	13.7(5) min	β+	118Te	2−

118mI	190.1(10) keV	8.5(5) min	β+	118Te	(7−)

IT (rare)	118I

119I	53	66	118.91007(3)	19.1(4) min	β+	119Te	5/2+

120I	53	67	119.910048(19)	81.6(2) min	β+	120Te	2−

120m1I	72.61(9) keV	228(15) ns	(1+,2+,3+)

120m2I	320(15) keV	53(4) min	β+	120Te	(7−)

121I	53	68	120.907367(11)	2.12(1) h	β+	121Te	5/2+

121mI	2376.9(4) keV	9.0(15) µs

122I	53	69	121.907589(6)	3.63(6) min	β+	122Te	1+

123I	53	70	122.905589(4)	13.2235(19) h	EC	123Te	5/2+

124I	53	71	123.9062099(25)	4.1760(3) d	β+	124Te	2−

125I	53	72	124.9046302(16)	59.400(10) d	EC	125Te	5/2+

126I	53	73	125.905624(4)	12.93(5) d	β+ (56.3%)	126Te	2−

β− (43.7%)	126Xe

127I	53	74	126.904473(4)	Stable	5/2+	1.0000

128I	53	75	127.905809(4)	24.99(2) min	β− (93.1%)	128Xe	1+

β+ (6.9%)	128Te

128m1I	137.850(4) keV	845(20) ns	4−

128m2I	167.367(5) keV	175(15) ns	(6)−

129I	53	76	128.904988(3)	1.57(4)×107 y	β−	129Xe	7/2+	Trace

130I	53	77	129.906674(3)	12.36(1) h	β−	130Xe	5+

130m1I	39.9525(13) keV	8.84(6) min	IT (84%)	130I	2+

β− (16%)	130Xe

130m2I	69.5865(7) keV	133(7) ns	(6)−

130m3I	82.3960(19) keV	315(15) ns

130m4I	85.1099(10) keV	254(4) ns	(6)−

131I	53	78	130.9061246(12)	8.02070(11) d	β−	131Xe	7/2+

132I	53	79	131.907997(6)	2.295(13) h	β−	132Xe	4+

132mI	104(12) keV	1.387(15) h	IT (86%)	132I	(8−)

β− (14%)	132Xe

133I	53	80	132.907797(5)	20.8(1) h	β−	133Xe	7/2+

133m1I	1634.174(17) keV	9(2) s	IT	133I	(19/2−)

133m2I	1729.160(17) keV	~170 ns	(15/2−)

134I	53	81	133.909744(9)	52.5(2) min	β−	134Xe	(4)+

134mI	316.49(22) keV	3.52(4) min	IT (97.7%)	134I	(8)−

β− (2.3%)	134Xe

135I	53	82	134.910048(8)	6.57(2) h	β−	135Xe	7/2+

136I	53	83	135.91465(5)	83.4(10) s	β−	136Xe	(1−)

136mI	650(120) keV	46.9(10) s	β−	136Xe	(6−)

137I	53	84	136.917871(30)	24.13(12) s	β− (92.86%)	137Xe	(7/2+)

β−, n (7.14%)	136Xe

138I	53	85	137.92235(9)	6.23(3) s	β− (94.54%)	138Xe	(2−)

β−, n (5.46%)	137Xe

139I	53	86	138.92610(3)	2.282(10) s	β− (90%)	139Xe	7/2+#

β−, n (10%)	138Xe

140I	53	87	139.93100(21)#	860(40) ms	β− (90.7%)	140Xe	(3)(−#)

β−, n (9.3%)	139Xe

141I	53	88	140.93503(21)#	430(20) ms	β− (78%)	141Xe	7/2+#

β−, n (22%)	140Xe

142I	53	89	141.94018(43)#	~200 ms	β− (75%)	142Xe	2−#

β−, n (25%)	141Xe

143I	53	90	142.94456(43)#	100# ms [> 300 ns]	β−	143Xe	7/2+#

144I	53	91	143.94999(54)#	50# ms [> 300 ns]	β−	144Xe	1−#

Sentence(s)

¹²³I, ¹²⁴I, ¹²⁵I, and ¹³¹I are the isotopes of iodine.

final_sentence: ¹²³I, ¹²⁴I, ¹²⁵I, and ¹³¹I are the isotopes of iodine.