Isotopes of antimony explained

Antimony (Sb) occurs in two stable isotopes, Sb and Sb. There are 37 artificial radioactive isotopes, the longest-lived of which are Sb, with a half-life of 2.75856 years; Sb, with half-life 60.2 days; and Sb, with half-life 12.35 days. All other isotopes have half-lives less than 4 days, most less than an hour. There are also many isomers, the longest-lived of which is Sb with half-life 5.76 days.

Except for beryllium, antimony is the lightest element observed to have isotopes capable of alpha decay; Sb is seen to undergo this mode of decay. Some light elements, namely those near Be, have isotopes with delayed alpha emission (following proton or beta emission) as a rare branch.

List of isotopes

|-id=Antimony-104| rowspan=4|¹⁰⁴Sb| rowspan=4 style="text-align:right" | 51| rowspan=4 style="text-align:right" | 53| rowspan=4|103.93634(11)#| rowspan=4|470(130) ms| β⁺?| ¹⁰⁴Sn| rowspan=4|| rowspan=4|| rowspan=4||-| p (<7%)| ¹⁰³Sn|-| β⁺, p (<7%)| ¹⁰³In|-| α?| ¹⁰⁰In|-id=Antimony-105| rowspan=3|¹⁰⁵Sb| rowspan=3 style="text-align:right" | 51| rowspan=3 style="text-align:right" | 54| rowspan=3|104.931277(23)| rowspan=3|1.12(16) s| β⁺ (>99.9%)| ¹⁰⁵Sn| rowspan=3|(5/2+)| rowspan=3|| rowspan=3||-| p (<0.1%)| ¹⁰⁴Sn|-| β⁺, p?| ¹⁰⁴In|-id=Antimony-106| ¹⁰⁶Sb| style="text-align:right" | 51| style="text-align:right" | 55| 105.9286380(80)| 0.6(2) s| β⁺| ¹⁰⁶Sn| (2+)|||-id=Antimony-106m| style="text-indent:1em" | ^106mSb| colspan="3" style="text-indent:2em" | 103.5(3) keV| 226(14) ns| IT| ¹⁰⁶Sb| (4+)|||-id=Antimony-107| ¹⁰⁷Sb| style="text-align:right" | 51| style="text-align:right" | 56| 106.9241506(45)| 4.0(2) s| β⁺| ¹⁰⁷Sn| 5/2+#|||-id=Antimony-108| ¹⁰⁸Sb| style="text-align:right" | 51| style="text-align:right" | 57| 107.9222267(59)| 7.4(3) s| β⁺| ¹⁰⁸Sn| (4+)| | |-id=Antimony-109| ¹⁰⁹Sb| style="text-align:right" | 51| style="text-align:right" | 58| 108.9181412(57)| 17.2(5) s| β⁺| ¹⁰⁹Sn| 5/2+#|||-id=Antimony-110| ¹¹⁰Sb| style="text-align:right" | 51| style="text-align:right" | 59| 109.9168543(64)| 23.6(3) s| β⁺| ¹¹⁰Sn| (3+)|||-id=Antimony-111| ¹¹¹Sb| style="text-align:right" | 51| style="text-align:right" | 60| 110.9132182(95)| 75(1) s| β⁺| ¹¹¹Sn| (5/2+)|||-id=Antimony-112| ¹¹²Sb| style="text-align:right" | 51| style="text-align:right" | 61| 111.912400(19)| 53.5(6) s| β⁺| ¹¹²Sn| (3+)|||-id=Antimony-112m| style="text-indent:1em" | ^112mSb| colspan="3" style="text-indent:2em" | 825.9(4) keV| 536(22) ns| IT| ¹¹²Sb| (8−)|||-id=Antimony-113| ¹¹³Sb| style="text-align:right" | 51| style="text-align:right" | 62| 112.909375(18)| 6.67(7) min| β⁺| ¹¹³Sn| 5/2+|||-id=Antimony-114| ¹¹⁴Sb| style="text-align:right" | 51| style="text-align:right" | 63| 113.909289(21)| 3.49(3) min| β⁺| ¹¹⁴Sn| 3+|||-id=Antimony-114m| style="text-indent:1em" | ^114mSb| colspan="3" style="text-indent:2em" | 495.5(7) keV| 219(12) μs| IT| ¹¹⁴Sb| (8−)|||-id=Antimony-115| ¹¹⁵Sb| style="text-align:right" | 51| style="text-align:right" | 64| 114.906598(17)| 32.1(3) min| β⁺| ¹¹⁵Sn| 5/2+|||-id=Antimony-115m| style="text-indent:1em" | ^115mSb| colspan="3" style="text-indent:2em" | 2796.26(9) keV| 159(3) ns| IT| ¹¹⁵Sb| (19/2)−|||-id=Antimony-116| ¹¹⁶Sb| style="text-align:right" | 51| style="text-align:right" | 65| 115.9067927(55)| 15.8(8) min| β⁺| ¹¹⁶Sn| 3+|||-id=Antimony-116m1| style="text-indent:1em" | ^116m1Sb| colspan="3" style="text-indent:2em" | 93.99(5) keV| 194(4) ns| IT| ¹¹⁶Sb| 1+|||-id=Antimony-116m2| style="text-indent:1em" | ^116m2Sb| colspan="3" style="text-indent:2em" | 390(40) keV| 60.3(6) min| β⁺| ¹¹⁶Sn| 8−|||-id=Antimony-117| ¹¹⁷Sb| style="text-align:right" | 51| style="text-align:right" | 66| 116.9048415(91)| 2.97(2) h| β⁺| ¹¹⁷Sn| 5/2+|||-id=Antimony-117m1| style="text-indent:1em" | ^117m1Sb| colspan="3" style="text-indent:2em" | 3130.76(19) keV| 355(17) μs| IT| ¹¹⁷Sb| (25/2)+|||-id=Antimony-117m2| style="text-indent:1em" | ^117m2Sb| colspan="3" style="text-indent:2em" | 3230.7(2) keV| 290(5) ns| IT| ¹¹⁷Sb| (23/2−)|||-id=Antimony-118| ¹¹⁸Sb| style="text-align:right" | 51| style="text-align:right" | 67| 117.9055322(32)| 3.6(1) min| β⁺| ¹¹⁸Sn| 1+|||-id=Antimony-118m1| style="text-indent:1em" | ^118m1Sb| colspan="3" style="text-indent:2em" | 50.814(21) keV| 20.6(6) μs| IT| ¹¹⁸Sb| 3+|||-id=Antimony-118m2| style="text-indent:1em" | ^118m2Sb| colspan="3" style="text-indent:2em" | 250(6) keV| 5.01(3) h| β⁺| ¹¹⁸Sn| 8−|||-id=Antimony-119| ¹¹⁹Sb| style="text-align:right" | 51| style="text-align:right" | 68| 118.9039441(75)| 38.19(22) h| EC| ¹¹⁹Sn| 5/2+|||-id=Antimony-119m1| style="text-indent:1em" | ^119m1Sb| colspan="3" style="text-indent:2em" | 2553.6(3) keV| 130(3) ns| IT| ¹¹⁹Sb| 19/2−|||-id=Antimony-119m2| style="text-indent:1em" | ^119m2Sb| colspan="3" style="text-indent:2em" | 2841.7(4) keV| 835(81) ms| IT| ¹¹⁹Sb| 25/2+|||-id=Antimony-120| ¹²⁰Sb| style="text-align:right" | 51| style="text-align:right" | 69| 119.9050803(77)| 15.89(4) min| β⁺| ¹²⁰Sn| 1+|||-id=Antimony-120m1| style="text-indent:1em" | ^120m1Sb^[1] | colspan="3" style="text-indent:2em" | 0(100)# keV| 5.76(2) d| β⁺| ¹²⁰Sn| 8−|||-id=Antimony-120m2| style="text-indent:1em" | ^120m2Sb| colspan="3" style="text-indent:2em" | 78.16(5) keV| 246(2) ns| IT| ¹²⁰Sb| (3+)|||-id=Antimony-120m3| style="text-indent:1em" | ^120m3Sb| colspan="3" style="text-indent:2em" | 2328(100)# keV| 400(8) ns| IT| ¹²⁰Sb| 13+|||-id=Antimony-121| ¹²¹Sb^[2] | style="text-align:right" | 51| style="text-align:right" | 70| 120.9038114(27)| colspan=3 align=center|Stable| 5/2+| 0.5721(5)||-id=Antimony-121m| style="text-indent:1em" | ^121mSb| colspan="3" style="text-indent:2em" | 2751(17) keV| 179(6) μs| IT| ¹²¹Sb| (25/2+)|||-id=Antimony-122| rowspan=2|¹²²Sb| rowspan=2 style="text-align:right" | 51| rowspan=2 style="text-align:right" | 71| rowspan=2|121.9051693(27)| rowspan=2|2.7238(2) d| β⁻ (97.59%)| ¹²²Te| rowspan=2|2−| rowspan=2|| rowspan=2||-| β⁺ (2.41%)| ¹²²Sn|-id=Antimony-122m1| style="text-indent:1em" | ^122m1Sb| colspan="3" style="text-indent:2em" | 61.4131(5) keV| 1.86(8) μs| IT| ¹²²Sb| 3+|||-id=Antimony-122m2| style="text-indent:1em" | ^122m2Sb| colspan="3" style="text-indent:2em" | 137.4726(8) keV| 0.53(3) ms| IT| ¹²²Sb| 5+|||-id=Antimony-122m3| style="text-indent:1em" | ^122m3Sb| colspan="3" style="text-indent:2em" | 163.5591(17) keV| 4.191(3) min| IT| ¹²²Sb| 8−|||-id=Antimony-123| ¹²³Sb| style="text-align:right" | 51| style="text-align:right" | 72| 122.9042153(15)| colspan=3 align=center|Stable| 7/2+| 0.4279(5)||-id=Antimony-123m1| style="text-indent:1em" | ^123m1Sb| colspan="3" style="text-indent:2em" | 2237.8(3) keV| 214(3) ns| IT| ¹²³Sb| 19/2−|||-id=Antimony-123m2| style="text-indent:1em" | ^123m2Sb| colspan="3" style="text-indent:2em" | 2613.4(4) keV| 65(1) μs| IT| ¹²³Sb| 23/2+|||-id=Antimony-124| ¹²⁴Sb| style="text-align:right" | 51| style="text-align:right" | 73| 123.9059371(15)| 60.20(3) d| β⁻| ¹²⁴Te| 3−|||-id=Antimony-124m1| rowspan=2 style="text-indent:1em" | ^124m1Sb| rowspan=2 colspan="3" style="text-indent:2em" | 10.8627(8) keV| rowspan=2|93(5) s| IT (75%)| ¹²⁴Sb| rowspan=2|5+| rowspan=2|| rowspan=2||-| β⁻ (25%)| ¹²⁴Te|-id=Antimony-124m2| style="text-indent:1em" | ^124m2Sb| colspan="3" style="text-indent:2em" | 36.8440(14) keV| 20.2(2) min| IT| ^124m1Sb| (8)−|||-id=Antimony-124m3| style="text-indent:1em" | ^124m3Sb| colspan="3" style="text-indent:2em" | 40.8038(7) keV| 3.2(3) μs| IT| ¹²⁴Sb| (3+)|||-id=Antimony-125| ¹²⁵Sb| style="text-align:right" | 51| style="text-align:right" | 74| 124.9052543(27)| 2.7576(11) y| β⁻| ¹²⁵Te| 7/2+|||-id=Antimony-125m1| style="text-indent:1em" | ^125m1Sb| colspan="3" style="text-indent:2em" | 1971.25(20) keV| 4.1(2) μs| IT| ¹²⁵Sb| 15/2−|||-id=Antimony-125m2| style="text-indent:1em" | ^125m2Sb| colspan="3" style="text-indent:2em" | 2112.1(3) keV| 28.5(5) μs| IT| ¹²⁵Sb| 19/2−|||-id=Antimony-125m3| style="text-indent:1em" | ^125m3Sb| colspan="3" style="text-indent:2em" | 2471.0(4) keV| 277.0(64) ns| IT| ¹²⁵Sb| (23/2)+|||-id=Antimony-126| ¹²⁶Sb| style="text-align:right" | 51| style="text-align:right" | 75| 125.907253(34)| 12.35(6) d| β⁻| ¹²⁶Te| 8−|||-id=Antimony-126m1| rowspan=2 style="text-indent:1em" | ^126m1Sb| rowspan=2 colspan="3" style="text-indent:2em" | 17.7(3) keV| rowspan=2|19.15(8) min| β⁻ (86%)| ¹²⁶Te| rowspan=2|5+| rowspan=2|| rowspan=2||-| IT (14%)| ¹²⁶Sb|-id=Antimony-126m2| style="text-indent:1em" | ^126m2Sb| colspan="3" style="text-indent:2em" | 40.4(3) keV| ~11 s| IT| ^126m1Sb| 3−|||-id=Antimony-126m3| style="text-indent:1em" | ^126m3Sb| colspan="3" style="text-indent:2em" | 104.6(3) keV| 553(5) ns| IT| ¹²⁶Sb| 3+|||-id=Antimony-126m4| style="text-indent:1em" | ^126m4Sb| colspan="3" style="text-indent:2em" | 1810.7(17) keV| 90(16) ns| IT| ¹²⁶Sb| (13+)|||-id=Antimony-127| ¹²⁷Sb| style="text-align:right" | 51| style="text-align:right" | 76| 126.9069256(55)| 3.85(5) d| β⁻| ¹²⁷Te| 7/2+|||-id=Antimony-127m1| style="text-indent:1em" | ^127m1Sb| colspan="3" style="text-indent:2em" | 1920.19(21) keV| 11.7(1) μs| IT| ¹²⁷Sb| 15/2−|||-id=Antimony-127m2| style="text-indent:1em" | ^127m2Sb| colspan="3" style="text-indent:2em" | 2324.7(4) keV| 269(5) ns| IT| ¹²⁷Sb| 23/2+|||-id=Antimony-128| ¹²⁸Sb| style="text-align:right" | 51| style="text-align:right" | 77| 127.909146(20)| 9.05(4) h| β⁻| ¹²⁸Te| 8−|||-id=Antimony-128m1| rowspan=2 style="text-indent:1em" | ^128m1Sb^[1] | rowspan=2 colspan="3" style="text-indent:2em" | 10(6) keV| rowspan=2|10.41(18) min| β⁻ (96.4%)| ¹²⁸Te| rowspan=2|5+| rowspan=2|| rowspan=2||-| IT (3.6%)| ¹²⁸Sb|-id=Antimony-128m2| style="text-indent:1em" | ^128m2Sb| colspan="3" style="text-indent:2em" | 1617.3(7) keV| 500(20) ns| IT| ¹²⁸Sb| (11+)|||-id=Antimony-128m3| style="text-indent:1em" | ^128m3Sb| colspan="3" style="text-indent:2em" | 1769.9(12) keV| 217(7) ns| IT| ¹²⁸Sb| (13+)|||-id=Antimony-129| ¹²⁹Sb| style="text-align:right" | 51| style="text-align:right" | 78| 128.909147(23)| 4.366(26) h| β⁻| ¹²⁹Te| 7/2+|||-id=Antimony-129m1| rowspan=2 style="text-indent:1em" | ^129m1Sb| rowspan=2 colspan="3" style="text-indent:2em" | 1851.31(6) keV| rowspan=2|17.7(1) min| β⁻ (85%)| ¹²⁹Te| rowspan=2|19/2−| rowspan=2|| rowspan=2||-| IT (15%)| ¹²⁹Sb|-id=Antimony-129m2| style="text-indent:1em" | ^129m2Sb| colspan="3" style="text-indent:2em" | 1861.06(5) keV| 2.23(17) μs| IT| ¹²⁹Sb| 15/2−|||-id=Antimony-129m3| style="text-indent:1em" | ^129m3Sb| colspan="3" style="text-indent:2em" | 2139.4(3) keV| 0.89(3) μs| IT| ¹²⁹Sb| 23/2+|||-id=Antimony-130| ¹³⁰Sb| style="text-align:right" | 51| style="text-align:right" | 79| 129.911663(15)| 39.5(8) min| β⁻| ¹³⁰Te| 8−|||-id=Antimony-130m1| style="text-indent:1em" | ^130m1Sb| colspan="3" style="text-indent:2em" | 4.80(20) keV| 6.3(2) min| β⁻| ¹³⁰Te| 4+|||-id=Antimony-130m2| style="text-indent:1em" | ^130m2Sb| colspan="3" style="text-indent:2em" | 84.67(4) keV| 800(100) ns| IT| ¹³⁰Sb| 6−|||-id=Antimony-130m3| style="text-indent:1em" | ^130m3Sb| colspan="3" style="text-indent:2em" | 1508(1) keV| 600(15) ns| IT| ¹³⁰Sb| (11+)|||-id=Antimony-130m4| style="text-indent:1em" | ^130m4Sb| colspan="3" style="text-indent:2em" | 1544.7(5) keV| 1.25(1) μs| IT| ¹³⁰Sb| (13+)|||-id=Antimony-131| ¹³¹Sb| style="text-align:right" | 51| style="text-align:right" | 80| 130.9119893(22)| 23.03(4) min| β⁻| ¹³¹Te| 7/2+|||-id=Antimony-131m1| style="text-indent:1em" | ^131m1Sb| colspan="3" style="text-indent:2em" | 1676.06(6) keV| 64.2(26) μs| IT| ¹³¹Sb| 15/2−|||-id=Antimony-131m2| style="text-indent:1em" | ^131m2Sb| colspan="3" style="text-indent:2em" | 1687.2(9) keV| 4.3(8) μs| IT| ¹³¹Sb| 19/2−|||-id=Antimony-131m3| style="text-indent:1em" | ^131m3Sb| colspan="3" style="text-indent:2em" | 2165.6(15) keV| 0.97(3) μs| IT| ¹³¹Sb| 23/2+|||-id=Antimony-132| ¹³²Sb| style="text-align:right" | 51| style="text-align:right" | 81| 131.9145141(29)^[3] | 2.79(7) min| β⁻| ¹³²Te| (4)+|||-id=Antimony-132m1| style="text-indent:1em" | ^132m1Sb| colspan="3" style="text-indent:2em" | 139.3(20) keV^[3] | 4.10(5) min| β⁻| ¹³²Te| (8−)|||-id=Antimony-132m2| style="text-indent:1em" | ^132m2Sb| colspan="3" style="text-indent:2em" | 254.5(3) keV| 102(4) ns| IT| ¹³²Sb| (6−)|||-id=Antimony-133| ¹³³Sb| style="text-align:right" | 51| style="text-align:right" | 82| 132.9152721(34)| 2.34(5) min| β⁻| ¹³³Te| (7/2+)|||-id=Antimony-133m| style="text-indent:1em" | ^133mSb| colspan="3" style="text-indent:2em" | 4541(9) keV| 16.54(19) μs| IT| ¹³³Sb| (21/2+)|||-id=Antimony-134| rowspan=2|¹³⁴Sb| rowspan=2 style="text-align:right" | 51| rowspan=2 style="text-align:right" | 83| rowspan=2|133.9205373(33)| rowspan=2|674(4) ms| β⁻| ¹³⁴Te| rowspan=2|(0-)| rowspan=2|| rowspan=2||-| β⁻, n?| ¹³³Te|-id=Antimony-134m| rowspan=2 style="text-indent:1em" | ^134mSb| rowspan=2 colspan="3" style="text-indent:2em" | 279(1) keV| rowspan=2|10.01(4) s| β⁻ (99.91%)| ¹³⁴Te| rowspan=2|(7−)| rowspan=2|| rowspan=2||-| β⁻, n (0.088%)| ¹³³Te|-id=Antimony-135| rowspan=2|¹³⁵Sb| rowspan=2 style="text-align:right" | 51| rowspan=2 style="text-align:right" | 84| rowspan=2|134.9251844(28)| rowspan=2|1.668(9) s| β⁻ (80.9%)| ¹³⁵Te| rowspan=2|(7/2+)| rowspan=2|| rowspan=2||-| β⁻, n (19.1%)| ¹³⁴Te|-id=Antimony-136| rowspan=3|¹³⁶Sb| rowspan=3 style="text-align:right" | 51| rowspan=3 style="text-align:right" | 85| rowspan=3|135.9307490(63)| rowspan=3|0.923(14) s| β⁻ (75.2%)| ¹³⁶Te| rowspan=3|(1−)| rowspan=3|| rowspan=3||-| β⁻, n (24.7%)| ¹³⁵Te|-| β⁻, 2n (0.14%)| ¹³⁴Te|-id=Antimony-136m| style="text-indent:1em" | ^136mSb| colspan="3" style="text-indent:2em" | 269.3(5) keV| 570(5) ns| IT| ¹³⁶Sb| (6−)|||-id=Antimony-137| rowspan=3|¹³⁷Sb| rowspan=3 style="text-align:right" | 51| rowspan=3 style="text-align:right" | 86| rowspan=3|136.935523(56)| rowspan=3|497(21) ms| β⁻ (51%)| ¹³⁷Te| rowspan=3|7/2+#| rowspan=3|| rowspan=3||-| β⁻, n (49%)| ¹³⁶Te|-| β⁻, 2n?| ¹³⁵Te|-id=Antimony-138| rowspan=3|¹³⁸Sb| rowspan=3 style="text-align:right" | 51| rowspan=3 style="text-align:right" | 87| rowspan=3|137.94133(32)#| rowspan=3|333(7) ms| β⁻, n (72%)| ¹³⁷Te| rowspan=3|(3−)| rowspan=3|| rowspan=3||-| β⁻ (28%)| ¹³⁸Te|-| β⁻, 2n?| ¹³⁶Te|-id=Antimony-139| rowspan=3|¹³⁹Sb| rowspan=3 style="text-align:right" | 51| rowspan=3 style="text-align:right" | 88| rowspan=3|138.94627(43)#| rowspan=3|182(9) ms| β⁻, n (90%)| ¹³⁸Te| rowspan=3|7/2+#| rowspan=3|| rowspan=3||-| β⁻ (10%)| ¹³⁹Te|-| β⁻, 2n?| ¹³⁷Te|-id=Antimony-140| rowspan=3|¹⁴⁰Sb| rowspan=3 style="text-align:right" | 51| rowspan=3 style="text-align:right" | 89| rowspan=3|139.95235(64)#| rowspan=3|170(6) ms| β⁻ (69%)| ¹⁴⁰Te| rowspan=3|(3−)| rowspan=3|| rowspan=3||-| β⁻, n (23%)| ¹³⁹Te|-| β⁻, 2n (7.6%)| ¹³⁸Te|-id=Antimony-140m| style="text-indent:1em" | ^140mSb| colspan="3" style="text-indent:2em" | 330(30)# keV| 41(8) μs| IT| ¹⁴⁰Sb| (6−,7−)|||-id=Antimony-141| rowspan=3|¹⁴¹Sb| rowspan=3 style="text-align:right" | 51| rowspan=3 style="text-align:right" | 90| rowspan=3|140.95755(54)#| rowspan=3|103(29) ms| β⁻| ¹⁴¹Te| rowspan=3|7/2+#| rowspan=3|| rowspan=3||-| β⁻, n?| ¹⁴⁰Te|-| β⁻, 2n?| ¹³⁹Te|-id=Antimony-142| rowspan=3|¹⁴²Sb| rowspan=3 style="text-align:right" | 51| rowspan=3 style="text-align:right" | 91| rowspan=3|141.96392(32)#| rowspan=3|80(50) ms| β⁻| ¹⁴²Te| rowspan=3|| rowspan=3|| rowspan=3||-| β⁻, n?| ¹⁴¹Te|-| β⁻, 2n?| ¹³⁰Te

References

• Isotope masses from:
  • • Isotopic compositions and standard atomic masses from:
      • • Half-life, spin, and isomer data selected from the following sources.

Notes and References

1. Order of ground state and isomer is uncertain.
2. [Fission product]
3. Jaries . A. . Stryjczyk . M. . Kankainen . A. . Ayoubi . L. Al . Beliuskina . O. . Canete . L. . de Groote . R. P. . Delafosse . C. . Delahaye . P. . Eronen . T. . Flayol . M. . Ge . Z. . Geldhof . S. . Gins . W. . Hukkanen . M. . Imgram . P. . Kahl . D. . Kostensalo . J. . Kujanpää . S. . Kumar . D. . Moore . I. D. . Mougeot . M. . Nesterenko . D. A. . Nikas . S. . Patel . D. . Penttilä . H. . Pitman-Weymouth . D. . Pohjalainen . I. . Raggio . A. . Ramalho . M. . Reponen . M. . Rinta-Antila . S. . de Roubin . A. . Ruotsalainen . J. . Srivastava . P. C. . Suhonen . J. . Vilen . M. . Virtanen . V. . Zadvornaya . A. . Physical Review C - Accepted Paper: Isomeric states of fission fragments explored via Penning trap mass spectrometry at IGISOL . journals.aps.org . 2403.04710.