Isotopes of antimony

Antimony (Sb) occurs naturally as two stable isotopes, Sb (57.21%) and Sb (42.79%). There are 37 artificial radioactive isotopes known with mass numbers 104 to 142, the lightest two of which (Sb) are beyond the proton drip line. Isotopes that are lighter than the stable isotopes tend to decay by β+, and those that are heavier tend to decay by β−; the intermediate Sb is observed to decay in both ways.

The longest-lived radioisotopes of antimony are: the minor fission product Sb, with a half-life of 2.758 years; Sb, with half-life 60.20 days; and Sb, with half-life 12.35 days. All other isotopes have half-lives less than 4 days, most less than an hour. Of the numerous isomers reported, the longest-lived is Sb with half-life 5.76 days; this nuclide has not been confirmed not to be the ground state.

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|103.936331(24) | rowspan=4 style="text-align:center" | 1995 | 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 style="text-align:center" | 1994 | 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) | style="text-align:center" | 1981 | 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 | style="text-align:center" | 1999 | 226(14) ns | IT | 106Sb | (4+)

|-id=Antimony-107 | 107Sb | style="text-align:right" | 51 | style="text-align:right" | 56 | 106.9241506(45) | style="text-align:center" | 1994 | 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) | style="text-align:center" | 1976 | 7.4(3) s | β+ | 108Sn | (4+)

|-id=Antimony-109 | 109Sb | style="text-align:right" | 51 | style="text-align:right" | 58 | 108.9181412(57) | style="text-align:center" | 1976 | 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) | style="text-align:center" | 1972 | 23.6(3) s | β+ | 110Sn | (3+)

|-id=Antimony-111 | 111Sb | style="text-align:right" | 51 | style="text-align:right" | 60 | 110.9132182(95) | style="text-align:center" | 1972 | 75(1) s | β+ | 111Sn | (5/2+)

|-id=Antimony-112 | 112Sb | style="text-align:right" | 51 | style="text-align:right" | 61 | 111.912400(19) | style="text-align:center" | 1959 | 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 | style="text-align:center" | 1976 | 536(22) ns | IT | 112Sb | (8−)

|-id=Antimony-113 | 113Sb | style="text-align:right" | 51 | style="text-align:right" | 62 | 112.909375(18) | style="text-align:center" | 1958 | 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) | style="text-align:center" | 1959 | 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 | style="text-align:center" | 1973 | 219(12) μs | IT | 114Sb | (8−)

|-id=Antimony-115 | 115Sb | style="text-align:right" | 51 | style="text-align:right" | 64 | 114.906598(17) | style="text-align:center" | 1958 | 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 | style="text-align:center" | 1977 | 159(3) ns | IT | 115Sb | (19/2)−

|-id=Antimony-116 | 116Sb | style="text-align:right" | 51 | style="text-align:right" | 65 | 115.9067927(55) | style="text-align:center" | 1949 | 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 | style="text-align:center" | 1976 | 194(4) ns | IT | 116Sb | 1+

|-id=Antimony-116m2 | style="text-indent:1em" | 116m2Sb | colspan="3" style="text-indent:2em" | 390(40) keV | style="text-align:center" | 1954 | 60.3(6) min | β+ | 116Sn | 8−

|-id=Antimony-117 | 117Sb | style="text-align:right" | 51 | style="text-align:right" | 66 | 116.9048415(91) | style="text-align:center" | 1947 | 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 | style="text-align:center" | 1970 | 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 | style="text-align:center" | 1987 | 290(5) ns | IT | 117Sb | (23/2−)

|-id=Antimony-118 | 118Sb | style="text-align:right" | 51 | style="text-align:right" | 67 | 117.9055322(32) | style="text-align:center" | 1947 | 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 | style="text-align:center" | 1975 | 20.6(6) μs | IT | 118Sb | 3+

|-id=Antimony-118m2 | style="text-indent:1em" | 118m2Sb | colspan="3" style="text-indent:2em" | 250(6) keV | style="text-align:center" | 1948 | 5.01(3) h | β+ | 118Sn | 8−

|-id=Antimony-119 | 119Sb | style="text-align:right" | 51 | style="text-align:right" | 68 | 118.9039441(75) | style="text-align:center" | 1947 | 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 | style="text-align:center" | 1987 | 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 | style="text-align:center" | 1979 | 835(81) ms | IT | 119Sb | 25/2+

|-id=Antimony-120 | 120Sb | style="text-align:right" | 51 | style="text-align:right" | 69 | 119.9050803(77) | style="text-align:center" | 1937 | 15.89(4) min | β+ | 120Sn | 1+

|-id=Antimony-120m1 | style="text-indent:1em" | 120m1SbOrder of ground state and isomer is uncertain. | colspan="3" style="text-indent:2em" | 0(100)# keV | style="text-align:center" | 1948 | 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 | style="text-align:center" | 1976 | 246(2) ns | IT | 120Sb | (3+)

|-id=Antimony-120m3 | style="text-indent:1em" | 120m3Sb | colspan="3" style="text-indent:2em" | 2328(100)# keV | style="text-align:center" | 1987 | 400(8) ns | IT | 120Sb | 13+

|-id=Antimony-121 | 121Sbfission product | style="text-align:right" | 51 | style="text-align:right" | 70 | 120.9038114(27) | style="text-align:center" | 1922 | 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 | style="text-align:center" | 2009 | 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 style="text-align:center" | 1939 | 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 | style="text-align:center" | 1962 | 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 | style="text-align:center" | 1962 | 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 | style="text-align:center" | 1947 | 4.191(3) min | IT | 122Sb | 8−

|-id=Antimony-123 | 123Sb | style="text-align:right" | 51 | style="text-align:right" | 72 | 122.9042153(15) | style="text-align:center" | 1922 | 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 | style="text-align:center" | 2008 | 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 | style="text-align:center" | 2007 | 65(1) μs | IT | 123Sb | 23/2+

|-id=Antimony-124 | 124Sb | style="text-align:right" | 51 | style="text-align:right" | 73 | 123.9059371(15) | style="text-align:center" | 1939 | 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 style="text-align:center" | 1947 | 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 | style="text-align:center" | 1947 | 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 | style="text-align:center" | 1980 | 3.2(3) μs | IT | 124Sb | (3+)

|-id=Antimony-125 | 125Sb | style="text-align:right" | 51 | style="text-align:right" | 74 | 124.9052543(27) | style="text-align:center" | 1951 | 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 | style="text-align:center" | 2007 | 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 | style="text-align:center" | 2007 | 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 | style="text-align:center" | 2007 | 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) | style="text-align:center" | 1956 | 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 style="text-align:center" | 1961 | 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 | style="text-align:center" | 1976 | ~11 s | IT | 126m1Sb | 3−

|-id=Antimony-126m3 | style="text-indent:1em" | 126m3Sb | colspan="3" style="text-indent:2em" | 104.6(3) keV | style="text-align:center" | 1971 | 553(5) ns | IT | 126Sb | 3+

|-id=Antimony-126m4 | style="text-indent:1em" | 126m4Sb | colspan="3" style="text-indent:2em" | 1810.7(17) keV | style="text-align:center" | 2019 | 90(16) ns | IT | 126Sb | (13+)

|-id=Antimony-127 | 127Sb | style="text-align:right" | 51 | style="text-align:right" | 76 | 126.9069256(55) | style="text-align:center" | 1939 | 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 | style="text-align:center" | 1974 | 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 | style="text-align:center" | 2005 | 269(5) ns | IT | 127Sb | 23/2+

|-id=Antimony-128 | 128Sb | style="text-align:right" | 51 | style="text-align:right" | 77 | 127.909146(20) | style="text-align:center" | 1956 | 9.05(4) h | β− | 128Te | 8−

Isotopes of antimony

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