Isotopes of scandium

Naturally occurring scandium (21Sc) is composed of one stable isotope, 45Sc. Twenty-five radioisotopes have been characterized, with the most stable being 46Sc with a half-life of 83.8 days, 47Sc with a half-life of 3.35 days, and 48Sc with a half-life of 43.7 hours and 44Sc with a half-life of 3.97 hours. All the remaining isotopes have half-lives that are less than four hours, and the majority of these have half-lives that are less than two minutes, the least stable being proton unbound 39Sc with a half-life shorter than 300 nanoseconds. This element also has 13 meta states with the most stable being 44m2Sc (t1/2 58.6 h).

The isotopes of scandium range in atomic weight from 39 u (39Sc) to 62 u (62Sc). The primary decay mode at masses lower than the only stable isotope, 45Sc, is beta-plus or electron capture, and the primary mode at masses above it is beta-minus. The primary decay products at atomic weights below 45Sc are calcium isotopes and the primary products from higher atomic weights are titanium isotopes.

List of isotopes

 * 39Sc
 * style="text-align:right" | 21
 * style="text-align:right" | 18
 * 38.984790(26)
 * <300 ns
 * p
 * 38Ca
 * (7/2−)#
 * rowspan=3|40Sc
 * rowspan=3 style="text-align:right" | 21
 * rowspan=3 style="text-align:right" | 19
 * rowspan=3|39.977967(3)
 * rowspan=3|182.3(7) ms
 * β+ (99.54%)
 * 40Ca
 * rowspan=3|4−
 * rowspan=3|
 * β+, p (.44%)
 * 39K
 * β+, α (.017%)
 * 36Ar
 * 41Sc
 * style="text-align:right" | 21
 * style="text-align:right" | 20
 * 40.96925113(24)
 * 596.3(17) ms
 * β+
 * 41Ca
 * 7/2−
 * 42Sc
 * style="text-align:right" | 21
 * style="text-align:right" | 21
 * 41.96551643(29)
 * 681.3(7) ms
 * β+
 * 42Ca
 * 0+
 * style="text-indent:1em" | 42mSc
 * colspan="3" style="text-indent:2em" | 616.28(6) keV
 * 61.7(4) s
 * β+
 * 42Ca
 * (7, 5, 6)+
 * 43Sc
 * style="text-align:right" | 21
 * style="text-align:right" | 22
 * 42.9611507(20)
 * 3.891(12) h
 * β+
 * 43Ca
 * 7/2−
 * style="text-indent:1em" | 43m1Sc
 * colspan="3" style="text-indent:2em" | 151.4(2) keV
 * 438(7) μs
 * 3/2+
 * style="text-indent:1em" | 43m2Sc
 * colspan="3" style="text-indent:2em" | 3123.2(3) keV
 * 470(4) ns
 * (19/2)−
 * 44Sc
 * style="text-align:right" | 21
 * style="text-align:right" | 23
 * 43.9594028(19)
 * 3.97(4) h
 * β+
 * 44Ca
 * 2+
 * style="text-indent:1em" | 44m1Sc
 * colspan="3" style="text-indent:2em" | 67.8680(14) keV
 * 154.2(8) ns
 * 1−
 * rowspan=2 style="text-indent:1em" | 44m2Sc
 * rowspan=2 colspan="3" style="text-indent:2em" | 270.95(20) keV
 * rowspan=2|58.61(10) h
 * IT (98.8%)
 * 44Sc
 * rowspan=2| 6+
 * rowspan=2|
 * β+ (1.2%)
 * 44Ca
 * style="text-indent:1em" | 44m3Sc
 * colspan="3" style="text-indent:2em" | 146.224(22) keV
 * 50.4(7) μs
 * 0−
 * 45Sc
 * style="text-align:right" | 21
 * style="text-align:right" | 24
 * 44.9559119(9)
 * colspan=3 align=center|Stable
 * 7/2−
 * 1.0000
 * style="text-indent:1em" | 45mSc
 * colspan="3" style="text-indent:2em" | 12.40(5) keV
 * 318(7) ms
 * IT
 * 45Sc
 * 3/2+
 * 46Sc
 * style="text-align:right" | 21
 * style="text-align:right" | 25
 * 45.9551719(9)
 * 83.79(4) d
 * β−
 * 46Ti
 * 4+
 * style="text-indent:1em" | 46m1Sc
 * colspan="3" style="text-indent:2em" | 52.011(1) keV
 * 9.4(8) μs
 * 6+
 * style="text-indent:1em" | 46m2Sc
 * colspan="3" style="text-indent:2em" | 142.528(7) keV
 * 18.75(4) s
 * IT
 * 46Sc
 * 1−
 * 47Sc
 * style="text-align:right" | 21
 * style="text-align:right" | 26
 * 46.9524075(22)
 * 3.3492(6) d
 * β−
 * 47Ti
 * 7/2−
 * style="text-indent:1em" | 47mSc
 * colspan="3" style="text-indent:2em" | 766.83(9) keV
 * 272(8) ns
 * (3/2)+
 * 48Sc
 * style="text-align:right" | 21
 * style="text-align:right" | 27
 * 47.952231(6)
 * 43.67(9) h
 * β−
 * 48Ti
 * 6+
 * 49Sc
 * style="text-align:right" | 21
 * style="text-align:right" | 28
 * 48.950024(4)
 * 57.2(2) min
 * β−
 * 49Ti
 * 7/2−
 * 50Sc
 * style="text-align:right" | 21
 * style="text-align:right" | 29
 * 49.952188(17)
 * 102.5(5) s
 * β−
 * 50Ti
 * 5+
 * rowspan=2 style="text-indent:1em" | 50mSc
 * rowspan=2 colspan="3" style="text-indent:2em" | 256.895(10) keV
 * rowspan=2|350(40) ms
 * IT (97.5%)
 * 50Sc
 * rowspan=2|2+, 3+
 * rowspan=2|
 * β− (2.5%)
 * 50Ti
 * 51Sc
 * style="text-align:right" | 21
 * style="text-align:right" | 30
 * 50.953603(22)
 * 12.4(1) s
 * β−
 * 51Ti
 * (7/2)−
 * 52Sc
 * style="text-align:right" | 21
 * style="text-align:right" | 31
 * 51.95668(21)
 * 8.2(2) s
 * β−
 * 52Ti
 * 3(+)
 * rowspan=2|53Sc
 * rowspan=2 style="text-align:right" | 21
 * rowspan=2 style="text-align:right" | 32
 * rowspan=2|52.95961(32)#
 * rowspan=2|2.4(0.6) s
 * β− (>99.9%)
 * 53Ti
 * rowspan=2|(7/2−)#
 * rowspan=2|
 * β−, n (<.1%)
 * 52Ti
 * rowspan=2|54Sc
 * rowspan=2 style="text-align:right" | 21
 * rowspan=2 style="text-align:right" | 33
 * rowspan=2|53.96326(40)
 * rowspan=2|260(30) ms
 * β− (>99.9%)
 * 54Ti
 * rowspan=2|3+#
 * rowspan=2|
 * β−, n (<.1%)
 * 53Ti
 * style="text-indent:1em" | 54mSc
 * colspan="3" style="text-indent:2em" | 110(3) keV
 * 7(5) μs
 * (5+)
 * rowspan=2|55Sc
 * rowspan=2 style="text-align:right" | 21
 * rowspan=2 style="text-align:right" | 34
 * rowspan=2|54.96824(79)
 * rowspan=2|0.115(15) s
 * β− (>99.9%)
 * 55Ti
 * rowspan=2|7/2−#
 * rowspan=2|
 * β−, n (<.1%)
 * 54Ti
 * 56Sc
 * style="text-align:right" | 21
 * style="text-align:right" | 35
 * 55.97287(75)#
 * 35(5) ms
 * β−
 * 56Ti
 * (1+)
 * 57Sc
 * style="text-align:right" | 21
 * style="text-align:right" | 36
 * 56.97779(75)#
 * 13(4) ms
 * β−
 * 57Ti
 * 7/2−#
 * 58Sc
 * style="text-align:right" | 21
 * style="text-align:right" | 37
 * 57.98371(86)#
 * 12(5) ms
 * β−
 * 58Ti
 * (3+)#
 * rowspan=2|59Sc
 * rowspan=2 style="text-align:right" | 21
 * rowspan=2 style="text-align:right" | 38
 * rowspan=2|58.98922(97)#
 * rowspan=2|10# ms
 * β−, n
 * 58Ti
 * rowspan=2|7/2−#
 * rowspan=2|
 * β−
 * 59Ti
 * rowspan=3|60Sc
 * rowspan=3 style="text-align:right" | 21
 * rowspan=3 style="text-align:right" | 39
 * rowspan=3|59.99571(97)#
 * rowspan=3|3# ms (>620 ns)
 * β−
 * 60Ti
 * rowspan=3|3+#
 * rowspan=3|
 * β−, n
 * 59Ti
 * β−, 2n
 * 58Ti
 * rowspan=3|61Sc
 * rowspan=3 style="text-align:right" | 21
 * rowspan=3 style="text-align:right" | 40
 * rowspan=3|61.001(600)#
 * rowspan=3|2# ms (>620 ns)
 * β−
 * 61Ti
 * rowspan=3|7/2-#
 * rowspan=3|
 * β−, n
 * 60Ti
 * β−, 2n
 * 59Ti
 * rowspan=3|62Sc
 * rowspan=3 style="text-align:right" | 21
 * rowspan=3 style="text-align:right" | 41
 * rowspan=3|62.00785(64)#
 * rowspan=3|2# ms (>400 ns)
 * β−?
 * 62Ti
 * rowspan=3|
 * rowspan=3|
 * β−, n?
 * 61Ti
 * β−, 2n?
 * 60Ti
 * style="text-align:right" | 21
 * style="text-align:right" | 35
 * 55.97287(75)#
 * 35(5) ms
 * β−
 * 56Ti
 * (1+)
 * 57Sc
 * style="text-align:right" | 21
 * style="text-align:right" | 36
 * 56.97779(75)#
 * 13(4) ms
 * β−
 * 57Ti
 * 7/2−#
 * 58Sc
 * style="text-align:right" | 21
 * style="text-align:right" | 37
 * 57.98371(86)#
 * 12(5) ms
 * β−
 * 58Ti
 * (3+)#
 * rowspan=2|59Sc
 * rowspan=2 style="text-align:right" | 21
 * rowspan=2 style="text-align:right" | 38
 * rowspan=2|58.98922(97)#
 * rowspan=2|10# ms
 * β−, n
 * 58Ti
 * rowspan=2|7/2−#
 * rowspan=2|
 * β−
 * 59Ti
 * rowspan=3|60Sc
 * rowspan=3 style="text-align:right" | 21
 * rowspan=3 style="text-align:right" | 39
 * rowspan=3|59.99571(97)#
 * rowspan=3|3# ms (>620 ns)
 * β−
 * 60Ti
 * rowspan=3|3+#
 * rowspan=3|
 * β−, n
 * 59Ti
 * β−, 2n
 * 58Ti
 * rowspan=3|61Sc
 * rowspan=3 style="text-align:right" | 21
 * rowspan=3 style="text-align:right" | 40
 * rowspan=3|61.001(600)#
 * rowspan=3|2# ms (>620 ns)
 * β−
 * 61Ti
 * rowspan=3|7/2-#
 * rowspan=3|
 * β−, n
 * 60Ti
 * β−, 2n
 * 59Ti
 * rowspan=3|62Sc
 * rowspan=3 style="text-align:right" | 21
 * rowspan=3 style="text-align:right" | 41
 * rowspan=3|62.00785(64)#
 * rowspan=3|2# ms (>400 ns)
 * β−?
 * 62Ti
 * rowspan=3|
 * rowspan=3|
 * β−, n?
 * 61Ti
 * β−, 2n?
 * 60Ti
 * rowspan=3|62Sc
 * rowspan=3 style="text-align:right" | 21
 * rowspan=3 style="text-align:right" | 41
 * rowspan=3|62.00785(64)#
 * rowspan=3|2# ms (>400 ns)
 * β−?
 * 62Ti
 * rowspan=3|
 * rowspan=3|
 * β−, n?
 * 61Ti
 * β−, 2n?
 * 60Ti
 * β−, 2n?
 * 60Ti
 * 60Ti