鈣（原子量：40.078(4)）共有24個同位素，其中有5個是穩定的。
圖表
|-
|
| style="text-align:right" | 20
| style="text-align:right" | 14
| 34.01412(32)#
| 33K
| 0+
|
|
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 20
| rowspan=2 style="text-align:right" | 15
| rowspan=2|35.00494(21)#
| rowspan=2|25.7(2) ms
| β+ (>99.9%)
| 35K
| rowspan=2|1/2+#
| rowspan=2|
| rowspan=2|
|-
| β+, p (34Ar
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 20
| rowspan=2 style="text-align:right" | 16
| rowspan=2|35.99309(4)
| rowspan=2|102(2) ms
| β+, p (56.8%)
| 35Ar
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β+ (43.2%)
| 36K
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 20
| rowspan=2 style="text-align:right" | 17
| rowspan=2|36.985870(24)
| rowspan=2|181.1(10) ms
| β+, p (74.5%)
| 36Ar
| rowspan=2|(3/2+)
| rowspan=2|
| rowspan=2|
|-
| β+ (25.5%)
| 37K
|-
|
| style="text-align:right" | 20
| style="text-align:right" | 18
| 37.976318(5)
| 440(8) ms
| β+
| 38K
| 0+
|
|
|-
|
| style="text-align:right" | 20
| style="text-align:right" | 19
| 38.9707197(20)
| 859.6(14) ms
| β+
| 39K
| 3/2+
|
|
|-
|
| style="text-align:right" | 20
| style="text-align:right" | 20
| 39.96259098(22)
| colspan=3 align=center|觀測上穩定
| 0+
| 0.96941(156)
| 0.96933–0.96947
|-
|
| style="text-align:right" | 20
| style="text-align:right" | 21
| 40.96227806(26)
| 1.02(7)×105 y
|
| 41K
| 7/2−
| 痕量
|
|-
|
| style="text-align:right" | 20
| style="text-align:right" | 22
| 41.95861801(27)
| colspan=3 align=center|穩定
| 0+
| 0.00647(23)
| 0.00646–0.00648
|-
|
| style="text-align:right" | 20
| style="text-align:right" | 23
| 42.9587666(3)
| colspan=3 align=center|穩定
| 7/2−
| 0.00135(10)
| 0.00135–0.00135
|-
|
| style="text-align:right" | 20
| style="text-align:right" | 24
| 43.9554818(4)
| colspan=3 align=center|穩定
| 0+
| 0.02086(110)
| 0.02082–0.02092
|-
|
| style="text-align:right" | 20
| style="text-align:right" | 25
| 44.9561866(4)
| 162.67(25) d
| β−
| 45Sc
| 7/2−
|
|
|-
|
| style="text-align:right" | 20
| style="text-align:right" | 26
| 45.9536926(24)
| colspan=3 align=center|觀測上穩定
| 0+
| 4(3)×10−5
| 4×10−5–4×10−5
|-
|
| style="text-align:right" | 20
| style="text-align:right" | 27
| 46.9545460(24)
| 4.536(3) d
| β−
| 47Sc
| 7/2−
|
|
|-
|
| style="text-align:right" | 20
| style="text-align:right" | 28
| 47.952534(4)
| 43(38)×1018 y
| β−β−
| 48Ti
| 0+
| 0.00187(21)
| 0.00186–0.00188
|-
|
| style="text-align:right" | 20
| style="text-align:right" | 29
| 48.955674(4)
| 8.718(6) min
| β−
| 49Sc
| 3/2−
|
|
|-
|
| style="text-align:right" | 20
| style="text-align:right" | 30
| 49.957519(10)
| 13.9(6) s
| β−
| 50Sc
| 0+
|
|
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 20
| rowspan=2 style="text-align:right" | 31
| rowspan=2|50.9615(1)
| rowspan=2|10.0(8) s
| β− (>99.9%)
| 51Sc
| rowspan=2|(3/2−)#
| rowspan=2|
| rowspan=2|
|-
| β−, n (50Sc
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 20
| rowspan=2 style="text-align:right" | 32
| rowspan=2|51.96510(75)
| rowspan=2|4.6(3) s
| β− (98%)
| 52Sc
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β−, n (2%)
| 51Sc
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 20
| rowspan=2 style="text-align:right" | 33
| rowspan=2|52.97005(54)#
| rowspan=2|90(15) ms
| β− (70%)
| 53Sc
| rowspan=2|3/2−#
| rowspan=2|
| rowspan=2|
|-
| β−, n (30%)
| 52Sc
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 20
| rowspan=2 style="text-align:right" | 34
| rowspan=2|53.97435(75)#
| rowspan=2|50# ms [>300 ns]
| β−, n
| 53Sc
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β−
| 54Sc
|-
|
| style="text-align:right" | 20
| style="text-align:right" | 35
| 54.98055(75)#
| 30# ms [>300 ns]
| β−
| 55Sc
| 5/2−#
|
|
|-
|
| style="text-align:right" | 20
| style="text-align:right" | 36
| 55.98557(97)#
| 10# ms [>300 ns]
| β−
| 56Sc
| 0+
|
|
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 20
| rowspan=2 style="text-align:right" | 37
| rowspan=2|56.99236(107)#
| rowspan=2|5# ms
| β−
| 57Sc
| rowspan=2|5/2−#
| rowspan=2|
| rowspan=2|
|-
| β−, n
| 56Sc
|-
|
| style="text-align:right" | 20
| style="text-align:right" | 38
| (57.962133)#
|
|
|
| (0+)#
|
|
|}
参考文獻
- Isotope masses from [https://web.archive.org/web/20080923134436/http://www.nndc.bnl.gov/amdc/index.html Ame2003 Atomic Mass Evaluation] by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
- Isotopic compositions and standard atomic masses from [http://www.iupac.org/publications/pac/2003/7506/7506x0683.html Atomic weights of the elements. Review 2000 (IUPAC Technical Report)] . Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and [http://www.iupac.org/news/archives/2005/atomic-weights_revised05.html Atomic Weights Revised (2005)] .
- Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
** Audi, Bersillon, Blachot, Wapstra. [http://amdc.in2p3.fr/web/nubase_en.html The Nubase2003 evaluation of nuclear and decay properties] , Nuc. Phys. A 729, pp. 3-128 (2003).
** National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the [http://www.nndc.bnl.gov/nudat2/ NuDat 2.1 database] (retrieved Sept. 2005).
* David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition*, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.
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