鈣的同位素

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)#
| <35 ns
| 
| 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 (<.1%)
| 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+
|
|
|-
| 在质子数和中子数相等，且未观测到放射性衰变的核素中最重
| style="text-align:right" | 20
| style="text-align:right" | 20
| 39.96259098(22)
| colspan=3 align=center|觀測上穩定被认为会双电子捕获成40Ar，半衰期超过5.9×1021年
| 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|觀測上穩定被认为会双β衰变成46Ti，半衰期超过2.8×1015年
| 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−
|
|
|-
| 放射性同位素
| style="text-align:right" | 20
| style="text-align:right" | 28
| 47.952534(4)
| 43(38)×1018 y
| β−β−已知会雙β衰變的最轻核素
| 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 (<.1%)
| 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 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 Atomic weights of the elements. Review 2000 (IUPAC Technical Report) . Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and 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. 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 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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Category:鈣