硒(原子量:78.96(3))共有39個同位素,其中有5個同位素是穩定的。
Quick Facts 同位素, 衰變 ...
主要的硒同位素
同位素
|
衰變
|
|
豐度
|
半衰期 (t1/2)
|
方式
|
能量 (MeV)
|
產物
|
72Se
|
人造
|
8.40 天
|
ε
|
0.362
|
72As
|
74Se
|
0.86%
|
穩定,帶40粒中子
|
75Se
|
人造
|
119.78 天
|
ε
|
0.865
|
75As
|
76Se
|
9.23%
|
穩定,帶42粒中子
|
77Se
|
7.60%
|
穩定,帶43粒中子
|
78Se
|
23.69%
|
穩定,帶44粒中子
|
79Se
|
痕量
|
3.27×105 年
|
β−
|
0.151
|
79Br
|
80Se
|
49.80%
|
穩定,帶46粒中子
|
82Se
|
8.82%
|
8.69×1019 年[1]
|
β−β−
|
2.998
|
82Kr
| |
標準原子質量 (Ar, 標準) | |
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Close
More information 符號, Z ...
符號
|
Z
|
N
|
同位素質量(u) [n 1][n 2]
|
半衰期 [n 1][n 2][n 3]
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衰變 方式[3]
|
衰變 產物 [n 4]
|
原子核 自旋[n 1]
|
相對豐度 (莫耳分率)[n 2]
|
相對豐度 的變化量 (莫耳分率)
|
激發能量[n 2]
|
65Se
|
34
|
31
|
64.96466(64)#
|
<50 ms
|
β+ (>99.9%)
|
65As
|
3/2-#
|
|
|
β+, p (<.1%)
|
64Ge
|
66Se
|
34
|
32
|
65.95521(32)#
|
33(12) ms
|
β+
|
66As
|
0+
|
|
|
67Se
|
34
|
33
|
66.95009(21)#
|
133(11) ms
|
β+ (99.5%)
|
67As
|
5/2-#
|
|
|
β+, p (.5%)
|
66Ge
|
68Se
|
34
|
34
|
67.94180(4)
|
35.5(7) s
|
β+
|
68As
|
0+
|
|
|
69Se
|
34
|
35
|
68.93956(4)
|
27.4(2) s
|
β+ (99.955%)
|
69As
|
(1/2-)
|
|
|
β+, p (.045%)
|
68Ge
|
69m1Se
|
39.4(1) keV
|
2.0(2) µs
|
|
|
5/2-
|
|
|
69m2Se
|
573.9(10) keV
|
955(16) ns
|
|
|
9/2+
|
|
|
70Se
|
34
|
36
|
69.93339(7)
|
41.1(3) min
|
β+
|
70As
|
0+
|
|
|
71Se
|
34
|
37
|
70.93224(3)
|
4.74(5) min
|
β+
|
71As
|
5/2-
|
|
|
71m1Se
|
48.79(5) keV
|
5.6(7) µs
|
|
|
1/2- to 9/2-
|
|
|
71m2Se
|
260.48(10) keV
|
19.0(5) µs
|
|
|
(9/2)+
|
|
|
72Se
|
34
|
38
|
71.927112(13)
|
8.40(8) d
|
ε
|
72As
|
0+
|
|
|
73Se
|
34
|
39
|
72.926765(11)
|
7.15(8) h
|
β+
|
73As
|
9/2+
|
|
|
73mSe
|
25.71(4) keV
|
39.8(13) min
|
IT
|
73Se
|
3/2-
|
|
|
β+
|
73As
|
74Se
|
34
|
40
|
73.9224764(18)
|
觀測上穩定 [n 5]
|
0+
|
0.0089(4)
|
|
75Se
|
34
|
41
|
74.9225234(18)
|
119.779(4) d
|
ε
|
75As
|
5/2+
|
|
|
76Se
|
34
|
42
|
75.9192136(18)
|
穩定
|
0+
|
0.0937(29)
|
|
77Se
|
34
|
43
|
76.9199140(18)
|
穩定
|
1/2-
|
0.0763(16)
|
|
77mSe
|
161.9223(7) keV
|
17.36(5) s
|
IT
|
77Se
|
7/2+
|
|
|
78Se
|
34
|
44
|
77.9173091(18)
|
穩定
|
0+
|
0.2377(28)
|
|
79 Se [n 6]
|
34
|
45
|
78.9184991(18)
|
3.27(8)×105 y
|
β−
|
79Br
|
7/2+
|
|
|
79mSe
|
95.77(3) keV
|
3.92(1) min
|
IT (99.944%)
|
79Se
|
1/2-
|
|
|
β− (.056%)
|
79Br
|
80 Se
|
34
|
46
|
79.9165213(21)
|
觀測上穩定[n 7]
|
0+
|
0.4961(41)
|
|
81Se
|
34
|
47
|
80.9179925(22)
|
18.45(12) min
|
β−
|
81Br
|
1/2-
|
|
|
81mSe
|
102.99(6) keV
|
57.28(2) min
|
IT (99.948%)
|
81Se
|
7/2+
|
|
|
β− (.052%)
|
81Br
|
82Se[n 8]
|
34
|
48
|
81.9166994(22)
|
0.97(5)×1020 y
|
β−β−
|
82Kr
|
0+
|
0.0873(22)
|
|
83Se
|
34
|
49
|
82.919118(4)
|
22.3(3) min
|
β−
|
83Br
|
9/2+
|
|
|
83mSe
|
228.50(20) keV
|
70.1(4) s
|
β−
|
83Br
|
1/2-
|
|
|
84Se
|
34
|
50
|
83.918462(16)
|
3.1(1) min
|
β−
|
84Br
|
0+
|
|
|
85Se
|
34
|
51
|
84.92225(3)
|
31.7(9) s
|
β−
|
85Br
|
(5/2+)#
|
|
|
86Se
|
34
|
52
|
85.924272(17)
|
15.3(9) s
|
β−
|
86Br
|
0+
|
|
|
87Se
|
34
|
53
|
86.92852(4)
|
5.50(12) s
|
β− (99.64%)
|
87Br
|
(5/2+)#
|
|
|
β−, n (.36%)
|
86Br
|
88Se
|
34
|
54
|
87.93142(5)
|
1.53(6) s
|
β− (99.01%)
|
88Br
|
0+
|
|
|
β−, n (.99%)
|
88Br
|
89Se
|
34
|
55
|
88.93645(32)#
|
0.41(4) s
|
β− (92.2%)
|
89Br
|
(5/2+)#
|
|
|
β−, n (7.8%)
|
88Br
|
90Se
|
34
|
56
|
89.93996(43)#
|
300# ms [>300 ns]
|
β−, n
|
89Br
|
0+
|
|
|
β−
|
90Br
|
91Se
|
34
|
57
|
90.94596(54)#
|
270(50) ms
|
β− (79%)
|
91Br
|
1/2+#
|
|
|
β−, n
|
90Br
|
92Se
|
34
|
58
|
91.94992(64)#
|
100# ms [>300 ns]
|
β−
|
92Br
|
0+
|
|
|
93Se
|
34
|
59
|
92.95629(86)#
|
50# ms [>300 ns]
|
|
|
1/2+#
|
|
|
94Se
|
34
|
60
|
93.96049(86)#
|
20# ms [>300 ns]
|
|
|
0+
|
|
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Close
畫上#號的數據代表沒有經過實驗的証明,僅為理論推測。
Believed to decay by β+β+ to 74Ge
Long-lived fission product
Believed to decay by β−β− to 80Kr
Azzolini, O.; Beeman, J. W.; Bellini, F.; Beretta, M.; Biassoni, M.; Brofferio, C.; Bucci, C.; Capelli, S.; et al. Measurement of the 2νββ Decay Half-Life of 82Se with the Global CUPID-0 Background Model. Physical Review Letters. 2023-11-29, 131 (22). ISSN 0031-9007. doi:10.1103/PhysRevLett.131.222501.
存档副本. [2015-09-13]. (原始內容存檔於2017-02-19).
- 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) (頁面存檔備份,存於網際網路檔案館). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005) (頁面存檔備份,存於網際網路檔案館).
- 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 (頁面存檔備份,存於網際網路檔案館), Nuc. Phys. A 729, pp. 3-128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (頁面存檔備份,存於網際網路檔案館) (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.