硒的同位素

**主要的硒同位素**
標準原子質量（英语：Standard atomic weight） (Ar, 標準)	78.971(8);
←As（33）	Br（35）→
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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。

圖表编辑

符號	Z（ p ）	N（ n ）	同位素質量（u）	半衰期^{[n 1]}	衰變方式^[3]	衰變產物^{[n 2]}	原子核自旋	相對豐度（莫耳分率）	相對豐度的變化量（莫耳分率）
符號	激發能量			半衰期^{[n 1]}	衰變方式^[3]	衰變產物^{[n 2]}	原子核自旋	相對豐度（莫耳分率）	相對豐度的變化量（莫耳分率）
⁶⁵Se	34	31	64.96466(64)#	<50 ms	β⁺ (>99.9%)	⁶⁵As	3/2-#
⁶⁵Se	34	31	64.96466(64)#	<50 ms	β⁺, p (<.1%)	⁶⁴Ge	3/2-#
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-#
⁶⁷Se	34	33	66.95009(21)#	133(11) ms	β⁺, p (.5%)	⁶⁶Ge	5/2-#
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-)
⁶⁹Se	34	35	68.93956(4)	27.4(2) s	β⁺, p (.045%)	⁶⁸Ge	(1/2-)
^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-
^73mSe	25.71(4) keV			39.8(13) min	β⁺	⁷³As	3/2-
⁷⁴Se	34	40	73.9224764(18)	觀測上穩定 ^{[n 3]}			0+	0.0089(4)
⁷⁵Se	34	41	74.9225234(18)	119.779(4) d	ε	⁷⁵As	5/2+
⁷⁶Se	34	42	75.9192136(18)	稳定			0+	0.0937(29)
⁷⁷Se	34	43	76.9199140(18)	稳定			1/2-	0.0763(16)
^77mSe	161.9223(7) keV			17.36(5) s	IT	⁷⁷Se	7/2+
⁷⁸Se	34	44	77.9173091(18)	稳定			0+	0.2377(28)
79 Se （英语：Selenium-79）^{[n 4]}	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-
^79mSe	95.77(3) keV			3.92(1) min	β⁻ (.056%)	⁷⁹Br	1/2-
80 Se	34	46	79.9165213(21)	觀測上穩定^{[n 5]}			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+
^81mSe	102.99(6) keV			57.28(2) min	β⁻ (.052%)	⁸¹Br	7/2+
⁸²Se^{[n 6]}	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+)#
⁸⁷Se	34	53	86.92852(4)	5.50(12) s	β⁻, n (.36%)	⁸⁶Br	(5/2+)#
⁸⁸Se	34	54	87.93142(5)	1.53(6) s	β⁻ (99.01%)	⁸⁸Br	0+
⁸⁸Se	34	54	87.93142(5)	1.53(6) s	β⁻, n (.99%)	⁸⁸Br	0+
⁸⁹Se	34	55	88.93645(32)#	0.41(4) s	β⁻ (92.2%)	⁸⁹Br	(5/2+)#
⁸⁹Se	34	55	88.93645(32)#	0.41(4) s	β⁻, n (7.8%)	⁸⁸Br	(5/2+)#
⁹⁰Se	34	56	89.93996(43)#	300# ms [>300 ns]	β⁻, n	⁸⁹Br	0+
⁹⁰Se	34	56	89.93996(43)#	300# ms [>300 ns]	β⁻	⁹⁰Br	0+
⁹¹Se	34	57	90.94596(54)#	270(50) ms	β⁻ (79%)	⁹¹Br	1/2+#
⁹¹Se	34	57	90.94596(54)#	270(50) ms	β⁻, n	⁹⁰Br	1/2+#
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+

備註：畫上#號的數據代表沒有經過實驗的証明，只是理論推測而已，而用括號括起來的代表數據不確定性。

←	同位素列表	→
砷的同位素	硒的同位素	溴的同位素

註釋编辑

^ Bold for isotopes with half-lives longer than the age of the universe (nearly stable)
^ Bold for stable isotopes
^ Believed to decay by β⁺β⁺ to ⁷⁴Ge
^ Long-lived fission product
^ Believed to decay by β⁻β⁻ to ⁸⁰Kr
^ Primordial radionuclide

参考文獻编辑

^ 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.
^ Meija, Juris; et al. Atomic weights of the elements 2013 (IUPAC Technical Report). Pure and Applied Chemistry. 2016, 88 (3): 265–91. doi:10.1515/pac-2015-0305.
^ 存档副本. [2015-09-13]. （原始内容存档于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) （页面存档备份，存于互联网档案馆）. Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005) （页面存档备份，存于互联网档案馆）.
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 （页面存档备份，存于互联网档案馆）, Nuc. Phys. A 729, pp. 3-128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database （页面存档备份，存于互联网档案馆） (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.

[3] Bold for isotopes with half-lives longer than the age of the universe (nearly stable)

[5] Bold for stable isotopes

[6] Believed to decay by β⁺β⁺ to ⁷⁴Ge

[7] Long-lived fission product

[8] Believed to decay by β⁻β⁻ to ⁸⁰Kr

[9] Primordial radionuclide

[1] 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.

[CIAAW2013-2] Meija, Juris; et al. Atomic weights of the elements 2013 (IUPAC Technical Report). Pure and Applied Chemistry. 2016, 88 (3): 265–91. doi:10.1515/pac-2015-0305.

[4] 存档副本. [2015-09-13]. （原始内容存档于2017-02-19）.

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