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Isotopes of Selenium (Z=34)
Click on an isotope to get more information about its decay
Isotope	Half-life	Spin Parity	Decay Mode(s) or Abundance
⁶⁵Se			%EC+%B+=100, %ECP=?
⁶⁶Se		0+	%EC+%B+=100
⁶⁷Se	60 ms		%EC+%B+=100, %ECP=0.5 1
⁶⁸Se	35.5 s	0+	%EC+%B+=100
⁶⁹Se	27.4 s	(3/2-)	%EC+%B+=100, %ECP=0.045 10
⁷⁰Se	41.1 m	0+	%EC+%B+=100
⁷¹Se	4.74 m	3/2-,5/2-	%EC+%B+=100
⁷²Se	8.40 d	0+	%EC=100
⁷³Se	7.15 h	9/2+	%EC+%B+=100
^73m1Se	39.8 m	3/2-	%EC+%B+=27.4 3, %IT=72.6 3
⁷⁴Se	stable	0+	%Abundance=0.89 2
⁷⁵Se	119.779 d	5/2+	%EC=100
⁷⁶Se	stable	0+	%Abundance=9.36 11
⁷⁷Se	stable	1/2-	%Abundance=7.63 6
^77m1Se	17.36 s	7/2+	%IT=100
⁷⁸Se	stable	0+	%Abundance=23.78 9
⁷⁹Se	1.13e6 y	7/2+	%B-=100
^79m1Se	3.92 m	1/2-	%IT=99.944 11, %B-=0.056 11
⁸⁰Se	stable	0+	%Abundance=49.61 10
⁸¹Se	18.45 m	1/2-	%B-=100
^81m1Se	57.28 m	7/2+	%IT=99.948 14, %B-=0.052 14
⁸²Se	1.08e+20 y	0+	%Abundance=8.73 6, %BB=100
⁸³Se	22.3 m	9/2+	%B-=100
^83m1Se	70.1 s	1/2-	%B-=100
⁸⁴Se	3.10 m	0+	%B-=100
⁸⁵Se	31.7 s	(5/2+)	%B-=100
⁸⁶Se	15.3 s	0+	%B-=100
⁸⁷Se	5.29 s	(5/2+)	%B-=100, %B-N=0.36 8
⁸⁸Se	1.53 s	0+	%B-=100, %B-N=0.99 10
⁸⁹Se	0.41 s	(5/2+)	%B-=100, %B-N=7.8 25
⁹⁰Se		0+
⁹¹Se	0.27 s		%B-=100, %B-N=21 10
⁹²Se		0+	%B-=?
⁹³Se		(1/2+)	%B-=?
⁹⁴Se		0+	%B-=?

Isotopes of Selenium (Z=34)