It's Elemental - Isotopes of the Element Krypton

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Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.

Isotopes of the Element Krypton with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

78	0.35%	≥ 0.9×10⁺²⁰ years

80	2.28%	Stable

82	11.58%	Stable

83	11.49%	Stable

84	57.00%	Stable

86	17.30%	Stable

All Known Isotopes of the Element Krypton

Mass Number	Half-life	Decay Mode	Branching Percentage

69	32 milliseconds	Electron Capture	100.00

70	> 1.2 microseconds	Electron Capture	No Data Available

71	100 milliseconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	5.20

72	17.2 seconds	Electron Capture	100.00

73	27.3 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	0.25

73_m	107 nanoseconds	Isomeric Transition	100.00

74	11.50 minutes	Electron Capture	100.00

75	4.29 minutes	Electron Capture	100.00

76	14.8 hours	Electron Capture	100.00

77	74.4 minutes	Electron Capture	100.00

78	≥ 0.9×10⁺²⁰ years	Double Electron Capture	No Data Available

79	35.04 hours	Electron Capture	100.00

79_m	50 seconds	Isomeric Transition	100.00

80	Stable	-	-

81	2.29×10⁺⁵ years	Electron Capture	100.00

81_m	13.10 seconds	Isomeric Transition	100.00

		Electron Capture	2.5E-3

82	Stable	-	-

83	Stable	-	-

83_m	1.83 hours	Isomeric Transition	100.00

84	Stable	-	-

85	3934.4 days	Beta-minus Decay	100.00

85_m	4.480 hours	Beta-minus Decay	78.60

		Isomeric Transition	21.40

86	Stable	-	-

87	76.3 minutes	Beta-minus Decay	100.00

88	2.84 hours	Beta-minus Decay	100.00

89	3.15 minutes	Beta-minus Decay	100.00

90	32.32 seconds	Beta-minus Decay	100.00

91	8.57 seconds	Beta-minus Decay	100.00

92	1.840 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	0.03

93	1.286 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	1.95

94	0.33 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	5.70

95	0.78 seconds	Beta-minus Decay	100.00

96	> 50 milliseconds	Beta-minus Decay	No Data Available

97	> 150 nanoseconds	Beta-minus Decay	No Data Available

98	No Data Available	No Data Available	No Data Available

99	> 150 nanoseconds	Beta-minus Decay	No Data Available

100	> 150 nanoseconds	Beta-minus Decay	No Data Available