It's Elemental - Isotopes of the Element Bromine

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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 Bromine with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

79	50.69%	Stable

81	49.31%	Stable

All Known Isotopes of the Element Bromine

Mass Number	Half-life	Decay Mode	Branching Percentage

67	No Data Available	Proton Emission	No Data Available

68	< 1.2 microseconds	Proton Emission	No Data Available

69	< 24 nanoseconds	Proton Emission	No Data Available

70	79.1 milliseconds	Electron Capture	No Data Available

70_m	2.2 seconds	Electron Capture	No Data Available

71	21.4 seconds	Electron Capture	100.00

72	78.6 seconds	Electron Capture	100.00

72_m	10.6 seconds	Isomeric Transition	~ 100.00

		Electron Capture	No Data Available

73	3.4 minutes	Electron Capture	100.00

74	25.4 minutes	Electron Capture	100.00

74_m	46 minutes	Electron Capture	100.00

75	96.7 minutes	Electron Capture	100.00

76	16.2 hours	Electron Capture	100.00

76_m	1.31 seconds	Isomeric Transition	> 99.40

		Electron Capture	< 0.60

77	57.036 hours	Electron Capture	100.00

77_m	4.28 minutes	Isomeric Transition	100.00

78	6.46 minutes	Electron Capture	>= 99.99

		Beta-minus Decay	<= 0.01

79	Stable	-	-

79_m	4.86 seconds	Isomeric Transition	100.00

80	17.68 minutes	Beta-minus Decay	91.70

		Electron Capture	8.30

80_m	4.4205 hours	Isomeric Transition	100.00

81	Stable	-	-

82	35.30 hours	Beta-minus Decay	100.00

82_m	6.13 minutes	Isomeric Transition	97.60

		Beta-minus Decay	2.40

83	2.40 hours	Beta-minus Decay	100.00

84	31.80 minutes	Beta-minus Decay	100.00

84_m	6.0 minutes	Beta-minus Decay	100.00

85	2.90 minutes	Beta-minus Decay	100.00

86	55.1 seconds	Beta-minus Decay	100.00

87	55.65 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	2.60

88	16.29 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	6.58

89	4.40 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	13.80

90	1.91 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	25.20

91	0.541 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	20.00

92	0.343 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	33.10

93	102 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	68.00

94	70 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	70.00

95	> 150 nanoseconds	Beta-minus Decay	No Data Available

96	> 150 nanoseconds	Beta-minus Decay	No Data Available

97	> 150 nanoseconds	Beta-minus Decay	No Data Available