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The Periodic Table of Elements

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Isotopes of the Element Einsteinium
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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.

All Known Isotopes of the Element Einsteinium

Mass Number		Half-life		Decay Mode		Branching Percentage

241		8 seconds		Alpha Decay		No Data Available

242		13.5 seconds		Alpha Decay		> 0.00

				Electron Capture		> 0.00

243		19 seconds		Electron Capture		<= 70.00

				Alpha Decay		>= 30.00

244		37 seconds		Electron Capture		96.00

				Alpha Decay		4.00

245		1.1 minutes		Electron Capture		60.00

				Alpha Decay		40.00

246		7.7 minutes		Electron Capture		90.10

				Alpha Decay		9.90

				Electron Capture		3.0E-3

247		4.55 minutes		Electron Capture		~ 93.00

				Alpha Decay		~ 7.00

248		27 minutes		Electron Capture		99.70

				Alpha Decay		~ 0.25

249		102.2 minutes		Electron Capture		99.43

				Alpha Decay		0.57

250		8.6 hours		Electron Capture		> 97.00

				Alpha Decay		< 3.00

250_m		2.22 hours		Electron Capture		<= 100.00

251		33 hours		Electron Capture		99.50

				Alpha Decay		0.50

252		471.7 days		Alpha Decay		78.00

				Electron Capture		22.00

				Beta-minus Decay		~ 0.01

253		20.47 days		Alpha Decay		100.00

				Spontaneous Fission		8.7E-6

254		275.7 days		Alpha Decay		~ 100.00

				Beta-minus Decay		1.7E-4

				Spontaneous Fission		< 3.0E-6

				Electron Capture		No Data Available

254_m		39.3 hours		Beta-minus Decay		98.00

				Isomeric Transition		< 3.00

				Alpha Decay		0.32

				Electron Capture		0.08

				Spontaneous Fission		< 0.05

255		39.8 days		Beta-minus Decay		92.00

				Alpha Decay		8.00

				Spontaneous Fission		4.1E-3

256		25.4 minutes		Beta-minus Decay		100.00

256_m		7.6 hours		Beta-minus Decay		100.00

257		7.7 days		Beta-minus Decay		No Data Available

				Spontaneous Fission		No Data Available

This page is maintained by Steve Gagnon.

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