It's Elemental - Isotopes of the Element Protactinium

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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 Protactinium

Mass Number		Half-life		Decay Mode		Branching Percentage

212		5.1 milliseconds		Alpha Decay		No Data Available

213		5.3 milliseconds		Alpha Decay		100.00

214		17 milliseconds		Alpha Decay		100.00

215		14 milliseconds		Alpha Decay		100.00

216		105 milliseconds		Alpha Decay		~ 98.00

				Electron Capture		~ 2.00

217		2.3 milliseconds		Alpha Decay		100.00

217_m		1.5 milliseconds		Alpha Decay		100.00

218		0.11 milliseconds		Alpha Decay		100.00

219		53 nanoseconds		Alpha Decay		100.00

221		4.9 microseconds		Alpha Decay		100.00

222		3.3 milliseconds		Alpha Decay		100.00

223		5.1 milliseconds		Alpha Decay		100.00

224		0.85 seconds		Alpha Decay		100.00

225		1.7 seconds		Alpha Decay		100.00

226		1.8 minutes		Alpha Decay		74.00

				Electron Capture		26.00

227		38.3 minutes		Alpha Decay		85.00

				Electron Capture		15.00

228		22 hours		Electron Capture		98.00

				Alpha Decay		2.00

229		1.50 days		Electron Capture		99.52

				Alpha Decay		0.48

230		17.4 days		Electron Capture		91.60

				Beta-minus Decay		8.40

				Alpha Decay		3.2E-3

231		3.276×10⁺⁴ years		Alpha Decay		100.00

				Spontaneous Fission		<= 3E-10

232		1.31 days		Beta-minus Decay		100.00

				Electron Capture		3.0E-3

233		26.967 days		Beta-minus Decay		100.00

234		6.70 hours		Beta-minus Decay		100.00

234_m		1.17 minutes		Beta-minus Decay		99.84

				Isomeric Transition		0.16

235		24.5 minutes		Beta-minus Decay		100.00

236		9.1 minutes		Beta-minus Decay		100.00

237		8.7 minutes		Beta-minus Decay		100.00

238		2.3 minutes		Beta-minus Decay		100.00

				Spontaneous Fission		< 2.6E-6

239		106 minutes		Beta-minus Decay		100.00

240		≈ 2 minutes		Beta-minus Decay		No Data Available

This page is maintained by Steve Gagnon.

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