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1 - paducah environmental information center

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Annual Site Environmental Report for 1999<br />

Appendix B: Radi:onuclide and<br />

Chem!ical,N,omencl'ature<br />

Table B.1 Nomenclature and Half-Life for Radlonuclldes<br />

RadionucUde Symbol Half-Ufe Radionuclide Symbol<br />

Americium-241 wArn 432 years Potassium-40 4°K<br />

Bismuth-210 >loBi 5.01 days Protactinium-234m 2J4mpa<br />

Cesium-l37 mCs 30.2 years Radium-226 "oRa<br />

Half-Ufe<br />

1,260,000,000 years<br />

1. 17 minutes<br />

1,602 years<br />

CobaJt-60<br />

6OCO 5.3 years Radon-222 mRa<br />

3.821 days<br />

Lead~206<br />

200 Pb Stable Technetium-99 99Tc<br />

Lead-210 210 P b 21 years Thorium-230 21"Th<br />

Lead-214 "'Pb 26.8 minutes Thorium-23I 2J'Th<br />

Neptunium-237 2J1Np 2,140,000 years Thorium-234 214Th<br />

Plutonium-239 2J9pu 24, II 0 years Uranium-234 2HU<br />

212,000 years<br />

80,000 years<br />

25.5 hours<br />

24.1 days<br />

247;000 years<br />

Polonium-210 >l°po 138.9 days Uranium-235<br />

215 U<br />

710,000,000 years<br />

Polonium-214 2"PO 164 microseconds Uranium-236<br />

Polonium-218 21Bpo 3.05 minutes Uranium-238 218U<br />

2JO U<br />

23,900,000 years<br />

4,510,000,000 years·<br />

Appendix B<br />

B-1

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