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Radionuclide Analysis – Quantification and<br />
Isotope Ratio Measurement<br />
Very high sensitivity and low<br />
background g for 10ppt U in 1:10<br />
diluted urine<br />
~1.2 million cps/ppb U<br />
Natural U spike, so 235 U (0.72%<br />
abundance) concentration was<br />
72ppq<br />
<strong>ICP</strong>-<strong>MS</strong> also provides isotopic<br />
information, so U isotopic pattern<br />
(isotope ratio) can be used to identify<br />
source of contamination<br />
N t l 0 72% 235 • Natural = 0.72% U 235U • Waste depleted = 0.2 - 0.4% 235U • Pile depleted 0 6% 235 • Pile depleted ~0.6% U 235U • Enriched >0.72% 235U Page 17<br />
2.0E4<br />
1.0E4<br />
[1] Spectrum No.1 [ 115.786 sec]:10Urine.d / Tune #1 [CPS] [Linear]<br />
238U (99.27%) ( )<br />
235 U (0.72%)<br />
m/z-> 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242<br />
U<br />
ESAC April 2008
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