Actinide measurements by accelerator mass spectrometry at Lawrence Livermore National Laboratory
We report on the development of an accelerator mass spectrometry (AMS) system for the measurement of actinides at Lawrence Livermore National Laboratory. This AMS system is centered on a recently completed heavy isotope beam line that was designed particularly for high sensitivity, robust, high thro...
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Published in | Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Vol. 223-224; pp. 788 - 795 |
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Elsevier B.V
01.08.2004
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Abstract | We report on the development of an accelerator mass spectrometry (AMS) system for the measurement of actinides at Lawrence Livermore National Laboratory. This AMS system is centered on a recently completed heavy isotope beam line that was designed particularly for high sensitivity, robust, high throughput measurements of actinide concentrations and isotopic ratios. A fast-isotope switching capability has been incorporated in the system, allowing flexibility in isotope selection and for the quasi-continuous normalization to a reference isotope spike.
Initially, our utilization of the heavy isotope system has concentrated on the measurement of Pu isotopes. Under current operating conditions, background levels equivalent to ∼1×105 atoms are observed during routine 239Pu and 240Pu measurements. Measurements of samples containing ∼1013238U atoms demonstrate that the system provides a 238U rejection factor during 239Pu measurements of ∼107. Measurements of known materials, combined with results from an externally organized intercomparison program, indicate that our 239Pu measurements are accurate and precise down to the μBq level (∼106 atoms). Recently, we have investigated the performance of our heavy isotope AMS system in measurements of 237Np and 236U. Results of these investigations are discussed. The sensitivity shown by our Pu measurements, combined with the high throughput and interference rejection capabilities of our AMS system, demonstrate that AMS can provide a rapid and cost-effective measurement technique for actinides in a wide variety of studies. |
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AbstractList | We report on the development of an accelerator mass spectrometry (AMS) system for the measurement of actinides at Lawrence Livermore National Laboratory. This AMS system is centered on a recently completed heavy isotope beam line that was designed particularly for high sensitivity, robust, high throughput measurements of actinide concentrations and isotopic ratios. A fast-isotope switching capability has been incorporated in the system, allowing flexibility in isotope selection and for the quasi-continuous normalization to a reference isotope spike.
Initially, our utilization of the heavy isotope system has concentrated on the measurement of Pu isotopes. Under current operating conditions, background levels equivalent to ∼1×105 atoms are observed during routine 239Pu and 240Pu measurements. Measurements of samples containing ∼1013238U atoms demonstrate that the system provides a 238U rejection factor during 239Pu measurements of ∼107. Measurements of known materials, combined with results from an externally organized intercomparison program, indicate that our 239Pu measurements are accurate and precise down to the μBq level (∼106 atoms). Recently, we have investigated the performance of our heavy isotope AMS system in measurements of 237Np and 236U. Results of these investigations are discussed. The sensitivity shown by our Pu measurements, combined with the high throughput and interference rejection capabilities of our AMS system, demonstrate that AMS can provide a rapid and cost-effective measurement technique for actinides in a wide variety of studies. |
Author | Marchetti, A.A Hamilton, T.F Martinelli, R.E Cox, C.C Brown, T.A Knezovich, J.P |
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Cites_doi | 10.1039/b009764k 10.1016/0168-583X(94)96014-3 10.2172/15013600 10.1016/0168-583X(96)00287-X 10.1021/ac60259a007 10.2172/10136559 10.1016/S0168-583X(00)00091-4 10.1016/S0168-583X(96)00428-4 10.1016/S0168-583X(00)00345-1 10.1016/S1387-3806(02)00944-2 10.1016/j.nimb.2004.04.043 |
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Keywords | Trace detection Accelerator mass spectrometry (AMS) 41.75.Cn 32.10.Bi 29.17.+w 41.75.−i 07.75.+h 82.80.Ms 82.55.+e 29.30.Aj Actinide elements Plutonium bioassay Actinides Radiochemistry Plutonium |
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SubjectTerms | Accelerator mass spectrometry (AMS) Actinide elements Actinides Plutonium Plutonium bioassay Radiochemistry Trace detection |
Title | Actinide measurements by accelerator mass spectrometry at Lawrence Livermore National Laboratory |
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