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Studies in heavy ion activation analysis

III. Low energy14N activation for determination of lithium and beryllium

Journal of Radioanalytical and Nuclear Chemistry
Authors: B. Lass, C. Friedli, and E. Schweikert

Abstract  

A procedure for measuring trace amounts of Li and Be in different types of samples has been studied using a 12.5 MeV14N beam. At this energy the principal nuclear reactions are6Li(14N, d)18F,7Li(14N, t)18F, and9Be(14N, αn)18F. Detection limit for destructive analysis for either beryllium or lithium has been calculated at 300 ppb with a determination limit of 5 ppm for an irradiation with a beam of 1 μA·h/cm2. Destructive analysis was performed on CANMET SY-2 and USGS BCR-1 (rock samples 1–10 ppm Be). Non-destructive analysis for beryllium and lithium was performed on NBS SRM 610 (500 ppm trace element glass), NBS 612 (50 ppm trace element glass), and NBS SRM 181 (Spodumene ore, 6.4% Li2O). Detection limit of 2 ppm has been calculated for nondestructive analysis of either lithium or beryllium.

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Studies in heavy ion activation analysis

II. Trace determination possibilities with18O ion bombardment

Journal of Radioanalytical and Nuclear Chemistry
Authors: C. Friedli, B. Lass, and E. Schweikert

Abstract  

18O induced radioactivation may be used for the trace detection of1H via1H (18O, n)18F. Matrices in which this reaction is interference-free include: Al, Si, S, K, Ti, V, Ni, Cu and Zn. However, due to numerous radioisotopes created at the bombarding energies used (E≥51 MeV), a post-irradiation chemical separation of18F is required.18O activation also appears as a promising means for the trace determination of S[S(18O, x)47V], Si[Si(18O, x)43–44Sc] and B[B(18O, x)37Mg].

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Studies in heavy ion activation analysis

IV.6Li induced reactions for chemical analysis

Journal of Radioanalytical and Nuclear Chemistry
Authors: B. Lass, J. Ojo, and E. Schweikert

Abstract  

The use of 7 MeV6Li+ for heavy ion activation analysis was investigated. A survey of reactions, involving targets of lithium through oxygen inclusive, were studied for production of β+ radioactivation products with half-lives of 101−105 seconds. Specific activities for all reactions under the experimental conditions are reported and their use for analysis is assessed.

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Studies in heavy ion activation analysis

V. Determination of carbon in steel by6Li activation

Journal of Radioanalytical and Nuclear Chemistry
Authors: J. Ojo, B. Lass, and E. Schweikert

Abstract  

Nondestructive heavy ion activation analysis has been used to determine the carbon content in various NBS SRM steel samples with a 7.0MeV6Li+ beam. The reaction12C(6Li, αn)13N allows for carbon analysis with the only possible interference being beryllium,9Be(6Li, 2n)13N. Under interference-free conditions, and employing a post-irradiation etch, the detection limit for carbon analysis in steel was 5 ppm.

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