X-Ray Emission Analysis of High Atomic Number Elements: A New Excitation Source Using Monoenergic 477 keV γ-Rays from the ¹⁰B(n, α) ^7mLi → ⁷Li Reaction

Authors: Kowalski, B.R.; Isenhour, T.L.

Source: Applied Spectroscopy, Volume 23, Issue 1, Pages 1-73 (January/February 1969) , pp. 1-4(4)

Publisher: Society for Applied Spectroscopy

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Abstract:

A new excitation source has been developed for x-ray emission analysis of high atomic number elements. A mixture of the sample and a small amount of boron-10 is irradiated in a thermal neutron beam and the resultant × radiation is recorded using a Ge(Li) semiconductor detector and a multichannel analyzer. The boron-10 undergoes neutron capture (¹⁰B(n,α)⁷Li, σ=3840b) producing a single excited state of lithium-7 in 92.5% of the captures. Lithium-7m decays with a half-life of about 5x10⁻¹⁴ sec emitting a monoenergic 477 keV gamma ray. These gamma rays are in excellent geometry to the sample and are sufficiently energetic to excite the K × radiation of the highest atomic number elements known. The K x-ray spectra of several elements are presented along with a discussion of sample preparation and apparatus optimization.

Document Type: Research article

DOI: http://dx.doi.org/10.1366/000370269774381274

Affiliations: 1: Department of Chemistry, University of Washington, Seattle, Washington 98105

Publication date: 1969-01-01

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