Determination of stable isotope ratios using nuclear reaction analysis coupled with a particle–gamma coincidence method,Journal of Analytical Atomic Spectrometry

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Determination of stable isotope ratios using nuclear reaction analysis coupled with a particle–gamma coincidence method
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2020-11-09 , DOI: 10.1039/d0ja00283f
Paula Rangel Pestana Allegro _{1,

2,

3,

4} , Márcia de Almeida Rizzutto _{1,

2,

3,

4} , Nemitala Added _{1,

2,

3,

4} , Vitor Ângelo Paulino de Aguiar _{1,

2,

3,

4} , Dennis Lozano Toufen _{4,

5,

6} , Eduardo Luiz Augusto Macchione _{1,

2,

3,

4} , Nilberto Heder Medina _{1,

2,

3,

4} , Roberto Vicençotto Ribas _{1,

2,

3,

4} , José Roberto Brandão de Oliveira _{1,

2,

3,

4} , Rafael Escudeiro _{1,

2,

3,

4} , Juan Antonio Alcántara-Núñez _{1,

2,

3,

4} , Jessica Fleury Curado _{4,

7,

8,

9} , Valdir Brunetti Scarduelli _{1,

2,

3,

4} , Vinicius Antonio Bocaline Zagatto _{1,

2,

3,

4,

10} , Cléber Lima Rodrigues _{1,

2,

3,

4} , Manfredo Harri Tabacniks _{1,

2,

3,

4}

Affiliation

A non-destructive standard-free analytical method of obtaining stable isotope ratios in materials using nuclear reactions excited by an 11.75 MeV proton beam is demonstrated for a special ⁶³Cu/⁶⁵Cu target characterized traceably by Rutherford backscattering spectrometry (using 2.2 MeV protons). The method is general and is capable of being a useful alternative to standard ICP-MS methods. Relatively high energy proton beams are required to excite multiple isotopes of most elements of interest, and the many resulting nuclear reaction products are filtered by coincidence methods to characterize the desired isotope ratios. Specifically: the use of particle–gamma coincidences permits identification of specific channels populated in the nuclear reaction and avoids or minimizes typical drawbacks of this method including high backgrounds and interfering reactions. The test Cu target was a sandwich of a natural Cu and an enriched ⁶⁵Cu foil, and particle–gamma coincidences were measured for the reactions ⁶³Cu(p,πγ){⁶³Cu,⁶⁰Ni} and the corresponding reactions for ⁶⁵Cu (where “π” represents the energetic charged particle reaction product: proton or alpha). Limitations of the method, and applications in cultural heritage and other fields are discussed.

中文翻译：

使用核反应分析结合粒子-伽马符合方法确定稳定同位素比

对于特殊的⁶³ Cu / ^65，证明了一种无损无标分析方法，该方法利用11.75 MeV质子束激发的核反应获得材料中稳定的同位素比。铜靶材通过卢瑟福背散射光谱法（使用2.2 MeV质子）可追溯地表征。该方法是常规方法，可以作为标准ICP-MS方法的有用替代方法。需要相对较高能量的质子束来激发大多数目标元素的多种同位素，并且通过重合方法对许多所得核反应产物进行过滤，以表征所需的同位素比率。特别是：使用粒子-伽马巧合可以识别核反应中存在的特定通道，并避免或最小化此方法的典型缺点，包括高背景和干扰反应。测试的铜靶是天然铜和富集的⁶⁵铜箔的三明治，并测量了反应的颗粒-伽马重合度⁶³ Cu（p，πγ）{⁶³ Cu，⁶⁰ Ni}和⁶⁵ Cu的相应反应（其中“π”代表高能带电粒子反应产物：质子或α）。讨论了该方法的局限性以及在文化遗产和其他领域中的应用。

更新日期：2020-11-27

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