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Analysis of soil reference material using two neutron activation methods

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5th International k0-Users Workshop

Belo Horizonte, Minas Gerais, Brazil, 13 – 17 September 2009

Analysis of soil reference material using two neutron activation methods

S. Metairon

1

, L. Kovacs

1

, C.B. Zamboni

1

, M.Â.B.C. Menezes

2

1 Instituto de Pesquisas Energéticas e Nucleares - IPEN/CNEN-SP, Brazil [email protected]

2 Centro de Desenvolvimento da Tecnologia Nuclear - CDTN/CNEN, Brazil [email protected]

The concentration of the elements in the soil reference material (IAEA /SOIL-7) was obtained after been analyzed at IPEN/SP using nuclear data and neutron flux parameters. The Cd Ratio Technique was used for the measurement of thermal neutron flux distribution in the IEA-R1 nuclear reactor. The concentration of each element was then obtained by using an in- house software, which correlated the measured parameters, i. e., neutron flux, net area and efficiency of the selected gamma ray with the constants physics involved (the decay constant;

the atomic mass, the Avogadro's number, the cross section for the selected capture reaction, the isotopic fraction and the intensity of the gamma ray). In a running of this software the user needs to input data about irradiation time, counting time and waiting time (the time elapsed between the end of the irradiation and the start of the counting) and the sample mass.

The performance of this procedure is compared to results obtained in the same

reference material using the k

0

-standardization method, applying the commercial KayWin

software package. This k

0

-standardization method was applied at CDTN/CNEN, Belo

Horizonte, using the TRIGA MARK I IPR-R1 nuclear reactor. The advantages and

disadvantages of each method and sources of errors are discussed.

Referências

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