Sum-peak method with two NaI(Tl) crystals: 68(Ge+Ga) standardization

Estela Maria Oliveira; Akira Iwahara; Roberto Poledna; Carlos José da Silva; Paulo Alberto Lima da Cruz; Regio dos Santos Gomes; José Ubiratan Delgado; Ricardo Tadeu Lopes

doi:10.15392/bjrs.v7i3B.862

Sum-peak method with two NaI(Tl) crystals: 68(Ge+Ga) standardization

Authors

Estela Maria Oliveira Instituto de Radioproteção e Dosimetria
Akira Iwahara Instituto de Radioproteção e Dosimetria
Roberto Poledna Instituto de Radioproteção e Dosimetria
Carlos José da Silva Instituto de Radioproteção e Dosimetria
Paulo Alberto Lima da Cruz Instituto de Radioproteção e Dosimetria
Regio dos Santos Gomes
José Ubiratan Delgado Instituto de Radioproteção e Dosimetria
Ricardo Tadeu Lopes UFRJ/COPPE/PEN

DOI:

https://doi.org/10.15392/bjrs.v7i3B.862

Keywords:

68Ge, 68Ga, sum-peak method, activity standardization, anticoincidence method

Abstract

A ⁶⁸(Ge+Ga) commercial solution has been standardized in LNMRI in Brazil, by sum-peak method, in which a 3”x3” NaI(Tl) gamma-ray detector is positioned at the top of a well-type 5”x5” NaI(Tl) gamma-ray detector, resulting in a set up approximately 4p geometry. In this work the known germanium volatility was tested using three dried sources and three liquid sources in the sum-peak method measurements and the activity results showed a standard deviation of 0.41%. The activities were compared with another primary method: 4pb-g live-timed anti-coincidence counting. The two methods gave activity concentration values with differences from the certified value of +0.8 % (anticoincidence method) and -3.4% (sum-peak method).

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References

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Published

2019-10-24

Issue

Vol. 7 No. 3B (Suppl.) (2019)

Section

Congresso Brasileiro de Metrologia das Radiações Ionizantes - CBMRI 2018

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How to Cite

Sum-peak method with two NaI(Tl) crystals: 68(Ge+Ga) standardization. Brazilian Journal of Radiation Sciences, Rio de Janeiro, Brazil, v. 7, n. 3B (Suppl.), 2019. DOI: 10.15392/bjrs.v7i3B.862. Disponível em: https://bjrs.org.br/revista/index.php/REVISTA/article/view/862. Acesso em: 22 dec. 2024.