Precise determination of HPGe detector efficiency for gamma spectrometry measurements of environmental samples with variable geometry and density

• Autorzy: Barrera M. , Casas-Ruiz M. , Alonso J. J. , Vidal J.

Identyfikatory

DOI

10.1515/nuka-2017-0007

• Języki publikacji: EN

Abstrakty

EN

A methodology to determine the full energy peak efficiency (FEPE) for precise gamma spectrometry measurements of environmental samples with high-purity germanium (HPGe) detector, valid when this efficiency depends on the energy of the radiation E, the height of the cylindrical sample H, and its density ρ is introduced. The methodology consists of an initial calibration as a function of E and H and the application of a self-attenuation factor, depending on the density of the sample ρ, in order to correct for the different attenuation of the generic sample in relation to the measured standard. The obtained efficiency can be used in the whole range of interest studied, E = 120–2000 keV, H = 1–5 cm, and ρ = 0.8–1.7 g/cm3, being its uncertainty below 5%. The efficiency has been checked by the measurement of standards, resulting in a good agreement between experimental and expected activities. The described methodology can be extended to similar situations when samples show geometric and compaction differences.

Słowa kluczowe

EN

efficiency calibration; environmental radioactivity; gamma spectrometry; geometric dependence of the efficiency; self-attenuation corrections

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2017
• Tom: Vol. 62, No. 1
• Strony: 47--59
• Opis fizyczny: Bibliogr. 17 poz., rys.

Twórcy

autor

Barrera M.

• Group of Environmental Radioactivity, Applied Physics Department, CEIMAR, University of Cadiz, Avda. Rep. Saharaui s/n, Puerto Real 11510, Cádiz, Spain, Tel.: [phone], Fax: [phone]

autor

Casas-Ruiz M.

• Group of Environmental Radioactivity, Applied Physics Department, CEIMAR, University of Cadiz, Avda. Rep. Saharaui s/n, Puerto Real 11510, Cádiz, Spain, Tel.: [phone], Fax: [phone]

autor

Alonso J. J.

• Group of Environmental Radioactivity, Applied Physics Department, CEIMAR, University of Cadiz, Avda. Rep. Saharaui s/n, Puerto Real 11510, Cádiz, Spain, Tel.: [phone], Fax: [phone]

autor

Vidal J.

• Group of Environmental Radioactivity, Applied Physics Department, CEIMAR, University of Cadiz, Avda. Rep. Saharaui s/n, Puerto Real 11510, Cádiz, Spain, Tel.: [phone], Fax: [phone]

Bibliografia

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Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).