Source self-attenuation in ionization chamber measurements of 57Co solutions

Cessna, Jeffrey T.; Golas, Daniel B.; Bergeron, Denis E.

doi:10.1016/j.apradiso.2015.12.019

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…This observation is in coherence with the increase of the source self-attenuation as long as the increase of density of the solution increases (see equation ( 1)). This effect has already been experimentally studied by A Rytz in 1978 for the 241 Am emitting 60 keV γrays [24] and by Cessna et al in 2016 for the 57 Co mainly emitting 122 keV γ-rays in a NIST ionization chamber [25]. Thus, the lack of robustness of the ionization chambers and thus of the SIR for radionuclides that emit only low-energy x-rays or gamma rays is confirmed by the present study.…”

Section: Influence Of the Properties Of The Solutionssupporting

confidence: 85%

Evaluation of long-term robustness of the International System of Reference (SIR) used in radionuclide metrology based on the meta-analysis of its machine-readable database

Coulon,

Michotte,

Gressier

2023

Metrologia

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In support of the CIPM MRA, the reference system in radionuclide metrology (SIR) is a unique experimental facility that has been able to provide continuous key comparison results for 72 radionuclides for 46 years. These measurement data are now available in a machine-readable format, which allows statistical analysis of these measurement results to be performed efficiently. Such a meta-analysis was conducted to verify whether or not the accumulated data confirmed the bold assumption made in the 1970s of the long-term robustness of the system over decades of operation. It was notably assumed that variation in the properties of the standard solution to be measured or the choice of the 226Ra reference source would have no impact on the measurement. For the majority of radionuclides measured by the SIR, the non-parametric significance tests of the null hypothesis carried out in this study gave no evidence, at the 95% confidence level, that the above statement should be reconsidered. However, this meta-analysis revealed a significant impact of solution density in the case of 109Cd, corroborating previous observations made in the case of 241Am where the robustness of an ionization chamber with respect to the density variation of the solution does not appear to be perfect. The extension of the SIR by a liquid scintillation system is under development. It will improve the robustness of international comparison results for those borderline cases where radionuclides emit only low-energy x-rays or gamma rays (<100 keV).

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Section: Influence Of the Properties Of The Solutionssupporting

confidence: 85%

Evaluation of long-term robustness of the International System of Reference (SIR) used in radionuclide metrology based on the meta-analysis of its machine-readable database

Coulon,

Michotte,

Gressier

2023

Metrologia

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“…Many researchers investigated the effect of SACF to calculate accurate activity concentration of the samples using gamma-ray spectrometry. [8,21,23,29,[30][31][32][33]. The peak count ratio for given energy in a gamma-ray spectrum can easily be used to calculate the intensity of gamma rays at that energy.…”

Section: Introductionmentioning

confidence: 99%

Determination of Self-absorption Correction Factors of Some Algae Samples: An Experimental study

ÖZKARA>¹,

Eke²

2023

Türk Doğa Ve Fen Dergisi

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The purpose of this study to examine experimentally self-absorption correction factors (SACFs) of some algae samples using gamma-ray spectrometry. Various algae samples were collected from Boğaçay in Antalya, Turkey. Collected algae samples were dried, and masses of the samples were calculated. Then densities of the samples were calculated. Each of algaes was counted with and without point sources which are 22Na, 60Co, 133Ba, and 137Cs about 1000 seconds using high purity germanium detector. The SACFs of algae samples were calculated between 80 keV and 1332 keV gamma-ray energies. As a result, SACFs of studied algae samples generally reduce as gamma-ray energy enhances. SACFs of some algae samples are nearly steady because of the densities and elemental contents of the studied algaes.

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Source self-attenuation in ionization chamber measurements of 57Co solutions

Cited by 2 publications

References 3 publications

Evaluation of long-term robustness of the International System of Reference (SIR) used in radionuclide metrology based on the meta-analysis of its machine-readable database

Evaluation of long-term robustness of the International System of Reference (SIR) used in radionuclide metrology based on the meta-analysis of its machine-readable database

Determination of Self-absorption Correction Factors of Some Algae Samples: An Experimental study

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