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Purification and activity standardisation of a 166mHo solution

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Title: Purification and activity standardisation of a 166mHo solution
Authors: Nedjadi, Youcef1, Spring, Philippe1, Bailat, Claude claude.bailat@chuv.ch, Froidevaux, P.1, Wastiel, C.1, Bochud, François1
Source: Applied Radiation & Isotopes. Jun2008, Vol. 66 Issue 6/7, p900-904. 5p.
Subjects: Chromatographic analysis, Nuclear counters, Analytical chemistry, Phase partition
Abstract: Abstract: As part of a project to use the long-lived (T 1/2=1200a) 166mHo as reference source in its reference ionisation chamber, IRA standardised a commercially acquired solution of this nuclide using the 4πβ–γ coincidence and 4πγ (NaI) methods. The 166mHo solution supplied by Isotope Product Laboratories was measured to have about 5% Europium impurities (3% 154Eu, 0.94% 152Eu and 0.9% 155Eu). Holmium had therefore to be separated from europium, and this was carried out by means of ion-exchange chromatography. The holmium fractions were collected without europium contamination: 162h long HPGe gamma measurements indicated no europium impurity (detection limits of 0.01% for 152Eu and 154Eu, and 0.03% for 155Eu). The primary measurement of the purified 166mHo solution with the 4π (PC) β–γ coincidence technique was carried out at three gamma energy settings: a window around the 184.4keV peak and gamma thresholds at 121.8 and 637.3keV. The results show very good self-consistency, and the activity concentration of the solution was evaluated to be 45.640±0.098kBq/g (0.21% with k=1). The activity concentration of this solution was also measured by integral counting with a well-type 5″×5″ NaI(Tl) detector and efficiencies computed by Monte Carlo simulations using the GEANT code. These measurements were mutually consistent, while the resulting weighted average of the 4π NaI(Tl) method was found to agree within 0.15% with the result of the 4πβ–γ coincidence technique. An ampoule of this solution and the measured value of the concentration were submitted to the BIPM as a contribution to the Système International de Référence. [Copyright &y& Elsevier]
Copyright of Applied Radiation & Isotopes is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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  Data: Purification and activity standardisation of a <superscript>166m</superscript>Ho solution
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  Data: <searchLink fieldCode="AR" term="%22Nedjadi%2C+Youcef%22">Nedjadi, Youcef</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Spring%2C+Philippe%22">Spring, Philippe</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Bailat%2C+Claude%22">Bailat, Claude</searchLink><i> claude.bailat@chuv.ch</i><br /><searchLink fieldCode="AR" term="%22Froidevaux%2C+P%2E%22">Froidevaux, P.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wastiel%2C+C%2E%22">Wastiel, C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Bochud%2C+François%22">Bochud, François</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Radiation+%26+Isotopes%22">Applied Radiation & Isotopes</searchLink>. Jun2008, Vol. 66 Issue 6/7, p900-904. 5p.
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  Data: <searchLink fieldCode="DE" term="%22Chromatographic+analysis%22">Chromatographic analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+counters%22">Nuclear counters</searchLink><br /><searchLink fieldCode="DE" term="%22Analytical+chemistry%22">Analytical chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+partition%22">Phase partition</searchLink>
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  Data: Abstract: As part of a project to use the long-lived (T 1/2=1200a) 166mHo as reference source in its reference ionisation chamber, IRA standardised a commercially acquired solution of this nuclide using the 4πβ–γ coincidence and 4πγ (NaI) methods. The 166mHo solution supplied by Isotope Product Laboratories was measured to have about 5% Europium impurities (3% 154Eu, 0.94% 152Eu and 0.9% 155Eu). Holmium had therefore to be separated from europium, and this was carried out by means of ion-exchange chromatography. The holmium fractions were collected without europium contamination: 162h long HPGe gamma measurements indicated no europium impurity (detection limits of 0.01% for 152Eu and 154Eu, and 0.03% for 155Eu). The primary measurement of the purified 166mHo solution with the 4π (PC) β–γ coincidence technique was carried out at three gamma energy settings: a window around the 184.4keV peak and gamma thresholds at 121.8 and 637.3keV. The results show very good self-consistency, and the activity concentration of the solution was evaluated to be 45.640±0.098kBq/g (0.21% with k=1). The activity concentration of this solution was also measured by integral counting with a well-type 5″×5″ NaI(Tl) detector and efficiencies computed by Monte Carlo simulations using the GEANT code. These measurements were mutually consistent, while the resulting weighted average of the 4π NaI(Tl) method was found to agree within 0.15% with the result of the 4πβ–γ coincidence technique. An ampoule of this solution and the measured value of the concentration were submitted to the BIPM as a contribution to the Système International de Référence. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Applied Radiation & Isotopes is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – TitleFull: Purification and activity standardisation of a 166mHo solution
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              Text: Jun2008
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