A simple effective method for estimating the [18O] enrichment of water mixtures

Fawdry, R.M.

doi:10.1016/j.apradiso.2003.09.010

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…The effects on the enrichment grade of the individual process steps were examined via pycnometry [17,18]. With an increased amount of [ 18 …”

Section: Determination Of the Degree Of Enrichment Via Pycnometrymentioning

confidence: 99%

“…The effects on the enrichment grade of the individual process steps were examined via pycnometry [17,18] Since the number of atoms is proportional to the volume, the enrichment grade is dependent on the density (ρ = m/V) at constant temperature. Hence, the enrichment grade is determined by simple weighing in combination with volume measurement, whereas the density is temperature dependent.…”

Section: Determination Of the Degree Of Enrichment Via Pycnometrymentioning

confidence: 99%

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Optimized Treatment and Recovery of Irradiated [18O]-Water in the Production of [18F]-Fluoride

Uhlending¹,

Henneken²,

Hugenberg³

et al. 2018

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Enriched [ 18 O]-water is the target material for [ 18 F]-fluoride production. Due to its high price and scarce availability, an increased interest and necessity has arisen to recycle the used water, in order to use it multiple times as a target material for [ 18 F]-fluoride production. This paper presents an efficient treatment and reprocessing procedure giving rise to high chemical quality [ 18 O]-water, thereby maintaining its enrichment grade. The reprocessing is subdivided into two main steps. In the first step, the [ 18 F]-FDG (fluorodeoxyglucose) synthesis preparation was modified to preserve the enrichment grade. Anhydrous acetonitrile is used to dry tubing systems and cartridges in the synthesis module. Applying this procedure, the loss in the enrichment throughout the reprocessing is <1%. The second step involves a fractional distillation in which the major part of the [ 18 O]-water was recycled. Impurities such as solvents, ions, and radioactive nuclides were almost completely separated. Due to the modified synthesis preparation using acetonitrile, the first distillation fraction contains a larger amount of an azeotropic

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“…The effects on the enrichment grade of the individual process steps were examined via pycnometry [17,18]. With an increased amount of [ 18 …”

Section: Determination Of the Degree Of Enrichment Via Pycnometrymentioning

confidence: 99%

Section: Determination Of the Degree Of Enrichment Via Pycnometrymentioning

confidence: 99%

Optimized Treatment and Recovery of Irradiated [18O]-Water in the Production of [18F]-Fluoride

Uhlending¹,

Henneken²,

Hugenberg³

et al. 2018

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“….36 % lower atomic number density difference for D 2 O as compared to H 2 O (as tabulated byLemmon et al (2012) at a representative temperature of 24.2 • C), and therefore much smaller than the other experimental uncertainties in our experiments. Indeed, the work ofFawdry (2004) suggests that the atomic number density of H 2 18 O is greater than that of H 2 nat O by only ∼ 0.05 %.…”

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confidence: 99%

The bound coherent neutron scattering lengths of the oxygen isotopes

Fischer¹,

Simonson²,

Neuefeind³

et al. 2012

J. Phys.: Condens. Matter

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The technique of neutron interferometry was used to measure the bound coherent neutron scattering length b(coh) of the oxygen isotopes (17)O and (18)O. From the measured difference in optical path between two water samples, either H(2)(17)O or H(2)(18)O versus H(2)(nat)O, where nat denotes the natural isotopic composition, we obtain b(coh,(17)O) = 5.867(4) fm and b(coh,(18)O) = 6.009(5) fm, based on the accurately known value of b(coh,(nat)O) = 5.805(4) fm which is equal to b(coh,(16)O) within the experimental uncertainty. Our results for b(coh,(17)O) and b(coh,(18)O) differ appreciably from the standard tabulated values of 5.6(5) fm and 5.84(7) fm, respectively. In particular, our measured scattering-length contrast of 0.204(3) fm between (18)O and (nat)O is nearly a factor of 6 greater than the tabulated value, which renders feasible neutron diffraction experiments using (18)O isotope substitution and thereby offers new possibilities for measuring the partial structure factors of oxygen-containing compounds, such as water.

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Simple purification of recovered [18O]H2O by UV, ozone, and solid-phase extraction methods

Moon

Cheon

et al. 2007

Applied Radiation and Isotopes

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A simple effective method for estimating the [18O] enrichment of water mixtures

Cited by 4 publications

References 15 publications

Optimized Treatment and Recovery of Irradiated [18O]-Water in the Production of [18F]-Fluoride

Optimized Treatment and Recovery of Irradiated [18O]-Water in the Production of [18F]-Fluoride

The bound coherent neutron scattering lengths of the oxygen isotopes

Simple purification of recovered [18O]H2O by UV, ozone, and solid-phase extraction methods

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