Radionuclide Imaging

Upham, Loraine V.; Englert, David

doi:10.1016/b978-012436603-9/50018-1

Cited by 5 publications

(2 citation statements)

References 60 publications

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“…156 keV maximal beta energy of this emitter is suitable for film autoradiography, giving high resolution images. The sample is put against a photographic film and the radiation causes the film to darken (Upham and Englert, 2003).…”

Section: Methodsmentioning

confidence: 99%

Free radical polymerisation of methacrylates with thermal initiator in clay rock

Sammaljärvi

Rama

Ikonen

et al. 2016

Engineering Geology

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Clay rock porosity analysis with C-14-PMMA autoradiography was the focus of this work. Methodology for impregnating clay rock with C-14 labelled methacrylate, and fixing it via free radical polymerisation initiated with thermal initiator was developed towards this end. The effect of drilling was of particular interest because of their effect on the porosity and therefore they were studied in detail. Two different methacrylates were tested in this work. C-14 labelling enables measuring porosity through the autoradiography of samples impregnated with methyl methacrylate (MMA). The supporting analysis was done with thermogravimetric analysis (TGA), Scanning Electron Microscopy supplemented by energy dispersive X-ray spectrometry (SEM/EDAX) and X-ray diffraction (XRD). Procedures for impregnating clay rock and fixing C-14-labelled methacrylates in the sample were developed and optimised successfully. The two clay rock discs studied had mean porosities of (7.9 ± 0.8) % and (7.6 ± 0.8) % as measured by autoradiography. Autoradiography also shows that a disturbed zone can be seen as a region of high porosity in the drilled clay rock cores. In this case, the porosity of the disturbed zone is more or less double of the bulk porosity. TGA measurements gave bulk porosity values that varied between 4.1-15.0%. The TGA values were uncertain due difficulties associated with the sample matrix degrading at the same time as the methacrylate inside the sample. They could still be used to estimate the general range of the porosity. Pure MMA gave bulk porosity of (12.9 ± 7.5) % while mixture composed of 75% Hydroxyethyl methacrylate (HEMA) and 25% MMA gave a bulk porosity of (4.1 ± 6.0) %. SEM/EDAX results showed that calcite grains were more fractured than quartz grains in the disturbed zones. Quartz grains were mostly unaffected. This supports the conclusion that the porosity increase in the disturbed zone is intergranular and result of the break-up of calcite grains.

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Section: Methodsmentioning

confidence: 99%

Free radical polymerisation of methacrylates with thermal initiator in clay rock

Sammaljärvi

Rama

Ikonen

et al. 2016

Engineering Geology

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“…With a microscope the source structure, crystal size and irregularities can be visualized (figure 4(a)). The activity distribution, and thus the homogeneity, can be displayed by making autoradiographs of the source using photographic film, a phosphor screen or a solid track detector (figure 4(b)) [28][29][30][31]. A measure of the self-absorption of the source is given by the variation of the β-efficiency [32] or the peak-shape parameters of an alpha-particle peak [33].…”

Section: Methods To Check and Improve Source Qualitymentioning

confidence: 99%

Preparation of radioactive sources for radionuclide metrology

Sibbens¹,

Altzitzoglou²

2007

Metrologia

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The final accuracy of a radioactivity measurement can depend to a high degree on the quality of the radioactive sources used. In this paper the most important source preparation technique for radionuclide metrology is described in detail, namely the quantitative preparation of solid sources by drop deposition. Different steps in this source preparation procedure are described, such as preparation of source supports, preparation of dilutions, quantitative drop deposition by the pycnometer method, mass determination, control and improvement of the source quality and the uncertainty calculations involved. Other source preparation techniques of special interest are briefly mentioned and the handling and storage of solutions and sources are discussed.

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