K shell parameters of some lanthanide elements using bremsstrahlung

Niranjana, K.M.; Badiger, N.M.

doi:10.1016/j.radphyschem.2014.09.013

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…Another class of metals that is ideally suited for micro-CT are the lanthanides (e.g. gadolinium, erbium) 33 , which have k edges (38–64 keV) 34 that coincide with the peaks of the x-ray energy distributions typically used in high-resolution in vivo micro-CT scanners (typically operating at below 100 kVp). The ideal position of the k-edges offers potential to increase contrast attenuation for single-energy micro-CT scans 33 and, more importantly, offers the opportunity to match the available x-ray spectrum and contrast agent in dual-energy micro-CT, which is used to distinguish contrast-enhanced vessels from inherently high-attenuating tissues (e.g.…”

Section: Introductionmentioning

confidence: 99%

PEG-modified gadolinium nanoparticles as contrast agents for in vivo micro-CT

Cruje

Dunmore-Buyze

Grolman

et al. 2021

Sci Rep

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Vascular research is largely performed in rodents with the goal of developing treatments for human disease. Micro-computed tomography (micro-CT) provides non-destructive three-dimensional imaging that can be used to study the vasculature of rodents. However, to distinguish vasculature from other soft tissues, long-circulating contrast agents are required. In this study, we demonstrated that poly(ethylene glycol) (PEG)-coated gadolinium nanoparticles can be used as a vascular contrast agent in micro-CT. The coated particles could be lyophilized and then redispersed in an aqueous solution to achieve 100 mg/mL of gadolinium. After an intravenous injection of the contrast agent into mice, micro-CT scans showed blood pool contrast enhancements of at least 200 HU for 30 min. Imaging and quantitative analysis of gadolinium in tissues showed the presence of contrast agent in clearance organs including the liver and spleen and very low amounts in other organs. In vitro cell culture experiments, subcutaneous injections, and analysis of mouse body weight suggested that the agents exhibited low toxicity. Histological analysis of tissues 5 days after injection of the contrast agent showed cytotoxicity in the spleen, but no abnormalities were observed in the liver, lungs, kidneys, and bladder.

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Section: Introductionmentioning

confidence: 99%

PEG-modified gadolinium nanoparticles as contrast agents for in vivo micro-CT

Cruje

Dunmore-Buyze

Grolman

et al. 2021

Sci Rep

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“…The K shell oscillator strength is the probability of transition of the K shell electrons to all allowable states. Several investigators determined the Davisson-Kirchner ratio and/ or K shell oscillator strength values for the different elements [34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Chemical effect on theKshell absorption parameters of some selected cerium compounds

2016

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In this study, the photoelectric cross section values of Ce, CeCl 3 .7H 2 O, Ce 2 (SO 4 ) 3 , Ce(OH) 4 and Ce 2 O 3 samples were measured in the energy range from 31.82 keV up to 51.70 keV by adopting in narrow beam geometry. Using these photoelectric cross sections, the K shell photoelectric cross sections at the K-edge, the K shell absorption jump ratios and jump factors, the Davisson-Kirchner ratios and K shell oscillator strength values were estimated experimentally. The measured parameters were compared with the theoretical calculated values. It is observed that the K shell photoelectric cross section at the K-edge and K shell oscillator strength values of an element are affected by the chemical environment of material while the K shell absorption jump ratio, K shell absorption jump factor and Davisson-Kirchner ratio are not affected by the chemical environment of material for the present samples. To the best of our knowledge, the chemical effects on the Davisson-Kirchner ratio and K shell oscillator strength have not been discussed for any element by now.

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“…They observed that positive as well as negative shifts in K shell binding energy for different compounds of the same element. Niranjana and Badiger [34] determined the K edge energy, K shell photoelectric cross section at the K edge, K shell absorption jump ratio, jump factor and Davisson-Kirchner ratio for Tb and Ho using an external bremsstrahlung radiation and a HPGe detector spectrometer.…”

Section: Introductionmentioning

confidence: 99%

Determination of K shell absorption parameters for some lanthanides using the X-ray attenuation method

2015

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The total attenuation cross section at the K edge, absorption jump ratio, jump factor, Davisson-Kirchner ratio and oscillator strength parameters for the K shell were determined by measuring the total attenuation cross sections around the K edge for Pr, Nd 2 O 3 and Sm. The measurements were performed in a secondary excitation geometry using the Kα 2 , Kα 1 , Kβ 1 and Kβ 2 X-rays (in the region from 31.817 to 55.293 keV) from different secondary source targets excited by the 59.54 keV γ-photons from an 241 Am annular source. It is the first time that the Davisson-Kirchner ratio values have been determined for present samples. The experimental results were compared with the theoretically calculated and other available experimental results.

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K shell parameters of some lanthanide elements using bremsstrahlung

Cited by 6 publications

References 16 publications

PEG-modified gadolinium nanoparticles as contrast agents for in vivo micro-CT

PEG-modified gadolinium nanoparticles as contrast agents for in vivo micro-CT

Chemical effect on theKshell absorption parameters of some selected cerium compounds

Determination of K shell absorption parameters for some lanthanides using the X-ray attenuation method

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