A seesaw-type subduction/exhumation model is proposed to explain this age disparity and the subduction of the South China Block becomimg shallower towards the west.”
“YVO4:Bi3+,Eu3+ nanophosphors at a high Bi3+ Concentration of 15 at% are synthesized from a Bi3+ source, nitrates

of yttrium and europium(III), and sodium orthovanadate(V) by a low-temperature aqueous precipitation in the presence Crenigacestat in vivo of citrate ions. When an ethylene glycol solution of bismuth(III) nitrate is used as a Bi3+ source, YVO4:Bi3+,Eu3+ nanophosphors of similar to 20 nm in size crystallize during aging at 85 degrees C without any by-products where the contents of Bi3+ and Eu3+ incorporated into crystalline YVO4 are close to the respective nominal contents, as confirmed by transmission electron microscopy, X-ray diffractometry and X-ray fluorescent analysis. These nanophosphors show red emission corresponding to the f-f transition of Eu3+ under the excitation of Bi3+-V5+ charge transfer. When aging is continued after the completion of the crystallization, the photoluminescence intensity of nanophosphors reaches the constant value. This

is the improved behavior in comparison to our previous work, where the photoluminescence intensity decreases after BMS-777607 the prolonged aging because of the inhomogeneous doping of Bi3+ ions, and hence the concentration quenching. (C) 2009 Elsevier B.V. All rights reserved.”
“The aim of the study was to check the validity of computed tomographic (CT) doses exhibited by SPECT/CT and PET/CT hybrid devices. Dose measurements were taken from four SPECT/CT and four PET/CT cameras commercially available from different manufacturers. A calibrated ionization chamber was placed in whole-body or head phantoms for the acquisition MK-8931 purchase of CT images with clinically used parameters. Computed tomography dose index (CTDIvol) values were calculated according to the IEC 60601-2-44:1999 formula. The measured CTDIvol doses were compared

with those preprogrammed by the manufacturer. In the case of the whole-body phantom, the differences between the measured and displayed values varied between -31 and +24% [European document RP162 (2012) sets up the limit for acceptance criterion as +/- 20%]. The head phantom data showed either an agreement between -10 and +24%, or an underestimation by two-fold. The latter seemed to be because, while preprogramming the doses, the manufacturer had used the whole-body phantom instead of a proper head phantom. The results of the work demonstrate the need for individual dosimetric calibration of every single X-ray tube. Dosimetric checks should be included in the regular quality control programmes of the SPECT/CT and PET/CT devices.