نتایج جستجو برای: 131 cs source
تعداد نتایج: 464425 فیلتر نتایج به سال:
Background and purpose: Heavy metals in urban air are major health threats and increase the risk of respiratory, cardiovascular, and cancers in humans. An efficient and low-cost method for monitoring these pollutants is using tree bark as a bioindicator. The purpose of this study was to measure the concentration of heavy metals by pine tree bark as a bioindicator in Neishabur, north-east of Ira...
Compressed sensing (CS) is a mathematical framework that reconstructs data from highly undersampled measurements. To gain acceleration in acquisition time, CS has been applied to MRI and has been demonstrated on diverse MRI methods. This review discusses the important requirements to qualify MRI to become an optimal application of CS, namely, sparsity, pseudo-random undersampling, and nonlinear...
OBJECTIVE The European Registry on Cushing's syndrome (ERCUSYN) is designed to collect prospective and follow-up data at EU level on Cushing's syndrome (CS). DESIGN AND METHODS Baseline data on 481 CS patients (390 females, 91 males; mean age (±s.d.): 44±14 years) collected from 36 centres in 23 countries, including new patients from 2008 and retrospective cases since 2000. Patients were divi...
Poisson statistics were studied using the radioactive decay of Cs as a source. A scintillation counter measured gamma rays emitted by Cs as well as background from cosmic rays and other experiments in the laboratory. Data from approximate mean rates of 1, 4, 10 and 100 counts/sec was compared to both theoretical Poisson distributions and Monte Carlo simulations. The reduced chi squared values f...
The Radionuclide Metrology Laboratory (RML) from IFIN-HH organized proficiency tests regarding the measurement of the radioactive content of the food products, water equivalent, with the involved laboratories. RML prepared 14 solid volume sources, of cylindrical shape, containing a mixture of Cs-134 and Cs-137 radionuclides, uniformly distributed in a water equivalent matrix. 13 participants fr...
Tomographic imaging with radionuclides commonly used in nuclear medicine, such as $^{111}$In (171 and 245 keV) $^{131}$I (364 keV), is high demand for medical applications small animal imaging. The Si/CdTe Compton camera its angular energy resolutions an especially promising detector to extend the coverage range that covers gamma-ray emitted from these radionuclides. Here, we take first steps t...
OBJECTIVE To prospectively investigate the diagnostic accuracy of dual-source 64-slice computed tomography coronary angiography (CTCA), calcium scoring (CS) and both methods combined for assessing significant coronary artery stenoses relative to conventional coronary angiography (CCA). DESIGN, SETTING AND PATIENTS Prospective, single-centre study conducted in a referral centre enrolling 74 co...
the world wide web becomes very popular recently and plays an influential role in english learning. by burgeoning role of source-based writing as partial fulfillment of tefl courses and vast use of the internet, lack of empirical studies to explore these areas is obvious. this study aimed to explore the effect of the amount of familiarity with the web (internet literacy) on junior english stude...
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