The Photomagnetoelectric Effect in Mercury Iodide
In order to investigate the transport properties of mercury iodide, measurements of photomagnetoelectric (PME) effect and photoconductivity (PC) have been carried out. The experimental results show the presence of trapping phenomena and a strong dependence of carrier lifetimes on the light injection level. The obtained values of the lifetimes are in the range 10-7-10-6 s.
Photoelectronic properties of HgI2
Two types of photoelectronic measurements have been used to determine the properties of HgI2 crystals and photodetector cells: thermally stimulated conductivity, and spectral response of photoconductivity in both the lateral and transverse geometries. Characteristic trap depths are identified that compare well with previously reported values, and a decrease in apparent density with time and temperature cycling is described. Analysis of photoconductivity spectral response using the DeVore model for lateral contacts and the Goodman model for transverse contacts allows the determination of photoelectronic parameters for the material.
New Approaches for Positron Emission Tomography ( PET ) in Breast Carcinoma
Positron Emission Tomography (PET) is a nuclear medicine imaging technique which allows the quantitative evaluation of the distribution of several pharmaceuticals in a target area. PET therefore provides valuable information on the biochemical and biological activity inside a living subject in a noninvasive way, combining techniques applied in nuclear medicine with the precise localization achieved by computerized image reconstruction.