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Abstract-Te inclusions existing at high concentrations in CdZnTe (CZT) material can degrade the performance of CZT detectors. These microscopic defects trap the free electrons generated by incident radiation, so entailing significant fluctuations in the total collected charge and thereby strongly affecting the energy resolution of thick (long-drift) detectors. Such effects were demonstrated in thin planar detectors, and, in many cases, they proved to be the dominant cause of the low performance of thick detectors, wherein the fluctuations in the charge losses accumulate along the charge's drift path. We continued studying this effect using different tools and techniques. We employed a dedicated beam-line recently established at BNL's National Synchrotron Light Source for characterizing semiconductor radiation detectors, along with an IR transmission microscope system, the combination of which allowed us to correlate the concentration of defects with the devices' performances. We present here our new results from testing over 50 CZT samples grown by different techniques. Our goals are to establish tolerable limits on the size and concentrations of these detrimental Te inclusions in CZT material, and to provide feedback to crystal growers to reduce their numbers in the material.
Many patients with PD and dementia experience psychosis. Psychotic symptoms in PD dementia patients are associated with major behavioral, cognitive, and functional problems.
SummaryThe European Working Time Directive and the New Deal have decreased the number of hours worked by anaesthetic trainees. We implemented the Working Time Directive in May 2004 and evaluated the effect of its implementation on training. During two 6-month periods, one before and one after the change, we determined the number of operating lists undertaken by each Specialist Registrar in Anaesthesia. After implementation of the Working Time Directive, the mean number of lists performed by Specialist Registrars decreased from 24 to 21 lists per registrar per month, a 13% decrease. Exposure to subspecialty lists was the same in both periods, but this was at the expense of general lists and those in remote locations. We conclude that the Working Time Directive has had a measurable impact on the training of paediatric anaesthetists, but that the significance of this change for clinical practice has not yet been measured.
Abstract-Te inclusions existing at high concentrations in CdZnTe (CZT) material can degrade the performance of CZT detectors. These microscopic defects trap the free electrons generated by incident radiation, so entailing significant fluctuations in the total collected charge and thereby strongly affecting the energy resolution of thick (long-drift) detectors. Such effects were demonstrated in thin planar detectors, and, in many cases, they proved to be the dominant cause of the low performance of thick detectors, wherein the fluctuations in the charge losses accumulate along the charge's drift path. We continued studying this effect using different tools and techniques. We employed a dedicated beam-line recently established at BNL's National Synchrotron Light Source for characterizing semiconductor radiation detectors, along with an IR transmission microscope system, the combination of which allowed us to correlate the concentration of defects with the devices' performances. We present here our new results from testing over 50 CZT samples grown by different techniques. Our goals are to establish tolerable limits on the size and concentrations of these detrimental Te inclusions in CZT material, and to provide feedback to crystal growers to reduce their numbers in the material.
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