Mini Compton Camera Based on an Array of Virtual Frisch-Grid CdZnTe Detectors

New Results from Performance Studies of Frisch-Grid CdZnTe Detectors

New data regarding performance studies of Frisch-grid CdZnTe (CZT) detectors are presented. The Frisch-grid detector configuration under investigation is a bar shaped CZT crystal with the side surfaces coated with an insulating layer. A Frisch grid is fashioned by inserting the CZT bar into a metallic sleeve, or by depositing the metal directly upon the insulator; hence the semiconductor materi...

CdZnTe Frisch collar detectors for g-ray spectroscopy

Low-energy g-ray spectra were collected from Am, Co, Ba, Au, Cs and U using a 3.4 3.4 5.7mm CdZnTe detector utilizing an insulated Frisch ring. The CdZnTe detector was fabricated from a single crystal and a copper shim was used as the Frisch collar. Room-temperature energy resolution of 1.45% full-width half-maximum (FWHM) was obtained for Cs at 661.7 keV without electronic correction. The dete...

Optimization of virtual Frisch-grid CdZnTe detector designs for imaging and spectroscopy of gamma rays

In the past, various virtual Frisch-grid designs have been proposed for cadmium zinc telluride (CZT) and other compound semiconductor detectors. These include three-terminal, semi-spherical, CAPture, Frisch-ring, capacitive Frisch-grid and pixel devices (along with their modifications). Among them, the Frisch-grid design employing a noncontacting ring extended over the entire side surfaces of p...

Evaluation of a Compton scattering camera using 3-D position sensitive CdZnTe detectors

A CZT Compton Camera (CCC) is being built using two three-dimensional (3-D) position-sensitive CZT detectors. Expected system performance was analyzed by analytical and Monte Carlo approaches. Based on the measurement of detector energy and position resolution, the expected angular resolution is &33 and &23 for a $303 FOV for 511 keV and 1 MeV c-rays, respectively. The intrinsic e$ciency for a ...

Biparametric Analyses of Charge Trapping in Cd0.9Zn0.1Te Based Virtual Frisch Grid Detectors