Cadmium telluride (CdTe) and cadmium zinc telluride (CdZnTe) have been regarded as promising semiconductor materials for hard X-ray and γray detection. The high atomic number of the materials (ZCd =48, ZTe=52) gives a high quantum efficiency in comparison with Si. The large band-gap energy (Eg ∼ 1.5 eV) allows us to operate the detector at room temperature. However, a considerable amount of cha...

The effect of moderate cooling on CdZnTe semiconductor detectors has been studied for the COBRA experiment. Improvements in energy resolution and low energy threshold were observed and quantified as a function of temperature. Leakage currents are found to contribute typically ∼5 keV to the widths of photopeaks.

We describe a new method of sensing the linear polarization of light using resonant cavity enhanced (RCE) photodetectors. The RCE detectors are constructed by integrating a thin absorption region into an asymmetric Fabry-Perot cavity. The top re ector is formed by the semiconductor air interface, while the bottom mirror is a Distributed Bragg Re ector (DBR). Quantum e ciency of these RCE device...

Microwave Kinetic Inductance Detectors, or MKIDs, have proven to be a powerful cryogenic detector technology due to their sensitivity and the ease with which they can be multiplexed into large arrays. A MKID is an energy sensor based on a photon-variable superconducting inductance in a lithographed microresonator, and is capable of functioning as a photon detector across the electromagnetic spe...

NIST X-RAY DETECTOR HEADS FOR COMMERCIALIZATION NIST has granted co-exclusive licenses to two private companies for commercialization of a revolutionary microcalorimeter-based x-ray detector with an energy resolution of 2 eV, some 50 times better than conventional semiconductor-based detectors. The new technology will be used in instruments for the characterization and analysis of materials by ...

The development of high-performance radiation detectors is essential for commercial, scientific, and securityapplications [1]. Due to the unique electronic properties of graphene (high-speed, low-noise), recent radiationdetectors utilize graphene field effect transistors to sense charge carriers produced by radiation interactions in agated semiconductor [2]. A study of the energy de...

Low Temperature Detectors have been used to measure embedded radioisotopes in a measurement mode known as Decay Energy Spectroscopy (DES) since 1992. DES microcalorimeter measurements for applications ranging from neutrino mass metrology safeguards and medical nuclides. While the low temperature detectors extremely high intrinsic energy resolution (several times better than semiconductor detect...

This paper proposes a multiple-model (MM) hypothesis testing approach for detection of unknown target maneuvers that may have several possible prior distributions. An MM maneuver detector based on sequential hypothesis testing is developed. Simulation results that compare the performance of the proposed MM detector to that of traditional maneuver detectors are presented. They demonstrate that t...