We report on a broadband GaAs/AlAs superlattice detector for THz radiation; a THz field reduces the current through a superlattice, which is carried by miniband electrons, due to modulation of the Bloch oscillations of the miniband electrons. We studied the detector response, by use of a free electron laser, in a large frequency range ~5–12 THz!. The responsivity showed strong minima at frequen...

A near-IR radiometer standard with similar performance to silicon trap-detectors has been developed to calibrate detectors and radiometers for absolute spectral power, irradiance, and radiance responsivities between 950 nm and 1650 nm. The new radiometer standard is utilized at the Spectral Irradiance and Radiance Responsivity Calibrations using Uniform Sources (SIRCUS) which is the reference c...

Bhabha atomic research centre has been exploring some of the unique features of silicon detector in a variety of nuclear structure experiment using high-energy photons and heavy ions projectiles. Current experimental application make use of large area silicon detector with depletion thickness of ~150-1000 μm. The low cost silicon detector shows excellent energy and position resolution. In this ...

An intense 146 MeV/c pion beam was stopped inside a scintillating fiber detector made out of 12 planes with 16 pixels each, where every pixel consists out of 8 × 8 scintillating fibers of 500 μm diameter dense packed. The detector was irradiated for 52 hours to more than 1 Mrad at its center. Before and directly after the irradiation the detector has been exposed to a particle beam to compare t...

The Transition Radiation Detector (TRD) belongs to the central barrel detectors of the ALICE experiment at the LHC at CERN. It is composed of 540 large area drift chambers, with a total of 1181952 readout pads (1728 or 2304 per chamber). To ensure the optimal performance of the detector, designed for electron/pion identification and charged particle tracking, including triggering for high-pt el...

The LHCb experiment at the LHC will upgrade its detector to take data at luminosities of above 1033 cm−2s−1 from 2018 onwards. The fully upgraded detector will use a new front-end electronics to readout collision events at 40MHz. A new fully software based trigger will be implemented and will increase the trigger efficiencies, specially in the hadronic decay channels. The silicon vertex detecto...

Studies have been performed on the effects of radiation on ASICs incorporating bipolar npn transistors in the AMS 0.8 μm BiCMOS process. Radiation effects are reviewed and the approach used to achieve radiation tolerant ASICs is described. The radiation tests required to validate the ASICs for use in the ATLAS detector at the CERN Large Hadron Collider are discussed. The results demonstrate tha...

Introduction Radioactive materials naturally exist in the world. Indeed, approximately 82% of human-absorbed radiation doses, which are out of human control, arise from natural sources of radiation including cosmic, terrestrial, and exposure through inhalation or ingestion. Thus, the aim of the present study was to estimate health risk, as well as the effective and organ doses from naturally oc...