Although gamma ray showers are muon-poor, they still produce a number of muons suucient to make the sources observed by GeV and TeV telescopes observable also in muons. For sources with hard gamma ray spectra there is a relativèenhancement' of muons from gamma ray primaries as compared to that from nucleon primaries. All shower gamma rays above the photo-production threshold contribute to the n...

The demand for gigabit-speed fiberoptic communication and the rising popularity of fiberoptics in RF/microwave systems have led to many advances in high-speed photodetector technology. Specific application requirements have spurred development of novel device structures to improve the speed, responsivity, and power-handling capabilities of high-speed detectors. Simultaneously, advances in mater...

A photoactivated gas detector operated at room temperature was microfabricated using a simple hydrothermal method. We report that the photoactivated gas detector can detect toluene using a UV illumination of 2 μW/cm². By ultraviolet (UV) illumination, gas detectors sense toluene at room temperature without heating. A significant enhancement of detector sensitivity is achieved because of the hig...

1350-4495/$ see front matter 2009 Elsevier B.V. A doi:10.1016/j.infrared.2009.05.024 * Corresponding author. Tel.: +1 404 413 6037; fax E-mail address: [email protected] (A.G.U. Perera). A GaAs/AlGaAs heterojunction is used as a spin-split-off band IR detector operating at or around room temperature. This detector structure followed a similar layer architecture to the quantum well IR photo detect...

In this paper we demonstrate that it is possible to produce low cost neutron-sensitive detectors using stereo-lithography additive manufacturing. A curable scintillating resin made by mixing BN:ZnS with a commercially available UV resin. This used print several small area neutron of arrays cones can be directly coupled photo-multiplier tube.

Alan Mathewson University College Cork National Microelectronics Research Center Lee Maltings, Prospect Row Cork, Ireland E-mail: [email protected] Abstract. Silicon, shallow junction, Geiger-mode avalanche photodiodes (APDs) can be manufactured with complementary metal-oxide semiconductor (CMOS) compatible processing steps and provide singlephoton-counting sensitivity. As we move toward providi...

The effect of the presence of a drift electric field on the response of gaseous and semiconductor radiation detectors to energetic X-rays (energies Eph from 20 to 200 keV) is investigated using the PENELOPE code to simulate the photo-absorption and the slow-down of the electrons produced in Si, Ge, and Xe gas at 1 atm. For typical drift fields, the energy Ed deposited in the detection media is ...

background: radon and its daughters are amongst the most important sources of natural exposure in the world. soil is one of the significant sources of radon/thoron due to both radium and thorium so that the emanated thoron from it may cause increased uncertainties in radon measurements. recently, a diffusion chamber has been designed and optimized for passive discriminative measurements of rado...

background: separate radon and thoron measurements in soil are very important in assessment of internal exposure due to inhalation of such radioactive gases. materials and methods: in this study, a low cost, small size, passive diffusion chamber has been developed for simple measurement of radon-222 and radon-220(thoron) gases separately in soil. the diffusion chamber consists of two films and ...