The discovery by the BeppoSAX satellite of X-ray afterglow emission from the γ-ray burst which occurred on 28 February 1997 produced a revolution in our knowledge of the γ-ray burst phenomenon. Along with the discovery of X-ray afterglows, the optical afterglows of γ-ray bursts were discovered and the distance issue was settled, at least for long γ-ray bursts. The 30 year mystery of the γ-ray b...

In this paper, we report the γ-ray sterilization effects in pH-sensitive polysilicon wire (PSW) sensors using a mixture of 3-aminopropyltriethoxysilane (γ-APTES) and polydimethylsiloxane (PDMS)-treated hydrophobic fumed silica nanoparticles (NPs) as a sensing membrane. pH analyses showed that the γ-ray irradiation-induced sensitivity degradation of the PSW pH sensor covered with γ-APTES/silica ...

This paper summarizes recents results in γ-ray astronomy, most of which were derived with data from groundbased γ-ray detectors. Many of the contributions presented at this conference involve multiwavelength studies which combine ground-based γ-ray measurements with optical data or space-based X-ray and γ-ray measurements. Besides measurements of the diffuse emission from the Galaxy, observatio...

Using high-resolution radio imaging with VLBI techniques, the TANAMI program has been observing the parsec-scale radio jets of southern (declination south of −30◦) γ-ray bright AGN simultaneously with Fermi /LAT monitoring of their γ-ray emission. We present the radio and γ-ray properties of the TANAMI sources based on one year of contemporaneous TANAMI and Fermi /LAT data. A large fraction (72...

background: the existence of some radionuclides in soil and some building materials produce a β-γ radiation field, which in some regions the exposure of these radionuclides to human is high. materials and methods: the air-absorbed dose, indoor and outdoor annual effective dose of soil and some building material samples (ceramic, granite, gypsum, etc.). the samples were collected from 35 differe...

Progress in accelerator physics and laser physics has enabled us to generate a new generation of laser Compton scattering (LCS) γ-ray beam. The LCS γ-ray beam has been used for the study of fundamental science and industrial applications. We present examples of some applications using the LCS γ-ray beam and possibility using the next generation of high-intense LCS γ-ray beam provided from the E...

A method to extract primary γ-ray spectra from particle-γ coincidences at excitation energies up to the neutron binding energy is described. From these spectra, the level density and γ-ray strength function can be determined. From the level density, several thermodynamical quantities are obtained within the microcanonical and canonical ensemble. Also models for the γ-ray strength function are d...

I review some of the basic observational details of jets from X-ray binaries, or ‘microquasars’. It is shown that in both (Z and Atoll) NS and BHC systems radio emission, and therefore jet formation, is correlated with the presence of hard (30–500 keV) X-ray emission. At γ-ray (> 500 keV) energies, the relation is not so clear. Possible physical connections between the presence of a jet, with a...

abstract  introduction: recently uses of medium and high energy x-rays has been increased in iran and radiotherapy centers along with a variety of accelerators have been installed in some provinces. in the other hand there is no sufficient skill in designing and making radiotherapy treatment rooms. this study was conducted to evaluate the efficacy of different mixtures of barite concrete for sh...