A real time visualisation method, to be used in mobile gamma-spectrometric search operations using standard detector systems is presented. The new method, called deviation display, uses a modified waterfall display to present relative changes in spectral data over energy and time. Using unshielded (137)Cs and (241)Am point sources and different natural background environments, the behaviour of ...

according to the report published by the united nations scientific committee on the effects of atomic radiation (unscear) in 2000, ramsar city in northern iran, has some inhabited areas with the highest known natural background radiation levels in the world (1). the annual radiation absorbed dose in high background radiation areas (hbras) of ramsar is extraordinary high, reaching 260 msv that i...

We have repeated our earlier observations of the Infrared and submllllmeter background radiation. While the measured values of the infrared background radiation remain unchanged, we have failed to observe the high flux previously reported for the 0.4 to 1.3 mm range. This indicates that the flux cannot have been galactic or cosmic, but further observations are needed to rule out a solar cycle d...

The sudden drop of the beam life time and bursts of background radiation were detected in many machines and associated with microscopic dust particles. We present the model of the dust particle dynamics explaining the long time of the dust events observed in the PEP-II B-factory and BEPC-II machines.

The lectures describe several cosmological effects produced by neutrinos. Upper and lower cosmological limits on neutrino mass are derived. The role that neutrinos may play in formation of large scale structure of the universe is described and neutrino mass limits are presented. Effects of neutrinos on cosmological background radiation and on big bang nucleosynthesis are discussed. Limits on th...

In a recent paper [1] it has been suggested that the velocity of light and the expansion of the universe are two aspects of one single concept connecting space and time in the expanding universe. It has then be shown that solving Friedmann's equations with that interpretation (and keeping c = constant) can explain number of unnatural features of the standard cosmology (for example: the flatness...

The early universe according to the big bang and the grand unified theories is discussed. The shortcomings of big bang are summarized together with their resolution by inflationary cosmology. Inflation, the subsequent oscillation and decay of the inflaton, and the resulting ‘reheating’ of the universe are studied. The density perturbations produced by inflation and the temperature fluctuations ...

The internship began on Monday, 22nd June, under the supervision of Sohaib Shamim. First, I had to learn the basics of LabVIEW, a graphical programming language that is used extensively in the Physics Lab. We started with a simple LabVIEW tutorial, gaining some familiarity with the key features of LabVIEW, such as the Front Panel, Block diagram, functions toolbox etc. The first exercises requir...

We have repeated our earlier observations of the Infrared and submllllmeter background radiation. While the measured values of the infrared background radiation remain unchanged, we have failed to observe the high flux previously reported for the 0.4 to 1.3 mm range. This indicates that the flux cannot have been galactic or cosmic, but further observations are needed to rule out a solar cycle d...