Results 1 - 10 of 75274
Results 1 - 10 of 75274. Search took: 0.07 seconds
|Sort by: date | relevance|
[en] In recent years the astro-particle community is involved in the realization of experimental apparatuses for the detection of high-energy neutrinos originated in cosmic sources or produced in the interaction of Cosmic Rays with the Cosmic Microwave Background. For neutrino energies in the TeV-PeV range, the optical Cherenkov technique is considered optimal. Water (or Ice)-Cherenkov technique is based on the detection of the charged leptons generated in the neutrino charged current weak interactions with the medium surrounding the detector. Those detectors measure the visible Cherenkov photons originated by charged particles propagating at velocities greater than the speed of light through a transparent medium and consist of array of photomultipliers. The charged-particle track can be reconstructed measuring the time of arrival of the Cherenkov photons on the photomultipliers. An overview of the current status of those experiments will be given.
[en] The principle of determining the atomized concentration by β-ray transmission measurement is described. The laboratory calibration was carried out with the wet filter paper to simulate water content in the air, from which the quantitative relation between the β-ray count rate and water content in the air was derived. Therefore, the atomized concentration can be determined by using the β-ray count rate measured in situ and the calibration curve. The tests in situ show that the β-ray transmission method used to measure the atomized concentration during the period of flood discharge from the high dam in hydro-power stations is precise, rapid and has a higher sensitivity than the γ-ray transmission method
[en] This Technical Report shows a computer System named: Interface for the Control of CMS Detector (IC''3MS), whose main objective is to provide a design and advice tool which can be used for the assembly of super layers for the Compacts Muon Solenoid. This computer application is divided up into three independent modules that maintain a proper connection between them. These modules correspond to the three principal actors that control the assembly we said before. These actors are the analysts, that determine the control routines, the engineers, that specify the control details and finally the workers who use the control routines. This application has been developed as a collaboration between the Experimental Physic of Particles; which belongs to the Fusion and Elementary particles department and the Special Project Group, belonging to the Information Technologies Department, both them from the CIEMAT (Author)
[en] India based Neutrino Observatory (INO) is going to use approximately 30,000 resistive plate chamber detector having dimension 2m x 2m. Resistive Plate chambers are parallel plate fast gaseous detector made up of high resistivity (1012 ohm-cm2) of glass or bakelite. Handling of glass of above dimension is very challenging due to its fragility. Disqualifying rate of such RPC is higher than the other material electrodes. To overcome the drawbacks of the above RPC detectors search of new material for the electrodes is required. The basic criteria for the selection of new material should be light weight, low cost, non-fragile and locally available
[en] Although potentially very useful as a screening tool, currently-applied 'gross' alpha/beta analyses are often considered unreliable by the environmental monitoring community. We describe here an alternative approach based on direct counting of pressed soil 'wafers' to estimate total alpha/beta activities. The system was calibrated using a series of natural soils and sediment standards with total α/β activities estimated by use of a combination of available certified values, equilibrium assumptions, and our own measurements. A set of 10 such standards that span a wide range of activities were prepared by thoroughly mixing several grams of selected NIST and IAEA natural matrix standards together with reagent grade cellulose in a 4:1 sample-to-binder ratio and pressing in a 40-mm stainless steel die. The resulting wafers, assumed to be at infinite thickness for expected radionuclides, were counted in a gas flow proportional counter set for simultaneous α/β counting. Both the alpha and beta count rates increased in a linear, systematic manner with increasing total estimated activities. This technique should prove to be an inexpensive, simple, and waste-free approach for screening total radioactivity in soil samples. (author)