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[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] An Alpha and Beta counting system consisting of a micro controller-based electronic unit and detectors assembly was developed. The radiation detection unit consists of two proportional detectors (a main detector and a cosmic-ray guard detector) which can be easily disassembled for decontamination or repair. The detectors are mounted in a manual operating sample changer shielded by 5 cm of lead. Simplicity of maintenance and functional operation were taken into consideration in the design. The electronic unit supplies the high voltage and enables the operational functions including controls anti alarms. Calculations of net cpm of Alpha and Beta counting are displayed and can be printed. RS-232 communication option enables connection to a computer and operation of more sophisticated programs for calculations and data storage in the future (authors)
[en] Methods of sample pre-treatment, measurement and parameter determination are dealt with in this paper through the measurements of gross α β samples for purpose of an intercomparison. Based on the practice, approach is made towards the matters that should be brought to attention. (authors)
[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