A new generation of dosemeters, based on the scintillators LaBr, CeBr and SrI, read out with conventional photomultipliers, to be used in the field of environmental gamma-radiation monitoring, was investigated. The main features of these new instruments and especially their outdoor performance, studied by long-term investigations under real weather conditions, are presented. The systems were tested at the reference sites for environmental radiation of the Physikalisch-Technische Bundesanstalt. The measurements are compared with that of well characterized classical dose rate reference instruments to demonstrate the suitability of new spectrometers for environmental dose rate monitoring even in adverse weather conditions. Their potential to replace the (mainly Geiger Müller based) dose rate meters operated in about 5000 European early waning network stations as well as in environmental radiation monitoring in general is shown.
In the ISPRS final report from 2012 it was accented that light and low cost Unmanned Aerial Vehicles are playing a more and more important role when it comes to carrying remote sensing and photogrammetric sensors. Such platforms are characterized by a small weight, low cost of purchase and later exploitation and, depending on their technical specifications, a payload of about 1,5 kg. The above characteristics make these platforms an attractive alternative for carrying sensors in comparison to a traditional airplane, especially whilst conducting photogrammetric and remote sensing studies of small areas. However because of the size and mass of such UAV's, data acquired by means of the sensors which they carry is characterized by very dynamically changing in time exterior orientation parameters. In extreme cases this can cause no forward overlap between subsequent frames which makes such data, in most circumstances, useless. An interesting solution is using a video camera (or a number of video cameras) as a sensor. Such cameras enable, depending on the standard of registration, the acquisition of tens of images every second, which means a very large forward overlap. The article contains the analyses of the possibility of using the FCO HD 1080i and FCO HD 720i video cameras as a UAV sensor. Each of the analyzed cameras is different in terms of their build, as well as the quality of the acquired imagery, however that all have the same low weight. An evaluation was made in two different aspects: geometrical and photographic. Based on specialized test fields it was possible to determine the exterior orientation parameters ofthese cameras which allowed for an analysis of their invariability. Other parameters which had been determined and analyzed include: the spatial resolution, the way in which colours are registered and aberrations which were present within the optics of these cameras.
ABSTRACT:Nowadays the imagery data acquired from UAV sensors are the main source of all data used in various remote sensing applications, photogrammetry projects and in imagery intelligence (IMINT) as well as in other tasks as decision support. Therefore quality assessment of such imagery is an important task. The research team
Nuclear power plant accident 25 years later, it became obvious that real-time information is required to quickly gain radiological information. As a consequence, the European countries established early warning network systems with the aim to provide an immediate warning in case of a major radiological emergency, to supply reliable information on area dose rates, contamination levels, radioactivity concentrations in air and finally to assess public exposure. This is relevant for governmental decisions on intervention measures in an emergency situation. Since different methods are used by national environmental monitoring systems to measure area dose rate values and activity concentrations, there are significant differences in the results provided by different countries. Because European and neighboring countries report area dose rate data to a central data base operated on behalf of the European Commission, the comparability of the data is crucial for its meaningful interpretation, especially in the case of a nuclear accident with transboundary implications. Only by harmonizing measuring methods and data evaluation, is the comparability of the dose rate data ensured. This publication concentrates on technical requirements and methods with the goal to effectively harmonize area dose rate monitoring data provided by automatic early warning network systems. The requirements and procedures laid down in this publication are based on studies within the MetroERM project, taking into account realistic technical approaches and tested procedures. K: Data acquisition concepts; Dosimetry concepts and apparatus; Overall mechanics design (support structures and materials, vibration analysis etc); Radiation monitoring 1Corresponding author.
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