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Stuttgart, Germany

Seyis C.,TUBITAK - Marmara Research Center | Inan S.,TUBITAK - Marmara Research Center | Streil T.,SARAD GmbH
Acta Geophysica | Year: 2010

Geothermally active sites compared to a relatively passive site (no geothermal activity) contain much higher radon in the soil. As expected, the maximum soil radon content is at or near the major fracture zone where hot water emanates to the surface. Thus, buildings in geothermal sites nearby or at top of cracks that facilitate hot-water transfer to the surface may be extremely dangerous in terms of high radon concentrations and this situation may pose a big threat for the inhabitants. Controlled aeration of such high-risk buildings must be carefully and continuously conducted. © 2010 Versita Warsaw and Springer-Verlag Wien. Source

Gurkovskiy B.V.,National Research Nuclear University MEPhI | Miroshnichenko V.P.,National Research Nuclear University MEPhI | Onishchenko E.M.,National Research Nuclear University MEPhI | Simakov A.B.,National Research Nuclear University MEPhI | Streil T.G.,SARAD GmbH
Journal of Environmental Radioactivity | Year: 2015

Negatively charged ions from the alpha particle tracks are detected by the discharge wire counter opened to the air. Ion clusters are transferred from the particle tracks to the detector volume by an air flux. It allows a remote detection of very low concentrations of alpha particles. In contrast to the existing long-range alpha particle detection technique this method employs a detector working in a counting mode using a gas discharge method with an open-air proportional counter that provides sharp selectivity and accuracy of measurements. The device allows to detect alpha contamination over large surface areas, including places hard to reach, using different nozzles such as the tube nozzle or disc nozzle. The basic parameters of the device are: detection distance - 0.5m; time of detection - 10s; the sensitivity per unit area - 0.05Bq/cm2. Also the auto-calibration technique and results are presented. That allows using the device under different ambient conditions by making an automatic recalibration. © 2015 Elsevier Ltd. Source

Vaupotic J.,Jozef Stefan Institute | Streil T.,SARAD GmbH | Tokonami S.,Hirosaki University | Zunic Z.S.,Vinca Institute of Nuclear Sciences
Radiation Protection Dosimetry | Year: 2013

In Niška Banja, a spa town in a radon-prone area in southern Serbia, radon (222Rn) and thoron (220Rn) activity concentrations were measured continuously for one day in indoor air of 10 dwellings with a SARAD RTM 2010-2 Radon/Thoron Monitor, and equilibrium factor between radon and its decay products and the fraction of unattached radon decay products with a SARAD EQF 3020-2 Equilibrium Factor Monitor. Radon concentration in winter time ranged from 26 to 73 100 Bq m-3 and that of thoron, from 10 to 8650 Bq m-3. In the same period, equilibrium factor and the unattached fraction varied in the range of 0.08 to 0.90 and 0.01 to 0.27, respectively. One-day effective doses were calculated and were in winter conditions from 4 to 2599 μSv d-1 for radon and from 0.2 to 73 μSv d-1 for thoron. © The Author 2013. Published by Oxford University Press. All rights reserved. Source

Yuce G.,Eskiehir Osmangazi University | Ugurluoglu D.Y.,Eskiehir Osmangazi University | Adar N.,Eskiehir Osmangazi University | Yalcin T.,Technical University of Istanbul | And 3 more authors.
Applied Geochemistry | Year: 2010

The objective of this study was to investigate the geochemical and hydrogeological effects of earthquakes on fluids in aquifers, particularly in a seismically active area such as Eskisehir (Turkey) where the Thrace-Eskisehir Fault Zone stretches over the region. The study area is also close to the North Anatolian Fault Zone generating devastating earthquakes such as the ones experienced in 1999, reactivating the Thrace-Eskisehir Fault. In the studied area, Rn and CO2 gas concentrations, redox potential, electrical conductivity, pH, water level, water temperature, and the climatic parameters were continuously measured in five stations for about a year. Based on the gathered data from the stations, some ambiguous anomalies in geochemical parameters and Rn concentration of groundwater were observed as precursors several days prior to an earthquake. According to the mid-term observations of this study, well-water level changes were found to be a good indicator for seismic estimations in the area, as it comprises naturally filtered anomalies reflecting only the changes due to earthquakes. Also, the results obtained from this study suggest that both the changes in well-water level and gas-water chemistry need to be interpretated together for more accurate estimations. Valid for the studied area, it can be said that shallow earthquakes with epicentral distances of <30 km from the observation stations have more influence on hydrochemical parameters of groundwater and well-water level changes. Although some hydrochemical anomalies were observed in the area, it requires further observations in order to be able to identify them as precursors. © 2010 Elsevier Ltd. All rights reserved. Source

Streil T.,SARAD GmbH | Oeser V.,SARAD GmbH
NATO Science for Peace and Security Series B: Physics and Biophysics | Year: 2015

As part of an environmental, accidental or terroristic action remediation plan to be applied to areas affected by past activities, accidents or terroristic attacks, characterization of the site is a mandatory step. This activity will determine the extent of the contamination, contaminants’ distribution, etc. Traditionally, this activity involves the collection of different environmental samples and laboratory analysis of the relevant radio nuclides (and eventually other contaminants like heavy metals). When the results are available they are interpreted and then a decision is made. This process is normally very expensive and time consuming. In recent years many techniques have been made available for in-situ measurement that can provide reliable information on the contamination profile in radiological contaminated land. Such measurements tend to be less expensive, faster and with the aid of GPS/GIS systems decisions can be made on-site in real time. To overcome this situation we developed the DACM (Data Acquisition and Control Module) technology. Instruments based on this technology can be modified anytime by the user without special knowledge and the claiming of the manufacturer. The DACM based offers a set of components which can be configured, parameterized and controlled with respect to the requirements on site. Typical components are signal inputs for sensors like Co2,Methane, So2.., control outputs for instance for pumps, magnetic valves but also complex functional blocks like spectrometers, GPS receiver, PID regulators etc. A complex sampling schedule can be created within few minutes by a graphical software interface. One version of this system is the NucScout as a handy and robust 2″×2″(optional 3″×3″) NaI(TI) Nuclide Identifier and quantifier. With less than 2 kg including GPS and ZigBee wireless connection, if the device is operated in inaccessible or contaminated areas, he can be so calibrated by use in 1 m high from the soil, that he show direct the nuclide activity in Bq/kg. So you can get with a time resolution of 10 s and a speed of 1 m/s a local resolution of 10 m and you can detect a specific activity less than 200 Bq/kg soil activity on the surface. The NaI(TI) detector is also used to analyze food and material probes regarding specific nuclides (e.g. Iodine, Caesium, Americium). By means of the gamma spectrum, the net activity of six user definable nuclides is automatically calculated. A version with a aerosol sampling head with its spectroscopy filter and its silicon detector samples continuously and detects even small quantities of aerosol carried radioactivity. Both alpha and beta radiation are measured. The spectrometric analysis allows e.g. detecting Plutonium aerosols which cannot be detected by measuring gamma radiation. Optionally, the DACMcan be connected to a portable vacuum chamber with Ionimplanted Silicon detector up to 2,000 mm2, to allow on-site analysis of mop tests and other samples under circumstances similar to those prevailing in a laboratory. The employed vacuum pumps can be connected to a 12 V source (car battery). All detectors can be operated simultaneously. The concept of the system allows an easy handling and a standardized data basis. © Springer Science+Business Media Dordrecht 2015. Source

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