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Introduction
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January 1992 - August 1995
Publications
Publications (58)
Radiation protection on construction sites of old mining is demanding because of the high radon potential of the mines, natural density driven mine air current through the galleries and the ramifications of galleries. Monitoring of the underground workplaces consist of the two pillar "operational radon measurements" and "personal dosimetry". Howeve...
Radiation protection on construction sites of old mining is demanding because of the high radon potential of the mines, natural density driven mine air current through the galleries and the ramifications of galleries. Monitoring of the underground workplaces consist of the two pillar "operational radon measurements" and "personal dosimetry". Howeve...
On average, about 270 miners of eight enterprises work on the elimination of mining damages, potential hazards and maintenance of drainage systems in Saxony. Radiation protection on construction sites of old mining is demanding because of the high radon potential of the mines, natural density driven mine air current through the galleries and the ra...
On average, about 270 miners of eight enterprises work on the elimination of mining damages, potential hazards and maintenance of drainage systems in Saxony. Radiation protection on construction sites of old mining is demanding because of the high radon potential of the mines, natural density driven mine air current through the galleries and the ra...
THORON-SCOUT is a stand-alone diffusion based active Radon and Thoron monitor for long term indoor measurements to evaluate the human health risk due to activity concentration in the breathing air. Alpha-particle spectroscopy of Po isotopes, being the progeny of the decay of the radioactive noble gas Radon, is applied to separately monitor activity...
Sources and sinks of methane (CH4) are critical for understanding global biogeochemical cycles and their role in climate change. A growing number of studies have reported that CH4 concentrations in cave ecosystems are depleted, leading to the notion that these subterranean environments may act as sinks for atmospheric CH4. Recently, it was hypothes...
Understanding the sources and sinks of methane (CH4) is critical for predicting and managing global biogeochemical cycles. Recent studies have reported that CH4 concentrations in cave ecosystems are depleted and that these subterranean environments may act as a daily sinks for atmospheric CH4. It has been hypothesized that this CH4 depletion may be...
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...
Currently there are only very expensive and time-consuming analytical methods for the determination of uranium in water such as the ICP-MS, which is solely useable in laboratories. Novel measurement systems based on biochemical reactions, which are made visible with the help of gold nanoparticles by color changing or fluorescence, shall represent a...
The reliable detection and assessment of potential CO2 leakages from storage formations require the application of assurance monitoring tools at different spatial scales. Such tools also play an important role in helping to establish a risk assessment strategy at carbon dioxide capture and storage (CCS) facilities. Within the framework of the MONAC...
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 th...
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 produc...
Radon (Rn) is a chemically inert radioactive gas, formed by the natural radioactive decay
of Uranium (U) in rock, soil, and water. Naturally existing, low levels of U occur widely in
Earth's crust. Radon is the main responsible for the public exposure to natural ionizing
radiations. Constant exposure to high concentration of radon gas may cause lun...
Radon (Rn) is a chemically inert radioactive gas, formed by the natural radioactive decay
of Uranium (U) in rock, soil, and water. Naturally existing, low levels of U occur widely in
Earth's crust. Radon is the main responsible for the public exposure to natural ionizing
radiations. Constant exposure to high concentration of radon gas may cause lun...
Radon (Rn) is a chemically inert radioactive gas, formed by the natural radioactive decay
of Uranium (U) in rock, soil, and water. Naturally existing, low levels of U occur widely in
Earth's crust. Radon is the main responsible for the public exposure to natural ionizing
radiations. Constant exposure to high concentration of radon gas may cause lun...
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 t...
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 e...
To measure Radon and Thorn simultaneously is only possible using the Alpha spectrometry. Pulse ionisation chambers are not
very use full because of the bad energy resolution. The only effective method for a sufficient energy resolution is the charge
collection of the Radon/Thoron daughters on the surface of a Semiconductor detector. But till now al...
MyRIAM is the acronym for My Radioactivity In Air Monitor and points out that the device was designed for personal use to detect any radioactivity in the air at the place and at the moment of danger. The active air sampling process enables a detection limit several orders of magnitude below that of Gamma detectors. Therefore, it is the unique way t...
MyRIAM is the acronym for My Radioactivity In Air Monitor and points out that the device was designed for personal use to
detect any radioactivity in the air at the place and at the moment of danger. The active air sampling process enables a detection
limit several orders of magnitude below that of Gamma detectors. Therefore, it is the unique way t...
To measure precise longtime data from geochemical parameters for studies of deep fluid streams in volcanic areas, hydro geological
studies and reservoir management in geothermal fields robust and high reliable measuring systems are necessary.
MyRIAM is the acronym for My Radioactivity In Air Monitor, designed for personal use to detect any radioactivity in the air at the place and at the moment of the danger. The active air sampling process enables a detection limit several orders of magnitude below that of Gamma detectors. Therefore, it is the unique way to detect dangerous exposures i...
Nowadays, miniaturized microprocessors enable the design of most power saving instruments with the entire performance of state-of-the-art active devices in the size of a cell phone: a new generation of instruments equipped with nuclide separation within an HV-measurement chamber, internal circular buffer, temperature and humidity sensor will be int...
As part of the activities to have a radon calibrated laboratory in Mexico, a DOSEman, an Alpha GUARD and a Germanium detector were used to measure the radon concentration of a radon source chamber. The two first detectors were also used to determine the radon concentration in the laboratory during normal operation of the chamber and under a control...
The approach to earthquake prediction by geophysical, geochemical and hydrological data needs real time measuring equipment and modelling of statistical data. A progress in this field is presented in this paper by the developing of a new versatile measuring system EPOS (Earthquake Precursor Observation System) based on experiences and recent result...
An electronic radon dosimeter based on deposition of radon decay products on a semiconductor detector coupled with an alpha spectroscopy offers some advantages compared to passive dosimeters. The dose value and the radon concentration is calculated and displayed online during the exposure time and preestablished dose limits can be watched by an ale...
A high dynamic range (HDR) CMOS image sensor architecture based on
spiking pixel cells and its first implementation, a linear 128-pixel
sensor, is presented. The pulse rate of the pixel cell is proportional
to the local light intensity. The pixel cell features a pixel-level
analog-to-digital (A/D) conversion by pulse counting. It allows one to
trad...
We report on the influence of the working conditions on the dose estimation. Especially the equilibrium factor and the unattached fraction are influenced by the working conditions. For instance in a cabinet-maker's shop the radon concentration is strongly influenced by the ventilation system. The factor F is influenced by dust-producing work proces...
A microsystem for measuring alpha radiation and processing radiation dose is presented. The radiation sensor is built on a PIN diode. The measurement results are transmitted wirelessly to a host computer. Under defined measurement conditions the peak spectrum of the radiation can be exactly calculated. In real-world environments sources of alpha ra...
Characterization is made of a novel radiation sensor which is sensitive to alpha particles and protons, using computer codes and analytical models. The sensor cell consists of a p-channel transistor in a floating n-well. Cylindrically symmetric three-dimensional calculations based on the whole set of semiconductor equations are carried out in order...
We report on the development of low cost alpha particle sensor systems for radon-and radon daughter monitoring and dosimetry (Ealpha = 5.5…7.9 MeV) and on the first application for environmental surveys.
We report on the development of low-cost alpha-particle sensor systems for radon and radon daughter monitoring and dosimetry (Ealpha= 5.5–7.9 MeV) and on the first application for environmental surveys. It is known that commercial dRAM cells are sensitive to alpha particles, but their efficiency is at most 20%, resulting in an unstable operating ra...
Spektrometrischer Strahlensensor in CMOS-Technologie für die Umweltüberwachung
Es wird über die Entwicklung preiswerter Silizium-Mikrosysteme berichtet, die für die Dosimetrie und den Strahlenschutz eingesetzt werden können. Die Mikrosysteme wurden in verschiedenen Strahlungsfeldern, wie Neutronen-, Protonen-, Alpha-, Beta- und Gammastrahlung, getestet. Dabei zeigte sich, daß neben dem Radonnachweis noch weitere Anwendungen i...
The reliability of narrow aluminium-based metal lines has become an essential factor in very large scale integration integrated circuits (VLSI ICs). After theoretical considerations, a new developed experimental procedure is presented. This so-called cold deposition with immediate in-situ annealing leads to a modified metal system of high reliabili...
The structure of excited states in 28Si as well as the energy dependence of the reaction mechanism are investigated. Angular distributions related to the 01+, 21+, 41+, 02+, 31+, 22+ + 23+, 31- + 42+ levels in the 28Si(n, n') reaction were measured at incident energies 6.8, 7.0, 8.0 ... 12.0 MeV. The analysis was extended up to 14.8 MeV bombarding...
The electret ionisation chamber was utilised to register � radiation from tritium contaminated air. The parallel plate chamber with inter-electrode spacing distance ranging from 0.2 to 3.0 cm contains a negatively corona-charged PTFE electret of surface potentials up to 2 kV. Calculations of the electric field within the air-filled chamber volume s...
Neutron scattering on 24Mg, 28Si and 32S was studied in the incident energy range from 7 to 14 MeV. In the experiment natural samples and the time-of-flight technique were used. The theoretical analysis was extended including other experiments to bombarding energies around 14 MeV. The excitation of the first 2+ levels shows for these nuclei, despit...
The main features in the behavior of the functions for excitation of low-lying nuclear levels by neutrons are analyzed and the connection between these features and the parameters of the optical and statistical models used to describe them is discussed. The differences between the dynamical-deformation parameters of nuclei derived from direct inela...
Spectra and angular distributions of neutrons from the reactions 94Zr(p,n)94Nb, 119Sn(p,n)119Sb, and 122Sn(p,n)122Sb have been measured for proton energies 6--9 MeV with a 1-MeV step in the range of angles from 30 to 150 deg. The measurements were made by the time-of-flight method. The results show that in the integrated spectra there is a contribu...
Spectra are measured for neutrons from decay of isobaric analog resonances in the reactions /sup 109/Ag(p,n)/sup 109/Cd and /sup 115/In(p,n)/sup 115/Sn. Resonances were studied at proton energies E/sub IAR/=6.665 MeV and 6.965 MeV, corresponding to excitation of analog states in the /sup 110/Cd nucleus, and also at proton energies E/sub IAR/= 6.92...
Spectra are measured for neutrons from decay of isobaric analog resonances in the reactions 109Ag(p,n)109Cd and 115In(p,n)115Sn. Resonances were studied at proton energies EIAR = 6.665 MeV and 6.965 MeV, corresponding to excitation of analog states in the 110Cd nucleus, and also at proton energies EIAR = 6.92 MeV and 7.43 MeV corresponding to analo...
High radon concentration in work and living places are caused by a high geological radon potential of the soil, by technological processes, the use of building materials with high uranium, thorium and radium content and the building construction. Further the influence of the working and living conditions on the dose estimation is very important. Es...
We report on a new handheld alpha/beta spectroscopy system. This powerful analysis tool consists of an integrated detector head (detector/preamplifier/shaping), MCA-unit and the universal control terminal. A very important application of this new measuring system is the nuclidspecific surface contamination monitoring. During the decommissioning pro...
The radiological assessment of the results of radon measurements in dwellings is not automatically ap-plicable to workplaces, due to different forms of utilisation, constructional conditions, time of exposure, heating and ventilation conditions, additional aerosol sources, aerosol parameters, chemical substances, etc. In order to investigate the pe...
Projects
Projects (4)
The project deals (1) with stories of underground inspections to share the experiences with authorities and miners and (2) with new developments to improve the underground radiation protection.
To example a new Quick-Erect Stopping System (QESS) for miners was developed to reduce the radon exposures of miners at small construction sites of old mining in the future.
Our project asks how methane behaves in karst landscapes. We are seeking to determine the sources and sinks of methane in these landscapes.
