A. Scharmann
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View article: The Role of Singlet Oxygen in the Lyoluminescence of Saccharides
The Role of Singlet Oxygen in the Lyoluminescence of Saccharides Open
Lyoluminescence, the radiation induced light emission during the dissolution of irradiated solid substances like alkali halides, saccharides, amino acids etc. was proposed as a method of dosimetry. It is established that lyoluminescence is…
View article: Dose Re-Assessment TSEE Measurements with BeO Thin-Film Detectors
Dose Re-Assessment TSEE Measurements with BeO Thin-Film Detectors Open
The exposure of BeO thin-film TSEE detectors to UV light induced a photo-transfer (PT) of electrons from deep traps to shallow dosimetry traps, emptied by a primary TSEE readout. Thus additional PT-TSEE readouts are allowed. By this techni…
View article: Keynote Paper on Exoelectron Emission Research
Keynote Paper on Exoelectron Emission Research Open
A survey of the exoelectron research that took place during the last 30 years, important results, potential applications and fundametal problems are given.
View article: TL Signals from BeO Thin-Film TSEE Dosemeters
TL Signals from BeO Thin-Film TSEE Dosemeters Open
Radiation-induced thermoluminescence (TL) was observed from BeO thin-film detectors developed recently for exoelectron (TSEE) dosimetry. For soft X-rays, the low-dose threshold was found at about 5 mGy. The linear dose range is extended ov…
View article: Parameters Affecting the TSEE of BeO Dosemeters
Parameters Affecting the TSEE of BeO Dosemeters Open
BeO has been used for TSEE dosemeters over two decades. Its exoelectron properties are not uniform. The paper reviews bulk and surface properties of importance for exoelectron emission and dosimetric applications.
View article: Connected TSEE/OSEE Readouts of BeO Thin-Film Dosemeters
Connected TSEE/OSEE Readouts of BeO Thin-Film Dosemeters Open
The commonly used TSEE readout for β- or X-irradiated BeO thinfilm dosemeters was complemented by OSEE readouts using blue (500 nm) light beams which caused different OSEE decay characteristics. By TSEE a dose range between 10 -5 Gy and 10…
View article: Identification of Thermoluminescence Traps in CaWO<sub>4</sub> and BaWO<sub>4</sub> by EPR Measurements
Identification of Thermoluminescence Traps in CaWO<sub>4</sub> and BaWO<sub>4</sub> by EPR Measurements Open
In calcium-and barium tungstate crystals both containing molybdenum and phosphorus, paramagnetic centres are created by X-ray irradiation at room temperature. Two kinds of centres are identified by EPR measurements; an electron trapped at…
View article: Dipole Centres in Rare-Earth-Doped CaF<sub>2</sub>
Dipole Centres in Rare-Earth-Doped CaF<sub>2</sub> Open
The reorientation of dipole centres in CaF 2 : RE 3+ (RE: Gd, Tb, Lu) is investigated by the method of ionic thermocurrent (ITC). ITC peaks below 200 K are caused by reorientation of RE 3+ -F - -complexes and related dipole centres, wherea…
View article: Reversible Creation and Annihilation of a Violet Fluorescence Band in Doped ZnS Crystals
Reversible Creation and Annihilation of a Violet Fluorescence Band in Doped ZnS Crystals Open
Annealing of doped (Cu, Ag, Au) ZnS crystals at 1200 °C and subsequent quenching or slow cooling, respectively, create or annihilate a violet fluorescence band, reversibly. The experimental results indicate that the emission must be due to…
View article: Der Einfluß der Elektronenaffinität auf die optisch stimulierte Exoelektronenemission von KCl / Influence of the Electron Affinity on the Optically Stimulated Exoelectron Emission (OSEE) of KCl
Der Einfluß der Elektronenaffinität auf die optisch stimulierte Exoelektronenemission von KCl / Influence of the Electron Affinity on the Optically Stimulated Exoelectron Emission (OSEE) of KCl Open
The OSEE of KCl single crystals due to optical bleaching of F-centers created by electron bombardment has been investigated under various vacuum conditions. Its decay and intensity revealed a strong dependence on the residual gas pressure …
View article: Photolumineszenz und Radiothermolumineszenz an CaWO4 - und CaWO<sub>4</sub> :Pb-Einkristallen / Photoluminescence and Radiothermoluminescence of CaWO<sub>4</sub>- and CaWO<sub>4</sub>: Pb single crystals
Photolumineszenz und Radiothermolumineszenz an CaWO4 - und CaWO<sub>4</sub> :Pb-Einkristallen / Photoluminescence and Radiothermoluminescence of CaWO<sub>4</sub>- and CaWO<sub>4</sub>: Pb single crystals Open
Luminescence spectra, absorption spectra, thermoluminescence, and thermally stimulated conductivity after irradiation with X-rays of CaWO 4 - and CaWO 4 : Pb single crystals were investigated in the temperature range from 4,2 to 300 K. The…
View article: Notizen:Sensibilisierung von Radiophotolumineszenz- gläsern / Sensitizing of Radiophotoluminescence Glasses
Notizen:Sensibilisierung von Radiophotolumineszenz- gläsern / Sensitizing of Radiophotoluminescence Glasses Open
The sensitizing of silveractivated radiophotoluminescence glasses in dependence on doping ions has been studied. The greatest increase in sensitivity is shown by addition of TiO 2 .
View article: Thermoluminescence of ZnS
Thermoluminescence of ZnS Open
A number of zinc sulphide phosphors containing cobalt was prepared with various concentrations of additional impurities. Co ++ -ions in both copper and silver activated phosphors produce a characteristic glowcurve, showing three distinct p…
View article: Zum Einfluß elektrischer Felder auf den Szintillationsprozeß in CsJ/Tl
Zum Einfluß elektrischer Felder auf den Szintillationsprozeß in CsJ/Tl Open
The luminescence yield of CsJ/Tl-crystals under the influence of electric fields is investigated. At excitation with ionizing radiation the intensity depends on the incident particles and their differential energy loss. The Tl-centres are …
View article: Untersuchungen zur Lumineszenz von LiF/U<sup>6+</sup> -Einkristallen / Luminescence of LiF/U<sup>6+</sup>-crystals
Untersuchungen zur Lumineszenz von LiF/U<sup>6+</sup> -Einkristallen / Luminescence of LiF/U<sup>6+</sup>-crystals Open
Fluorescence spectra, fluorescence decay-times and excitation spectra of LiF/U 6+ -single crystals with different U-concentrations have been investigated at room temperature and at 88 °K. The results are discussed within a model for the lu…
View article: Zur Lumineszenzschädigung von ZnS/Cu
Zur Lumineszenzschädigung von ZnS/Cu Open
The resistance to radiation damage of the blue and green emission bands of ZnS/Cu is found to vary with mass, energy and dose of incident ions. The experimental results are discussed with Schön’s kinetic model and our proposed model for lu…
View article: Zum Szintillationsprozeß in CsJ/Tl
Zum Szintillationsprozeß in CsJ/Tl Open
Luminescence decay times of CsJ- and CsJ/Tl-crystals with different Tl-concentrations have been measured after excitation with UV-light-, electron- and ion-pulses. Taking the model of Bonanomi and Rossel as a basis the results are explaine…