Specific features of the influence of high-energy electron beams on the luminescent properties of undoped and Nb, Fe-doped Al₂O₃ crystals.
The influence of 10 MeV high-current electron beams accelerated by the M-30 microtron on the luminescent properties of the α-Al₂O₃, Al₂O₃:Nb and Al₂O₃:Fe crystals has been studied. The effect of the long-term phosphorescence at room temperature has been found that can be used to monitor electron and gamma accelerator beams.
Monitoring and surveillance of radio-cesium in cultivated soils and foodstuff samples in Israel 18 years after the Chernobyl disaster
Abstract The concentration of radio-cesium and radio-beryllium in foodstuff and soils samples was measured together with natural radioactivity ( 40 K and Th, U chains) in Marinelli (reentrant) beakers using γ -ray spectrometry. Radio-cesium in foodstuff and soils samples varies from 0.1 to 0.5 and from 1.5 to 20 Bq kg - 1 , respectively. The limit of detection for determination of radio-cesium was found to be 0.04 Bq (i.e. 1.1 pCi). The concentration of radio-cesium measured in dry milk powders, concentrated from composite raw, whole milk samples varies from 0.05 to 0.08 Bq kg - 1 . The level of radiation of 137 Cs measured in foodstuff samples presents no potential health hazard to the public today in any conceivable way as they are much smaller than the natural contribution.
The problems associated with the monitoring of complex workplace radiation fields at European high-energy accelerators and thermonuclear fusion facilities.
The European Commission is funding within its Sixth Framework Programme a three-year project (2005-2007) called CONRAD, COordinated Network for RAdiation Dosimetry. The organisational framework for this project is provided by the European Radiation Dosimetry Group EURADOS. One task within the CONRAD project, Work Package 6 (WP6), was to provide a report outlining research needs and research activities within Europe to develop new and improved methods and techniques for the characterisation of complex radiation fields at workplaces around high-energy accelerators, but also at the next generation of thermonuclear fusion facilities. The paper provides an overview of the report, which will be available as CERN Yellow Report.