Dosimetry for Polluted Territories
Retrospective Dosimetry for Occupation and Environmental Exposure
Tech Area / Field
- ENV-MIN/Monitoring and Instrumentation/Environment
8 Project completed
Senior Project Manager
Rudneva V Ya
Ural Research Center of Radiation Medicine, Russia, Chelyabinsk reg., Chelyabinsk
- Ural Branch of RAS / Institute of Metal Physics, Russia, Sverdlovsk reg., Ekaterinburg\nNPO Mayak, Russia, Chelyabinsk reg., Oziorsk
- Forschungszentrum für Umwelt und Gesundheit GmbH (GSF) / Institut für Strahlenschutz, Germany, Neuherberg\nDurham University, UK, Durham
Project summaryThe reconstruction of the doses received by workers and off-site population as a result of radiation accidents will necessitate the usage of adequate methods for retrospective dosimetry. Among the methods that have recently been developed the following appear to be most effective: EPR dosimetry of tooth enamel samples, analysis of stable chromosome translocations in blood cells (for the purpose of inpidual dose reconstruction) and TL dosimetry of construction ceramics specimens (for reconstruction of doses in the areas where the people lived or worked). The present study is aimed at the assessment of practicability (feasibility) of the above-listed methods under actual exposure conditions, i.e., in dose reconstruction for workers of Mayak Industrial Association (MIA) and off-site population exposed due to radioactive releases and accidents at this facility.
Application of up-to-date methods for retrospective dosimetry and biodosimetry allows to verify dose values, on the one hand, and to determine the limits of applicability and working capacity of these methods in actual practice, on the other. Moreover, reliable dose estimates added to the data of epidemiologic studies conducted at URCRM will serve as a basis for direct assessments of radiation risk under the conditions of chronic exposure and, consequently, may be useful for substantiating radiation safety standards. The participation in the project will give the specialists of MIA an opportunity to apply their expertise to the settlement of the international issues relating to protection of the environmen and radiation safety.
Thus, the distinguishing feature of the present project consists in the application of different approaches and methods to dose reconstruction for one and the same inpiduals with subsequent comparison and analysis of the results. A comparison of the results yielded by different methods will allow, in our opinion, to obtain the most reliable dose estimates and to draw a conslusion about the validity of the methods applied. The participation of German Scientists from GSF, Munich, is planning to arrange EPR, TLD and cytogenetic measurements in specific laboratories of this center as well as to evaluate the efficiency of different dosimetric methods.
The implementation of the project program will enable to achieve the following:
1) verify the dose estimates for MIA workers and off-site population exposed due to releases effected by the facility;
2) еvaluate the efficiency of the EPR, TLD and cytogenetic methods for retrospective dosimetry at late times after exposure;
3) validate the scope of sensitivity for these methods under actual measurement conditions. It is expected that the results achieved will be of considerable value in terms of fundamental and and applied science for both further development of retrospective dosimetry and subsequent risk assessment as well as the development of more objective assumptions about the effects of chronic radiation in humans.