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Radiation doses to technologists working with 18F-FDG in a PET center with high patient capacity

Demir M., Demir B., Yaşar D., Sayman H. B., Halac M., Ahmed A. S., Özcan K., Uslu I.

Nukleonika

2010

Vol. 55, No. 1

107-112

The increasing numbers of PET studies for routine diagnosis creates a real hazard to radiation workers. The aim of this study is to estimate the annual whole-body and finger radiation dose to technologists working with 18F-FDG in a PET center with high patient potential. In our PET center, the number of PET imaging has increased almost to 5000 studies per year. Our standard dose for tumor imaging is 518 MBq of 18F-FDG. Five technologists performing all steps of 18F-FDG imaging (5 patients per technologist in a day) were officially involved round the week for handling and injecting 18F-FDG to patients. Whole-body and finger dose measurements with TLDs were performed for two different time periods: i) before shielding precautions during the first 6 months (without a shielding for sterile syringe and without a lead container for shielded syringe) and ii) after shielding precautions during the next 6 months (with a shielding for sterile syringe and with a lead container for shielded syringe). The average annual whole-body radiation dose for one technologist before shielding precautions was 7.82 mSv and after shielding precautions was 5.76 mSv. On the other hand, while the average annual finger radiation doses for one technologist before shielding precautions were 210.36 and 293.72 mSv for the left and right hand, after shielding precautions were they 158.16 and 217.58 mSv for the left and right hand, respectively. According to our results, if one technologist performs the whole-body PET imaging of 5 patients per day, the annual radiation dose to this technologist will not exceed the recommended limits by ICRP.

Investigations on the applicability of chemically deposited Ni-shell tools for deep-drawing processes

Hufenbach W., Jaschinski J., Gattwald R., Behrens B. A., Demir M.

Archives of Civil and Mechanical Engineering

2009

Vol. 9, no 1

61-68

The paper introduces the results of an EFB (European Research Association for Sheet Metal Working) research project concerning the applicability of tools made of chemically deposited nickel shells with polymer supports for small and medium scale deep drawing production. Several investigations of the material behaviour and tribological response of the chemically deposited nickel shells were performed together with numerical analyses of the deep-drawing process in order to optimize the tools under the consideration of the specific characteristics of the nickel shell and the polymer support structure. Finally, an optimized tool prototype has been manufactured and tested in order to verify the design solutions under service conditions.

Artykuł przedstawia rezultaty badań EFB (European Research Association for Sheet Metal Working) projektu dotyczącego przydatności narzędzi wykonanych poprzez nanoszenie chemicznie powłok niklu na polimerowe obudowy dla małej i średniej produkcji wyrobów tłoczonych. Przeprowadzono wiele badań parametrów trybologicznych nanoszonych chemicznie powłok niklowych razem z analizą numeryczną procesu głębokiego ciągnienia, w celu zoptymalizowania narzędzi pod kątem określonych cech powłoki niklowej i polimerowej obudowy. W rezultacie stworzono zoptymalizowany prototyp narzędzia, który został przetestowany w warunkach serwisowych, w celu sprawdzenia prawidłowości zastosowanych rozwiązań.