Speaker
Mr
Tomasz Mróz
(Pedagogical University in Cracow)
Description
Eleven dust mask were obtained from tourists visiting Pripyat city (northern Ukraine) by one day in July 2016. For determination of 137Cs, masks were placed in marinelli beaker and 137Cs (661.65 keV gamma line) was measured directly using HPGe detector (Ortec GMX30 series). After gamma-ray measurements, masks were placed in oven and combusted. Ash after combustion was dissolved in concentrated nitric acid. Actinides (238,239+240Pu, 241Am, 244Cm) and 90Sr were extracted from sample matrix using ion exchange chromatography with Dowex 1x8, TEVA and Sr-Resin ion exchange resins. For measurements of 238,239+240Pu, 241Am and 244Cm activities, alpha spectrometry sources were prepared by microcoprecipitation with NdF3 and were measured using silicon alpha particle detectors (Canberra P.I.P.S). For 90Sr determination, sample was mixed with scintillating cocktail and measured on LSC spectrometer (Wallac).
Our measurements showed, that during visiting Pripyat city, tourist are inhaling radionuclides, which can be easily detected using low background radioanalytical methods. Obtained results were expressed by Bq per gram of aerosols deposited on filtrating material:
0.295 ± 0.027 Bq g-1 239+240Pu
0.103 ± 0.011 Bq g-1 238Pu
0.395 ± 0.043 Bq g-1 241Am
0.037 ± 0.006 Bq g-1 244Cm
4.40 ± 0.36 Bq g-1 90Sr
11.6 ± 0.9 Bq g-1 137Cs
Primary author
Mr
Tomasz Mróz
(Pedagogical University in Cracow)
Co-authors
Prof.
Andrzej Kornaś
(Pedagogical University in Cracow)
Prof.
Jerzy Wojciech Mietelski
(The Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences)
Dr
Kamil Brudecki
(The Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences)
Dr
Paweł Janowski
(AGH Univeristy of Science and Technology)
