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The radiochemistry cyclotron in University of Helsinki

100%

Helariutta K. , Hakanen M. , Solin O.

tom Vol. 48,suppl.2

173-174

The 10 MeV proton cyclotron in the Laboratory of Radiochemistry, University of Helsinki is presented. Recent activities as well as the future research and teaching directions around the cyclotron are discussed.

Trends in radiochemistry at the beginning of the 21st century

88%

Narbutt J.

2005

tom Vol. 50,suppl.3

77-81

A review on selected - the most important and most prospective - directions of the present-day radiochemistry has been presented, with a special emphasis on the research carried out at the Department of Radiochemistry, Institute of Nuclear Chemistry and Technology.

Production of 18F by proton irradiation of C6H6NF and C6H5NF2

75%

Běták E. , Mikołajczak R. , Staniszewska J. , Mikołajewski S. , Rurarz E. , Wojtkowska J.

tom Vol. 56, No. 4

269-276

Fluorin--18 can be produced directly by the (p,pn) reaction and also indirectly by the (p,2n) reaction on the 19F target. The overall cross section for both routes is 108 plus or minus 20 mb at 22.5 plus or minus 2.5 MeV. In this work, we obtained 18F, using 25 MeV protons on 2\--fluoroaniline and 2,4-difluoroaniline targets. The chemical separation yield was 46 š 7% and 47 plus or minus 12% for 2-fluoroaniline and 2,4-difluoroaniline, respectively. Low-current 1 h irradiations led to 90 mi Ci of 18F produced from 2-fluoroaniline bombarded with a 70 nA beam (in good agreement with the theoretical value, 96 mi Ci) and to 76 mi Ci of 18F in case of 2,4-difluoroaniline and a 33 nA beam (prediction 85 mi Ci). Both values are close to the thick target result reported by Dmitriev and Molin [4] for 22 MeV protons.

Chemistry for the nuclear energy of the future

63%

Chmielewski A. G.

tom Vol. 56, No. 3

241-249

Chemistry - radiochemistry, radiation chemistry and nuclear chemical engineering play a very important role in the nuclear power development. Even at present, the offered technology is well developed, but still several improvements are needed and proposed. These developments concern all stages of the technology; front end, reactor operation (coolant chemistry and installation components decontamination, noble gas release control), back end of fuel cycle, etc. Chemistry for a partitioning and a transmutation is a new challenge for the chemists and chemical engineers. The IVth generation of nuclear reactors cannot be developed without chemical solutions for fuel fabrication, radiation-coolants interaction phenomena understanding and spent fuel/waste treatment technologies elaboration. Radiochemical analytical methods are fundamental for radioecological monitoring of radioisotopes of natural and anthropological origin. This paper addresses just a few subjects and is not a detailed overview of the field, however it illustrates a role of chemistry for a safe and economical nuclear power development.

Gdańska radiochemia, radioekologia i analiza radiochemiczna

63%

Skwarzec B.

tom nr 1

52--54

W artykule przedstawiono historię oraz stan obecny rozwoju radiochemii, radioekologii oraz analizy radiochemicznej na Pomorzu Gdańskim. Szczególną uwagę poświecono badaniom naukowym realizowanym na Wydziale Chemii Uniwersytetu Gdańskiego.

Transect survey of artificial 137Cs and natural 40K in moss and bilberry leaf samples from two main valleys from Tatra National Park

51%

Kubica B. , Skiba S. , Mietelski J. W. , Golas J. , Kubica M. , Stobinski M. , Tuteja-Krysa M. , Tomankiewicz E. , Gaca P. , Krzan Z.

2004

tom 13

nr 2

This paper presents the results of determination of artificial 137Cs and natural 40K activity concentrations in plants (bilberry (Vaccinium myrtillus) and moss (Polytrichum commune)) and in soil samples from two main Tatra Valleys; Kościeliska and Rybi Potok Valley. The data were obtained during two years (2001- 02). These plants are known a as good bio-monitors for radioceasium [1,2 ]. It is known that 137Cs and 40K isotopes play important roles in the environment, due to their good assimilation by plants. The transfer of these elements from soil to plant depends of many factors: type of soil, organic matter contents, pH, type of plants. In this paper some results concerning the transfer of 137 Cs and 40K isotopes from various types of Tatra soil to moss or bilberry are shown.