ABSTRACT
The Institute of Nuclear Chemistry and Technology (INCT) procedure for preparation of water samples for proficiency testing on determination of (241)Am, (137)Cs, (239)Pu, (226)Ra and (90)Sr in water is presented. Natural waters were applied as the raw materials and spiked with the aforementioned radionuclides. The procedure of spiking water allows to prevent losses of the radionuclides and to assign property values from formulation. The main advantages of this procedure are (i) similarity of the test materials to the water samples routinely analysed by radioanalytical laboratories, and (ii) traceable assigned values with low uncertainties.
ABSTRACT
BACKGROUND: During the 1980s, at a time that life expectancy at birth in western Europe has increased by 2.5 years, it has stagnated or, for some groups, declined in the former socialist countries of central and eastern Europe. METHODS: A study was carried out to ascertain the contribution of deaths at different age groups and from different causes to changes in life expectancy at birth in Czechoslovakia, Hungary and Poland between 1979 and 1990. RESULTS: Improvements in infant mortality have been counteracted by deteriorating death rates among young and middle-aged people, with the deterioration commencing as young as late childhood in Hungary but in the thirties or forties in Czechoslovakia and Poland. The leading contributors to this deterioration are cancer and circulatory disease but, in Hungary, cirrhosis and accidents have also been of great importance. CONCLUSIONS: The patterns observed in each country differ in the age groups affected and the causes of death. Further work is required to explain these differences.
