RESUMO
59 hot particles were collected in Kiev, Ukraine, in 1987. All but one were prepared from a moss carpet of 360 cm2 area. Radionuclide composition of the hot particles was investigated by gamma-spectrometry and beta absorption method. Pure beta emitters 90Sr and 147Pm were determined in 25 hot particles measuring the beta absorption curves of the hot particles with an end-window Geiger-Müller counter and decomposing the curves in order to obtain the contributions of 90Sr and 147Pm to the total beta counting rate. All but one of the hot particles were found to be the debris of the fuel. The activity ratio 90Sr:l44Ce was 0.052 in good agreement with theoretical calculations on core inventories. This means that strontium behaved as a nonvolatile element in the process of the formation of the hot particles investigated. The activity ratio 147Pm:144Ce was 0.078 which is half of the theoretical result. Although 147Pm is considered to be a refractory nuclide, it seems that significant part of 147Pm went to the homogeneous fraction of the general fallout. The surface density of hot particles (of higher than about 50 Bq activity) was about 1,600 m(-2) and that of the activities of the nuclides 90Sr, 106Ru, 134Cs, 137Cs, 144Ce and 147Pm as components of hot particles was 12.2, 54.3, 5.9, 9.7, 234 and 18.3 kBq m(-2) (activity values counted for 26 April 1986), respectively, in downtown Kiev city in 1987.
Assuntos
Partículas beta , Raios gama , Promécio/análise , Monitoramento de Radiação/métodos , Cinza Radioativa/análise , Liberação Nociva de Radioativos , Radioisótopos de Estrôncio/análise , Radioisótopos de Cério/análise , Radioisótopos de Césio/análise , Monitoramento de Radiação/instrumentação , Radioisótopos de Rutênio/análise , Contagem de Cintilação , Ucrânia , Saúde da População UrbanaAssuntos
Acidentes , Radioisótopos de Césio/análise , Reatores Nucleares , Plantas/química , Cinza Radioativa , Geografia , Hungria , UcrâniaRESUMO
Three cases of severe accidental poisoning with "Reasec" in infants and young children are reported. Patients' medical history, the clinical features and ways of antidote administration are described. In severe poisoning in addition to symptomatic intensive care administration of "Narcanti" in continuous infusion is recommended. The necessity of strict observation and ventilation facilities because of the potential respiratory failure is emphasised.
