RESUMO
The autoradiographic micromapping of rocks with various U and Th contents has been performed by means of CR-39 solid-state nuclear track detector (SSNTD). The optical track density was found to be highly correlated (r=0.92) with total alpha emitters activity calculated on the basis of field gamma spectrometric measurements of rock outcrops. The method was tested not only for the wide range activities of alpha emitters but various types of surface distribution (including highly radioactive mineral grains) as well.
Assuntos
Partículas alfa , Polietilenoglicóis/análise , Poluentes Radioativos do Solo/análise , Autorradiografia , Calibragem , Microquímica , Quartzo/química , Monitoramento de Radiação/métodos , RadiometriaRESUMO
1. In human blood incubated in vitro, the transfer of free cholesterol and lecithin from erythrocytes to serum was not related to glycolytic activity in erythrocytes or esterification of cholesterol in serum. 2. The stability of free cholesterol concentration in serum was dependent on the activity of lecithin:cholesterol acyltransferase (EC 2.3.1.43), and the stability of lecithin concentration in erythrocytes, on glycolytic activity.
