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[en] A mathematical model is given to describe the metabolism of the 210Po introduced into the systemic compartiments of the human body. The model has been based on the experimental data referred to the 210Pb-210Po intake, excretion and body burden of members of the general italian population. The model fits also very well the experimental data of 210Pb-210Po intake and excretion reported by other authors. The retention function of 210Po in total body, soft tissue and bone has been evaluated together with the urinary excretion function and the absorbed fraction by ingestion. The model is very valuable to evaluate the lung exposure to Radon decay products on the basis of the 210Pb-210Po urinary excretions
[en] Measurement of the 214Po half-life with the DEVIS track setup at the Institute of Theoretical and Experimental Physics (ITEP, Moscow) by means of a procedure based on determining lifetimes of individual nuclei is described. The value obtained for the 214Po half-life is 163.8 ± 3.0 µs. The possibility of reaching the accuracy of the measurements that is required for testing the statement that the decay of some nuclei has a nonexponential character and the source intensity necessary for this are discussed.
[en] Particulate contamination during the manufacturing process has always been a major problem for the semiconductor industry. Since there is an inverse correlation between the particle count in the air and the product yield, manufactures invest large sums in clean room facilities. Yet, despite such techniques as filtered air circulated by laminar flow, many particles remain. The two basic methods of ionization, electrical and nuclear powered ionization, might be a possible solution. The heart of the nuclear ioniser is a small cartridge of Polonium-210
[en] Results: of the analysis of a time series of values of the half-life (τ) of the 214Po nucleus with a different time step obtained from the TAU-1 (354 days) and TAU-2 (973 days) installations are presented. The annual variation with an amplitude of (9.8 ± 0.6) × 10−4 and daily variations in the solar, lunar, and sidereal times with amplitudes of (5.3 ± 0.3) × 10−4, (6.9 ± 2.0) × 10−4, and (7.2 ± 1.2) × 10−4, respectively, are found in the series of τ values. It is shown that variations in microclimatic parameters cannot be a cause of τ variations.