Studies of the Behavior of Carrier-free Radioisotopes

Abstract

The effect of radioactivity on the radiocolloid formation of europium has been described. The centrifugal behavior of radioactive and of nonradioactive europium has been compared as a function of the of the solution at extremely low europium concentrations. The concentration of nonradioactive europium was determined by radioactivation analysis. No difference could be observed between the behavior of radioactive and of nonradioactive europium. The effects of the europium concentration and of other electrolytes have also been studied. Radioactivity does not seem to play an essential role in the radiocolloid formation of europium. Zusammenfassung Es wurde der Effekt der Radioaktivität auf die Formation von radiokolloidalem Europium beschrieben. Das zentrifugale Verhalten von radioaktivem und nichtaktivem Europium wurde verglichen als Funktion des PH-Wertes der Lösung bei extrem kleinen Europiumkonzentrationen. Die Konzentration des inaktiven Europiums wurde mit Hilfe der Radioaktivierungsanalyse bestimmt. Es konnte kein Unterschied zwischen radioaktivem und nichtaktivem Europium beobachtet werden. Außerdem wurden die Effekte der Europiumkonzentration und der Konzentration anderer Elektrolyte studiert. Die Radioaktivität scheint bei der Formation von radiokolloidalem Europium keine wesentliche Rolle zu spielen. RésuméOn décrit l'effet de la radioactivité sur la formation de radiocolloïde d'europium. On a comparé le comportement lors de la centrifugation d'europium actif et non actif en fonction du pa pour des solutions de concentration extrêmement faible. La concentration de l'europium inactif a été déterminée à l'aide d'analyses par activation. Il n'a pas été possible d'observer une différence entre le comportement de l'europium radioactif et inactif. Les effets de la concentration de l'europium et d'autres électrolytes ont été également étudiés. Il semble que la radioactivité ne joue pas un rôle essentiel dans la formation de l'europium radiocolloïdal.

Studies of the Behavior of Carrier-free Radioisotopes

“…The distilled water was centrifuged for an hour at 24000 rpm (60000 g) with a high-speed centrifuge (Hitachi, Model 24P), and then placed in an evacuated desiccator to remove the dissolved gases. The europium carrier, hydrochloric acid, sodium hydroxide and carrier-free solutions were prepared as has been described in the previous paper [16]. Small plates (1 cm X 1 cm X 2 mm) of Polyethylene, polypropylene, polystyrene, polycarbonate, Polyvinylchloride, acryüc resin, teflon, and acetobutyrate were used as the samples of plastics.…”

“…If this is acceptable, a further explanation is required for the remaining part of curve III, j9h < 11, from the view point of adsorption. In In the previous paper of this series [16], the behavior of europium in extreme dilute concentration was studied by centrifugation. The results of the adsorption studies of Polyethylene should be compared with those obtained by the centrifugal studies.…”

“…In the previous paper [16] of this series, the behavior of radiocolloidal europium was reported. Most of the carrier-free was precipitated by centrifuging from a Solution of pn 7.5; however, a small part was adsorbed on the surface of the Polyethylene centrifuging tu bes.…”

Study of the Behavior of Sb(III) and Tl(III) in Micro- and Macroconcentrations by Centrifugation

“…The centrifugation method is frequently used to study the colloidal state of radionuclides [1][2][3][4][5][6][7][8][9][10]. In previous communications [1,2] the formation of colloidal Ce(III) hydroxide in trace concentrations has been found by this method.…”