Effets chimiques associés à l’émission β^-

Abstract

Avec 2 figures. (Regu le 12 eeptembre 1968) R6sum6Les consequences chimiques de la disintegration ß~ ont ete etudiees sur le systeme 8β Μο --> ""Tc. II apparait que, quelles que soient les conditions de pH, l'absence ou la presence d'entraineurs (Tc IV , Tc vn ) ou d'oxygfene dissous, le technetium se trouve toujours forme ä son degr6 d'oxydation le plus εΐβνέ Tc VI1 . Zusammenfa ssungDie chemischen Effekte beim /J _ -Zerfall wurden im System ββ Μο 99m Tc untersucht. Unabhängig von den Versuchsbedingungen bezüglich des pn, der Gegenwart bzw. Abwesenheit von Träger (Tc IV , Tc VI1 ) oder des gelösten Sauerstoffs tritt das Technetium offenbar immer in seiner höchsten Wertigkeitsstufe, nämlich Tc VI1 , auf. SummaryThe chemical consequences of ß~ disintegration have been studied with the "Mo --> <""»Tc system. Whatever the conditions of pn, presence or absence of carriers (Tc lv , Tc VI1 ) or of dissolved oxygen, the technetium is apparently always found in its highest oxidation state, Tc VI1 .

Extraction of Technetium from Nitric Acid by Tetraphenyl Arsonium Chloride

“…A double logarithmic plot of the distribution coefficient as function of the concentration of tetraphenyl arsonium chloride in chloroform (Fig. 1) shows that the value of the slope is 1 which is an agreement with the assumption that a 1 : 1 complex with the formula [(C 6 Hs) 4 As]Tc0 4 is formed. It also supports the findings ofMAZZOCCHIN et al [1], …”

“…This method has been used for the separation of Tc vu from molybdenum and from uranium [2,3,4]. However, the extraction of Tc vn was found to attain high values only at low acid concentrations in the sequence H 2 S0 4 > HCl > HBr > HN0 3 [2], The present work was undertaken in order to study the influence of tetraphenyl arsonium chloride concentration on the extraction of Tc vn into chloroform in the presence of 3 M HN0 3 with the aim of finding a procedure for quantitative separation of Tc vn under these conditions.…”

Chemical Effects of Isomeric Transition of 95mTc in Inorganic Tc(IV)-Complexes

“…This is suppressed by using a hydrogen saturated solution. It has been found by FERADINI et al [12] that the Tc02 χ H20 at a concentration of about 10" 5 Μ is easily oxidized to Tc04. For ΙΟ -3 Μ solutions the ambient atmosphere becomes unimportant.…”

Chemical Effects of the Nuclear Isomeric Transition 95mTc-95Tc in Some Solid Pertechnetates

“…Further, ammonium perrhenate gives retentions ranging from 88 to 50% dependent on the temperature during Irradiation and mode of analysis [7]. Finally ''Tc formed by ß~ decay in M0O3 only appears as Tc(VII) [8].…”