Radiochemical separation of carrier-free <SUP>52</SUP>Fe from chromium-target by isopropyl ether extraction

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Other Title
  • クロム・ターゲットよりイソプロピルエーテル抽出法による無担体<SUP>52</SUP>Feの放射化学的分離
  • クロム ターゲット ヨリ イソプロピルエーテル チュウシュツホウ ニ ヨル ムタンタイ 52Fe ノ ホウシャ カガクテキ ブンリ

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In connection with the practical production of 52Fe formed by bombardment of 3He and α particles on natural chromium, the solvent extractions of carrierfree 52Fe with isopropyl ether (IPE) and methylisobutyl ketone (MIBK) from chromium targets and other byproduced radioactive isotopes are investigated.<BR>The extractability and the separation conditions of Fe(III), V(IV), Cr (III) and Mn (II) from hydrochloric acid solution were examined in detail by use of 59Fe, 48V, 51Cr and 54Mn tracers. The advantage and the disadvantage of both methods are discussed with giving considerations to high radiation level, rapidness and radiochemical purity.<BR>It was shown that the radicactive iron can be separated in carrier-free state from the chromium and others by isopropyl ether, which is superior to methyl-isobutyl ketone.<BR>In the production process, use was made of a natural chromium metal target of about 70×20×0.5 mm dimension electroplated on a copper block; after the electroplating, silver is also electroplated on the copper surface to get a target assembly from which the chromium is easily dissolvable into warm hydrochloric acid. Thus, by making use of remarkable difference of extractability of Fe(III) from that of V(IV), Cr(III) and Mn(II) in IPE, the extraction of ferric iron can be efficiently performed at the acidity of 8N hydrochloric acid solution.<BR>The separation seemed to be troublesome, because of the tendency of chromium to form passive state, but it was found that O2-bubbling has a very large accelerating effect on the dissolution of the irradiated chromium. It is thought that the increase in the dissolution rate is probably due to not only the minor impurity formed in the chromium target in the course of the irradiation, but also the dissolution was carried out as it was plated on the copper surface.<BR>Extraction of the 52Fe from the hydrochloric acid solution into isopropyl ether suits well for the remotecontrolled technique.<BR>The extracted 52Fe is taken out from the remotehandling cell, then it is back-extracted into water and supplied to medical researches. The radiochemical purity of the 52Fe extracted by the proposed method was proved to be satisfactory by the results of gamma-spectrometry and decay curve of 52Fe.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 20 (12), 1530-1537, 1971

    The Japan Society for Analytical Chemistry

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