Actinides in Perspective. Proceedings of the Actinides–1981 by Norman M. Edelstein PDF

By Norman M. Edelstein

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Additional info for Actinides in Perspective. Proceedings of the Actinides–1981 Conference, Pacific Grove, California, USA, 10–15 September 1981

Sample text

3-sec activity by bombard­ ing einsteinium, californium, and curium isotopes with various ions from Ü B to 18ο. 7-hour spontaneous-fission emitter. After expending much effort in this direction without success, we decided to reserve judgement and continue in our efforts to find an alpha emitter which could be assigned without ambiguity to element 104. An atom that disintegrates by undergoing spontaneous fission provides little in the way of a "fingerprint" since one fission differs little from another, and only the half-life can be used to distinguish them.

Walton, Seaborg, and the author, a novel "double recoil" technique was described which permitted the identification by both physical and chemical means of an isotope of element 102. A mixture of curium isotopes was bombarded with 68-MeV l^C i o n s provided by the new Berkeley HILAC. The following reactions were assumed to take place: 246 AIP - Β· Cm ♦ 12 X » 254 102 ♦ 4 Jn 32 254 ιπ9 « . 250 F m a . 10 ^ secs* 100 F m 30 mïn ) As shown in Fig. 5% 2 4 6 C m was set up in such a manner that the recoiling element-102 atoms produced in the bombardment were stopped in helium gas and then attracted electrically as positive ions to a moving metallic belt mounted nearby.

For this purpose we used a cation-exchange column for the first time in the heavy element region. It had been shown that ion ex­ change chromatography was eminently suitable for separating the rare-earth elements—elements whose chemical properties were so similar that it was difficult to use ordinary aqueous chemical methods. Seaborg's actinide hypothesis suggested that this method should be equally applicable to the new rare-earthlike series of (III) elements. In addition, the technique lent itself nicely to the making of thin samples for alpha particle measurement, an essential requirement in the energy analysis of their radioactive decay.

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