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By Yusuru Kusaka

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By Yusuru Kusaka

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After addition of 15-20 ❑l glecial acetic acid snd cooled with liquid Nz, the Co is extracted by 25 ml oxine moln. in CHClg (%). The Co is beck-extracted into 10 ❑l 9 ~ HC1, ppted. with N%OZ, and filtered. Yield = - 4C$. 9 ❑ NiW(d,a) Nickel oxide enriched in ~ie4 Ion exchange The nickel oxide target (about 50 ug ) ie di6aolved in 10 N HC1 end this soln. is then placed on an ionic exchs& column (8 mm in diameter and lho mu tall) with a DOwex-2 reain that hes been previously we8hed with 15 ❑in cone.

Usually require appaatus They as uncomplicated as a separator funnel and may readily be adapted to remote handling procedures. A variety of extraction separation techniques has been applied to problemg of isolation and radiochemical purification of nuclides. Most of the extractions employed in radlochemistry are based on previously developed conventional analytical extractions, and general information of the technique can be found in the literature (89,185). With thig technique it is eagy to repeat the operations of extraction, back-extraction to improve the separating and waBhing with proper solvents without great expenditure of time, The back extraction technique is also applicable as a rapid “milking” method in which a daughter product is separated from the mother activity in the organic solvent layer by shaking ‘ with am appropriate aqueous waghing solution.

In this study, the,Bi207 activity was fixed on about 1 cm3 of. 5 ~ hydrochloric acid medium. The pb207m daughter diffuses out of the small reSin spheres into the interstitial solution and a few drops of thlm solution are transferred rapidly to a counter (31). The use of a hypodermic syringe enhsnced the elution speed in this case. In a later paper (32) these same investigators describe an interesting appsxatus for the measurement of the half-life of Pb=’o’7m . ”LUI II squee

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