Carrier-free Manganese-54 from the Pile?


A SOLUTION of radioiron which had been obtained from Oak Ridge (catalogue item 39, high specific activity) six months previously was found to contain considerable radioactivity from a radioelement which high-pressure ionization-chamber absorption measurements showed to have a gamma-ray of about 0.8 MeV., that is, softer than that from iron-59 or cobalt-60 (1.1 and 1.3 MeV.). The iron was precipitated out with cupferron, and the activity of the filtrate was examined. The following measurements were made : (1) absorption in aluminium ; (2) absorption in lead ; (3) decay measurements. All measurements fitted within experimental error with those of Livingood and Seaborg1 for manganese-54, which they obtained by the reactions Fe + D, Cr + D and V + He.

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  1. 1

    Livingood and Seaborg, Phys. Rev., 54, 391 (1938).

  2. 2

    Deutsch and Elliott, Phys. Rev., 65, 211 (1944).

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ALPER, T., DU PREEZ, L. Carrier-free Manganese-54 from the Pile?. Nature 165, 689–690 (1950).

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