Letter | Published:

Preparation of Radio-Element 3215P by Means of an Electric Field

Nature volume 141, page 1103 (18 June 1938) | Download Citation



I WISH to correct slightly my recent letter in NATURE1 on this subject. The number of neutrons emitted by a radium plus beryllium neutron source has been accurately measured (C. J. Bakker2 and other observers) and found to be (2·1 ± 0·2) × 104 neutrons per sec. per mC. radium. The source of 120 mgm. used in our experiments emitted during nine days about 1·96 × 1012 neutrons. If each neutron transformed an atom of sulphur into radio phosphorus (ideal case certainly not realized) we should obtain 1·96 × 1012 atoms of 3215P weighing about 10-10 gm. Hence the coloration and the increase in weight of 3·7 mgm. of the electrode in our experiment cannot be due to the radio-phosphorus.

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  1. 1.

    , NATURE, 141, 871 (1938).

  2. 2.

    , Physica, 4, 723 (1937).

  3. 3.

    , , , NATURE, 141, 916 (1938).

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  1. Laboratory of Radioactivity, Institute of Physical Chemistry, University of Liège. May 20.



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