Calcium Isotope with Mass 41 and the Radioactive Half-period of Potassium


THE values given in a previous note1 for the radioactive half-period of the potassium isotope with mass 41, as derived from the abnormality in the atomic weight of calcium extracted from Rhiconich and Portsoy pegmatites, stand in need of correction.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.


  1. 1

    NATURE, 131, 688, May 13, 1933.

  2. 2

    Geological Survey, Summary of Progress for 1919, pp. 43–4.

  3. 3

    Ann. Rep. Chem. Soc., 27, 310–11; 1930.

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Further reading


By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.