Magnesium-28 in Rain: Produced by Cosmic Rays

Science  02 Dec 1966:
Vol. 154, Issue 3753, pp. 1180-1181
DOI: 10.1126/science.154.3753.1180


Existence of magnesium-28 (half-life, 21.3 hours) produced by cosmic rays in rain at concentrations of 1.7 and 6.1 x 10-1 atoms per milliliter was established radiochemically by isolating this nuclide from several hundred liters of rain samples collected at Fayetteville, Arkansas.