05 August 1966
Vol 153, Issue 3736

About The Cover

Autoradiogrph of the rain residue collectedin japan, 20 May 1965. The residue was exposed to Kodek KK x-ray film for 6 days (23-29 November 1965). The light spots correspond to the highly radioactive particles produced in the second Chinese nuclear explosion on 14 May 1965 (about X 5). See page 633. [K. Yoshikawa, University of Arkansas]