Single Fallout Particles and Zirconium-95 from the Chinese Nuclear Explosion of 9 May 1966

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Science  17 Mar 1967:
Vol. 155, Issue 3768, pp. 1405-1407
DOI: 10.1126/science.155.3768.1405


Daily fluctuations of the number of single fallout particles and activity of zirconium-95 in the groundlevel air were measured at Fayetteville (94°W, 36°N), Arkansas, for a period of about 3 months after the Chinese nuclear explosion of 9 May 1966. We found a cyclic pattern of variations for both zirconium-95 and fallout particles; this indicated that they were airborne for a long period and traveled far. Apparently, some of the particles circled the world more than once.