Baugh J O, Yoshikawa K, Kuroda P K
Science. 1967 Mar 17;155(3768):1405-7. 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 degrees W, 36 degrees 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.
1966年5月9日中国进行核爆炸后约3个月的时间里，在阿肯色州费耶特维尔（西经94度，北纬36度）对地面空气中单个沉降粒子的数量和锆-95的活度进行了每日波动测量。我们发现锆-95和沉降粒子都呈现出周期性变化模式；这表明它们在空气中停留了很长时间并且传播得很远。显然，一些粒子不止一次地环绕地球。
