Science. 1972 Jul 21;177(4045):270-2. doi: 10.1126/science.177.4045.270.
Autoradiagraphs and x-radiographs have been made of vertical sections through the centers of reef corals from Eniwetok. Radioactivity bands in the coral structure are caused by strontium-90 and are related to specific series of nuclear tests, thus making possible calculation of long-term growth rates. These data indicate that the cyclic variations in radial density revealed by x-radiography are annual.
已对取自埃尼威托克环礁的珊瑚垂直切片进行了放射自显影和 X 射线照相。珊瑚结构中的放射性带是由锶-90 引起的,与特定系列的核试验有关,因此可以计算出长期生长率。这些数据表明,X 射线照相显示的径向密度周期性变化是年度变化。