Science. 1965 Jul 16;149(3681):300-2. doi: 10.1126/science.149.3681.300.
At Bikini Atoll, radioactivity from strontium-90 deposited in the growing shell of a giant clam, presumably during the testing of nuclear weapons in 1956 and 1958, produced unmistakable lines on radioautographs made from transverse sections of the shell. The regular banding seen in the sections is interpreted as annular in nature. One annulus precedes the 1956 layer of radioactivity, two intervene in 1958, and six follow to the time of collection, so that this clam (length, 52 centimeters) was in its 9th year of life.
在比基尼环礁，放射性锶-90 沉积在巨蛤不断生长的贝壳中，这可能是在 1956 年和 1958 年进行核武器试验期间造成的。从贝壳的横切片中制成的放射自显影图片上出现了清晰的线条。在切片中看到的规则条带被解释为具有环形结构。1956 年放射性物质层之前有一个环，1958 年有两个环，六个环之后是采集时的时间，因此这只蛤（长 52 厘米）已经 9 岁了。
