核燃料再处理厂或沿海核动力反应堆以及其它一些低强度放射性废物等种种小型定量放射源皆向海洋输入人工放射性。大气层核试验的散落物同样是重要放射源。50年代和60年代在大气层进行了一系列核试验,核爆炸后进入大气层的放射性碎屑最终散落在海洋或地面上。在这些放射性同位素中,长寿命同位素90Sr(半衰期29.0年)、137Cs(半衰期30.2 All sources of small radioactive sources, such as nuclear fuel reprocessing plants or coastal nuclear power reactors, and other low-intensity radioactive wastes, have been imported into the oceans for artificial radioactivity. Atmospheric nuclear test scatter is also an important source of radioactivity. In the 1950s and 1960s, a series of nuclear tests were conducted in the atmosphere, and the radioactive debris that entered the atmosphere after the nuclear explosion eventually scattered on the sea or on the ground. Of these radioisotopes, the long-lived isotope 90Sr (half-life 29.0 years), 137Cs (half-life 30.2