For example, production of xenon 136 began at Oklo only about a minute after the onset of self-sustained fission.例如在欧克陆，自我持续的核反应开始约一秒后就产生氙136。
Two billion years ago the conditions necessary for self-sustained fission must not have been too rare, so perhaps other 在20亿年前，要形成自我维系的核分裂条件可能不会太稀奇，所以有朝一日我们或许会发现其它的天然核反应堆。