# In what sense did the Oklo reactor "trap" its own nuclear waste?

A number of popular writings on the natural fission reactor at Oklo, Gabon (e.g. here) state that some of the energetic byproducts (krypton and xenon, presumably 85Kr and 133Xe) of the reactor were "trapped" in aluminophosphate.

How, exactly, does "aluminophosphate" (I assume this is some sort of framework mineral?) trap gaseous elements? Is it related to the mechanism by which clathrates trap gases?

• Huh, I never even knew there was a natural nuclear reactor. Thanks for asking this question, I wouldn't have found out otherwise! May 27 '14 at 0:41