然而，有些含氙同位素的矿物并非如此，是由铀的放射性衰变产生的。
However, some of the minerals contain xenon isotopes unlike those usually produced by radioactive decay of uranium.
有些核裂变产生的副产品自身具有放射性。这些物质的衰变，也在产生热能。
Some byproducts of the nuclear fission are themselves radioactive.These decay, producing heat.
由放射性钠衰变产生正电子，冷却后形成一个由大约100万个正电子组成的体积同样大小的粒子云团，这团正电子被存放在相邻的一个容器中。
The positrons, produced by the decay of radioactive sodium, are cooled into a similarly sized cloud of around 1m particles and held in a neighbouring trap.
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