这也是易裂变同位素。
铀或钚的同位素被称为裂变材料，即我们可以利用自由中子去轰击它们来产生裂变反应。
The uranium or plutonium isotopes are referred to as "fissile," which means we can use them to induce fission by bombarding them with free neutrons.
铀或钚的同位素被称为裂变材料，即我们可以利用自由中子去轰击它们来产生裂变反应。
"The uranium or plutonium isotopes are referred to as" fissile, "which means we can use them to induce fission by bombarding them with free neutrons."
程序在有天然放射性同位素和裂变产物存在下也是可用的。
In the presence of naturally radioactive isotopes and fission product...
另一方面，氪-85是铀-235和钋-239的核裂变产物。 对氪-85的同位素含量测定可以用于监督国际核公约的执行情况。
On the other hand, analyses of 85 Kr, a fission product of uranium-235 and plutonium-239, can serve as a means to help verify compliance with the Nuclear Non-Proliferation Treaty.
铀（U）元素就是一个很好的例子。天然铀有两种同位素；较轻的负235可以裂变，较重的铀238则不会裂变。
The prime example is the element uranium (U), which occurs naturally as two isotopes-the lighter, fissionable U-235 and the heavier, non-fissionable U-238.
由于较低的入射道库仑位垒、较低的不对称裂变谷中的条件鞍点和较小的中子分离能，一般地说，丰中子同位素的超重核形成截面明显增强。
The formation cross sections of the neutron-rich isotope are, generally speaking, obviously enhanced due to the lower Coloumb barrier, lower height of the conditional saddle-point…
尤其是其极具可裂变性的同位素钸239，被用作一种核反应燃料并用在核武器中。
It is a radiological poison, specifically absorbed by bone marrow, and is used, especially the highly fissionable isotope Pu 239, as a reactor fuel and in nuclear weapons.
尤其是其极具可裂变性的同位素钸239，被用作一种核反应燃料并用在核武器中。
It is a radiological poison, specifically absorbed by bone marrow, and is used, especially the highly fissionable isotope Pu 239, as a reactor fuel and in nuclear weapons.
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