Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版：英文原文完整保留，中文紧随对应单元；术语采用 v20260916 确认表，自动语义审校结果可追溯。

Uranium-235 Fission

铀-235裂变
Detailed example
详细示例
Chain reaction.
链式反应
Fission fragments.
裂变碎片
Average energy release.
平均能量释放
 Index

Fission concepts

Reference
Mulligan
索引 裂变概念 参考 Mulligan
 
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Uranium-235 Fission Example

铀-235裂变示例
Initiation of this process
启动这一过程
Chain reaction.
链式反应
Fission fragments.
裂变碎片
Average energy release.
平均能量释放
Detailed energy release calculation
详细能量释放计算
 Index

Fission concepts

Reference
Mulligan
索引 裂变概念 参考 Mulligan
 
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Energy From Uranium Fission

铀裂变的能源
Form of Energy Released
释放的能量形式
 Amount of Energy Released (MeV)
释放的能量（MeV）
Kinetic energy of two fission fragments
两个裂变碎片的动能
168
Immediate gamma rays
即时伽马射线
7
Delayed gamma rays
延迟伽马射线
3-12
Fission neutrons
裂变中子
5
Energy of decay products of fission fragments
裂变碎片衰变产物的能量
...
Gamma rays
伽马射线
7
Beta particles
β粒子
8
Neutrons
中子
12
Average total energy released
平均总释放能量
215 MeV
 Index

Fission concepts

Reference
Mulligan
Table 12.3.
索引 裂变概念 参考 Mulligan 表 12.3。
 
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If at least one neutron from each fission strikes another U-235 nucleus and initiates fission, then the chain reaction is sustained.

如果每个裂变产生的至少一个中子都能击中另一个U-235核并引发裂变，那么链式反应将得以维持。
More detail on chain reaction.
链式反应的更多细节
Initiation of chain reaction.
链式反应的引发
 Index

Fission concepts
索引 裂变概念
 
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Uranium-235 Chain Reaction

铀-235的链式反应

If an least one neutron from U-235 fission strikes another nucleus and causes it to fission, then the chain reaction will continue. If the reaction will sustain itself, it is said to be "critical", and the mass of U-235 required to produced the critical condition is said to be a "critical mass". A critical chain reaction can be achieved at low concentrations of U-235 if the neutrons from fission are moderated to lower their speed, since the probability for fission with slow neutrons is greater.

如果一个来自U-235裂变的中子击中另一个核并引起它裂变，那么链式反应将持续进行。如果反应能够自我维持，就称为‘临界’，使U-235达到临界状态所需的质量称为‘临界质量’。在U-235浓度较低时，通过将裂变中子减速以降低其速度，可以实现临界链式反应，因为慢中子引发裂变的概率更大。
A fission chain reaction produces intermediate mass fragments which are highly radioactive and produce further energy by their radioactive decay. Some of them produce neutrons, called delayed neutrons, which contribute to the fission chain reaction.
裂变链式反应会产生中间质量的碎片，这些碎片具有高度放射性，并通过它们的放射性衰变进一步产生能量。其中一些碎片会产生中子，称为延迟中子，这些中子有助于裂变链式反应。
 Index

Fission concepts
索引 裂变概念
 
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