自然选择的证明采用立论的作用（核言碎语273）

193 按源的显著性分类

Classification by significance of the source

（https://www.nuclear-power.com/）

按源的显著性分类

Medium neutron sources

中型中子源

• Bremssstrahlung from Electron Accelerators / Photofission. When slowed down rapidly in a heavy target, energetic electrons emit intense gamma radiation during the deceleration process. This is known as Bremsstrahlung or braking radiation. The interaction of the gamma radiation with the target produces neutrons via the (γ,n) reaction, or the (γ, fission) reaction when a fissile target is used. e-→Pb → γ→ Pb →(γ,n) and (γ,fission). The Bremsstrahlung γ energy exceeds the binding energy of the “last” neutron in the target. A source strength of 1013 neutrons/second produced in short (i.e., < 5 μs) pulses can be readily realized.
• 来自电子加速器/光裂变的韧致辐射。当在重靶中快速减速时，高能电子在减速过程中会发出强烈的γ辐射。这就是所谓的轫致辐射或制动辐射。当使用裂变靶时，γ辐射与靶的相互作用通过（γ，n）反应或（γ，裂变）反应产生中子。e-→Pb→ γ→ Pb→（γ，n）和（γ，裂变）。韧致辐射γ能量超过靶中“最后”中子的结合能。在短脉冲（即<5μs）内产生的1013个中子/秒的源强度很容易实现。

• Dense plasma focus. The dense plasma focus (DPF) is a device known as an efficient source of neutrons from fusion reactions. The dense plasma focus (DPF) mechanism is based on nuclear fusion of short-lived plasma of deuterium and/or tritium. This device produces a short-lived plasma by electromagnetic compression and acceleration that is called a pinch. This plasma is during the pinch hot and dense enough to cause nuclear fusion and the emission of neutrons.
• 稠密等离子体焦点。稠密等离子体焦点（DPF）是一种被称为来自聚变反应的有效中子源装置。稠密等离子体焦点（DPF）机制基于氘和/或氚的短寿命等离子体核聚变。这种装置通过电磁压缩和加速产生一种短寿命的等离子体，称为箍缩。这种等离子体在箍缩过程中非常热和稠密，足以引起核聚变和中子发射。

• Light ion accelerators. Neutrons can also be produced by particle accelerators using targets of deuterium, tritium, lithium, beryllium, and other low-Z materials. In this case, the target must be bombarded with accelerated hydrogen (H), deuterium (D), or tritium (T) nuclei.
• 轻离子加速器。也可以使用氘、氚、锂、铍和其他低Z材料作为靶的粒子加速器产生中子。在这种情况下，必须用加速的氢（H）、氘（D）或氚（T）核轰击靶。

注：

（以下内容来自百度百科，可以搜索以下两个词条）

等离子体聚焦装置

Z箍缩

此外，稠密等离子体焦点（dense plasma focus，DPF）也是Z箍缩发展出来的一种类型。这类装置依靠电流鞘向轴线汇聚时驱动的冲击波使氘氚气体加速和加热，在最后的压缩阶段以类似于柱形Z箍缩的方式，碰撞滞止形成剧烈发射中子束的等离子体。等离子体焦点装置单脉冲可以产生高达10个中子。

（待续）