The neutron source can be understood as a catalyst for fission, and with the additional neutrons it provides, even uranium-235 below the critical mass can split efficiently.

Theoretically, polonium and radium separated from uranium ore can form a neutron source with beryllium, which does not have any technical difficulties, purely taking advantage of the characteristics of beryllium to release a large number of neutrons when bombarded by α particles, which can really take effect as long as they are put together. All three are naturally occurring substances that are much more feasible than man-made elements that are extremely difficult to serve or require complex processes to produce.

As for Roland's choice of polonium over radium, it was purely for safety reasons - although the half-life of polonium-210 is short, it is basically α decay, and the photon production of γ is extremely low. That is, as long as it is not eaten, it is almost as safe as uranium. Radium, on the other hand, is a potential safety hazard that cannot be ignored, whether it is radon gas from subsequent decay or γ photons emitted by itself. In order to avoid surprises during the experiment, the polonium-beryllium neutron source is the most suitable choice.

In addition, beryllium also has the property of reflecting neutrons, and if it is used as a shell, it can further increase the efficiency of neutron utilization. If you combine both, with a sufficient amount of uranium-235, you can achieve good results even in the simplest and most reliable gun construction.

Beryllium is widely found in emeralds, and such a distinctive mineral saves Aqima the effort of wading through mountains and rivers to find it, as long as the news is released through merchant channels and widely purchased in the four kingdoms.

Roland knows very well what the level of technology in Neverwinter is - the principle of brilliant radiation is simple, but every increase in the utilization rate is a threshold, from 1% to more than 90%, all of which do not require a large number of theoretical calculations and test corrections, if it cannot achieve a high efficiency of releasing energy, it is impossible to miniaturize weapons, and it will also make the weapon-grade uranium that has been accumulated so hard to be wasted. Without Lucia, the loss of refining alone would be an insurmountable peak.

But again, when the wear and tear can be afforded, or regardless of the loss, the hand of the nuclear bomb is not just a joke. The technical threshold varies widely, but the principle remains the same, thanks to the inherent advantage of mass-energy conversion over chemical gunpowder, even if only 1% of uranium is involved in fission, its power is enough to turn the tide of the war.

In the face of this life-and-death battle that will determine the fate of the race, he will do his best.

What's more, stealing the divine fire in such a barbaric era and narrowing the distance between humans and the sun is not also a kind of romance in itself?

As long as there is the slightest possibility, he is willing to try.

"Very well, keep it at that," Roland patted Lucia on the head, "and when all the lead cabinets are full, the official trial can begin." ”

"Yes, Your Majesty!" Lucia said energetically.

At the same time, Neverwinter, the Academy of Sky Knights.

The area, which is also huge to the west of the new institute, is quiet – it's a day off for students, and most people leave the campus early to enjoy time with their families, but Goode is an exception.

"Upwind, press the bar!"

"Crosswind, roll!"

He sits on the simulator and sets the direction of the wind for himself while responding to the rules in the Flight Manual, the wooden rod creaking and snapping like an old water wheel in disrepair. The temperature in the training room was quite sweltering, and after a long time of practice, his back was soaked with sweat, and from time to time there were beads of sweat dripping from his chin, sprinkled on the rudimentary "dashboard".

It wasn't until the grip slipped, and Goode stopped his movements, leaning back in his chair and letting out a sigh.

After nearly half a year of study, he is no longer the original layman who didn't know anything, and the "Flight Manual" compiled by Her Royal Highness the Princess is not to mention that it is like memorizing it backwards, and the basic operation can be said to be all imprinted in his mind. From the first time I was in a hurry when I got on the bridge, to now I can operate according to the password with my eyes closed, and if I give an order to myself, I don't even need to say it, as long as I think about it, my body will react as soon as possible.

But will it make you fly?

No matter how much he imagined, he couldn't sketch the scene of the wind in his mind. "Capture the direction and magnitude of the wind, feel the posture and tremor of the body, and apply the force to coordinate with it" - these are the words of the manual, but he has no idea what it is like. Whether he pulls halfway or all the way down, the bridge doesn't give him any feedback, and the "dashboard" drawn with ink lines is more like a mockery of his efforts.

The more skillful he practiced, the more frustrated Goode became.

Just when he was a little upset, the door of the training room suddenly creaked open.

"You're here—"

"Well, I guessed right, right?"

Goode looked back and looked at the two men who walked into the room in surprise - they were none other than Finkin and Hinds from the same squad, "Why are you ......?"

"Why don't you take time off and have fun?" Finjin whistled, "because fun is in the academy." ”

"It's you, it's okay if you don't have a family, don't you have a lovely sister?" Hinds stepped forward and hooked his neck, "She told me to tell you not to be tired, tsk...... That's great. ”

Goode's expression suddenly tightened, "Wait, you two went to where I live?"

"Nonsense, where else are we going to find you?" Finjin raised an eyebrow at him, "Her name is Rachel, isn't she, how about introducing it to us?"

"Don't even think about it," Goode glared back.

"Do you think we don't have enough conditions," Fenjin said unconvinced, "at least I still have a formal residence in the Chishuihe community!"

Goode was silent for a moment, and finally shook his head helplessly, "It's not about you, it's my sister...... Rachel has her own problems. You won't want to be with her. ”

"Why? I think she's pretty good," Hinds wondered.

"Tell me?" Finkin, too, looked curious.

"Don't ask about that," said Goode, puffed, "and say something else—what do you mean by fun?"

Finjin didn't dwell on any further, he lowered his voice and said mysteriously, "Would you like to try a real plane?"

Goode couldn't help but be stunned, "What did you say?"

"I saw it when I climbed the fence a few days ago," Finkin's slightly smug smile said, "There are several new planes in the storehouse of the airfield, and although they are covered with cloth, they are similar in size to the Unicorn piloted by Her Royal Highness the Princess. That is, it was a plane for us!"

"A few days ago? Why didn't you say that?"

"It's not that I'm afraid you'll get too excited and leak the news. He shrugged, "And today is a day off, and there are only a few people in the academy, so it's a chance to sneak in and see what it's really like!"

"You're crazy!" Goode said incredulously, "we can't enter the airfield without permission!"

"Those soldiers won't let you in either, okay? Finkin's blank look at him, "Of course it's going to be a different way, and not going through the airfield." ”

"But ......"

"We're just going to take a look," Hinds said, "You can feel it, Tilly has been smiling a lot less lately, and her training has been a lot stricter." If it goes on like this, you may have to wait a month or two before you can actually touch it. Wouldn't you like to see in advance what the plane we're going to fly looks like compared to this humble wooden platform?"

"If you don't want to, we'll go first. Finjin frowned.

Goode hesitated for a long time, and the dull squeak of the wooden pole when he played with it echoed in his mind, and the dazed feeling that he couldn't feel progress no matter how much he practiced, and finally he bit his lip and nodded, "I'll go, lead the way." ”

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