Roland picked out a lead box, opened the lid, and took the silver-white metal block inside in his hand, feeling its heavy weight - before it was stimulated, it was not much different from a piece of pure iron, as long as it was not put in his mouth and licked twice, it could be regarded as basically harmless. If you don't know it well enough, it's hard to imagine just by looking at its appearance, what amazing power it has in its small body.

It is precisely with it that human beings have touched the threshold of mass and energy transformation for the first time.

Compared with all the previous chemical gunpowder, this step can be said to have stepped up to a new level.

Roland roughly counted the number of lead boxes, about fifty, and aside from the weight of the containers, each box was a full fifty kilograms of uranium-235 based on one kilogram of storage, and its purity was close to 100 percent.

And a lead cabinet like this, there is more than one in the room.

If you pour them all together......

Probably the institute is really "high-energy", right?

"How do you use these things to turn into what you called the 'Radiance of the Sun'?" asked the nightingale, curious, "to make special machines, or to ignite them?" ”

"Want to know?" Roland couldn't help but laugh, "It's easier than you think, just pile the metal pieces in the box together, and they will automatically emit light and heat." The uranium in this single cabinet alone would be enough to raze Neverwinter to the ground, so Lucia's responsibility is great, in case she shakes her hand—"

The scene suddenly fell into a dead silence.

Lucia covered her mouth, a look of horror in her eyes.

“...... "No," Aqima said in disbelief after a moment, "you mean that if one of us is not careful, we could destroy the whole city?"

The nightingale flashed even more, snatched the lead box from Roland's hand and put it back in the cabinet, then grabbed his hand and dragged it out.

"Hey...... Wait, what are you going to do?"

"Do you need to ask!" Nightingale said hurriedly, "of course to take you out of the city and have these things taken away!" Lucia, go and inform Wendy and tell her to contact the Executive Hall!"

"I ...... I'm going to find Tilly too," Azima gritted her teeth, "only she can call the Sleeping Charm." ”

"Stop—I'm kidding—"

There was a sudden rush of chickens and dogs in the room, and it took Roland a while to calm everyone down.

"Are you sure you're just joking?" said Nightingale.

"Ahem, of course...... I'm just talking about the principle," he quickly added, "but it's not so easy to achieve excitation, and even if I try my best, it doesn't necessarily guarantee success." ”

Lucia breathed a sigh of relief, "Your Majesty...... You've scared my feet out. ”

"It's not funny," Nightingale glared at him, "if Wendy and the book hear that, whether it's a joke or not—"

"I'm afraid they'll all ask for the new institute to be moved away from Neverwinter, right?" Roland said helplessly.

"If you know, or move you to a safe place. ”

"Well, when I didn't say those things before...... he cleared his throat, "as long as you don't say it, Wendy and the scroll won't know." ”

"Maybe a bird has heard it. The nightingale skimmed out the window.

"Cut the message, a bottle of chaos drink. Roland said without hesitation.

"Deal. She disappeared in front of the three in the blink of an eye.

Looking at Lucia and Azima, who were dumbfounded, Roland shrugged, "Ugh...... Don't care, it's part of the joke. ”

Moments later, Nightingale returned to the house, "No suspicious targets found, but reward—"

"It's still valid. ”

Her expression finally softened, and she hummed a minor tune and went off to the side to chew on the dried fish.

"That...... Your Majesty," Azima hesitated before he said solemnly, "what you said before was not all a joke, was it? She paused, "Also, you said that if there is an accident at the institute, or if there are signs of someone breaking in, the first thing to do is to notify the guards to cordon off the scene, and then immediately report back to the castle, rather than entering the courtyard to check the situation." This proves ...... They're dangerous, right?"

Roland looked at her with some surprise, "Good observation. You're basically right – in addition to toxicity, weight is also one of the key factors, and that's what you want to do when you put it apart. "Being able to judge the nature of the extract from the rules and regulations can be regarded as cautious and meticulous, and it is this carefulness that has awakened her ability to trace back to the origin...... "But weight alone can only endanger the research institute, and if you want it to become a weapon against the devil, you need another thing." ”

"The particles that were left alone?" Aqima quickly reacted.

"Not exactly, but at least half right. ”

The composition of natural uranium ore is very complex, in addition to uranium compounds, it is usually accompanied by a large number of radioactive materials, most of which are secondary products after decay, some have completely lost their radioactivity and become stabilizers, and some are still on the long road to decay. Although the Radiators had made initial refinements of the ore during the construction of the Temple of the Damned, the basic ingredients were still roughly the same, as evidenced by Lucia's refinement.

Among them, the largest content is uranium-238, although it cannot be made into a weapon, but it can be recognized by the festival Rubik's Cube, and its efficiency is almost the same as that of uranium-235, so it was all sent to the backyard of Beipo Mountain.

The second is uranium-235, which can be regarded as weapon-grade when the purity reaches more than ninety-percent, and the content in nature is extremely low, accounting for only 1% of the natural uranium element, so the first difficulty encountered if you want to take the "brilliant radiation" route is refining, which is also a hurdle that most people can't cross.

But it is not the rarest - subsequent decay products such as thorium, radium, radon, and polonium are theoretically rare, and what Roland needs is the naturally occurring polonium-210, which is also the most prevalent isotope in the polonium family.

As the flower of the motherland cultivated after nine years of compulsory education, Roland is familiar with the two elements of radium and polonium, and Marie Curie, who is repeatedly mentioned in textbooks, is famous in history because of her discovery. Although Polonium-210 has a half-life of only over 100 days and its ridiculously low levels have led to the failure of Marie Curie's repeated extractions, she still points to its existence in the strong radioactivity of the ore dissolution.

Both radium and polonium can be used to create neutron sources – which is also related to the second difficulty of brilliant emission: detonation.

The principle of the first generation of nuclear weapons was so simple that it can be summed up in one sentence: nuclear fission releases energy. In the case of uranium, uranium-235 is excited into unstable uranium-236 after receiving one neutron, and then splitting into two lighter nuclides and more free neutrons, and the difference in quality between them is converted into energy.

Obviously, the released neutrons will hit other nuclides, and so on, which is a chain reaction, and the huge energy burst out at the same time is no different from an explosion.

But in the microcosm, the gap between the nuclei of the atoms is like an abyss - as it is written in the textbook, if the atom is a football field, then the nucleus is just an ant on it. If you are unlucky, the neutrons will soon fly out of bounds and the reaction will stop. To make sure that every ant is hit, it is obviously necessary to pile up enough pitches around its perimeter to ensure that no matter which direction the neutron flies, there is an ant in its path.

Reflected in the macrocosm, it is obvious that "quality" and "shape" are obvious.

In fact, the critical mass is not a fixed value, just as a straight pitch is obviously inferior to a stacked pitch in terms of the chance of being hit. The exact outcome requires a lot of calculations depending on its shape, and Roland has heard an anecdote about someone miscalculating the data that led to the defeat of the war. Of course, as a latecomer standing on the shoulders of giants, he naturally did not have to start from scratch, and countless tests have proved that when the object is spherical, the critical mass is the smallest, and uranium-235 is fifty-two kilograms.

He was cautious enough to limit the amount of uranium in each lead box to one kilogram.

However, as the critical mass is not fixed, if the area of the stadium can be greatly reduced, or if enough additional neutrons can be provided for the nuclides, then the critical value will drop significantly. The former is the principle of implosion bombs - the detonating explosive is arranged on the periphery of the bomb body, and when it explodes, the reactants are instantly squeezed into one place, causing its density to increase sharply, thus exceeding the critical limit. For the existing technology of Neverwinter, whether it is calculating the critical mass of irregular monomers or accurately controlling the centripetal detonation of explosives, there are too many difficulties, so Roland set his sights on the latter-

A neutron source is used to ensure the continuation of the fission reaction.

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