Whoa...

The elevator climbed quickly, leading vertically to the highest place, Chen Ya also took out the second-hand Geiger counter he bought yesterday, and after pressing the switch casually, the value was immediately measured on the micro electronic blue screen:

[Current radiation value: 315mSv]

Not long after, when the elevator reached the highest place, Chen Ya and his friends just stepped out of the elevator, and the Geiger counter in his hand began to make a sound.

Multiply... Multiply... Multiply...

In the next second, the radiation value spiked rapidly.

[Current radiation value: 563mSv]

[Current radiation value: 785mSv]

[Current radiation value: 906mSv]

……

The Geiger counter jumped several times before it stopped.

"906 mSv."

The corners of Chen Ya's eyes twitched, almost tripled, but fortunately, for children, as long as the radiation value did not exceed 1,000 millisv, the body would not have much impact.

To put it a little bit, the radiation value is the radiation dose per hour.

In the past life, the maximum radiation that 'ordinary' humans could withstand in a year was 1,000 mSv, and less than 100 mSv of radiation in a short period of time was not harmful to the human body.

In other words, the hourly radiation dose on the wall is equivalent to the maximum radiation that an average person could withstand in a year a hundred years ago.

It's no wonder that humans mutate.

Now, mutants' resistance to nuclear radiation has been greatly improved.

If compared to the average person a hundred years ago, the basic data should be:

everyman

First-class boundary: 100 mSv

Secondary withstanding: (year) 1000 mSv

Tertiary lethality: 6 sieverts, i.e. more than 6000 mSv, direct lethality.

……

Mutants (Kids)

First-class boundary: 1000 mSv

Secondary withstanding: (hours) 2 sieverts, i.e. 2000 mSv.

Tertiary lethality: 15 sieverts, i.e. 15,000 mSv or more, direct lethality.

……

Siewert is a large unit, as described above.

If the first-level boundary represents the human body's 'damage boundary', it will be affected by radiation, such as a decrease in white blood cells in the blood, and staying in this environment for a long time will have a greater chance of getting sick.

Level 2 tolerance means that if the body's 'tolerance limit' exceeds the value, you will suffer from radiation sickness.

The third-degree lethality represents the 'lethal dose' of the human body and is also a one-time death, and the struggle does not have it.

……

As for the types of 'nuclear' radiation, I won't say much about it here.

There will be opportunities for popular science in the future.

At this moment, Chen Ya and his friends came to the wall, only to see that the distance was gray, as if they had climbed a 100-meter-high skyscraper, and the pedestrians under the south gate behind them had also become the size of ants.

The width of the wall is about 30 meters, and the floor is made of concrete and lead slabs, and the surface is mottled, and there are even some black blood stains.

Obviously, there were quite a few battles on the walls.

In addition, in the eaves of the outer wall, some heavy artillery pieces were also placed, and there were also many sentry guards.

But I saw that Chen Ya and the four friends walked straight to a guard, raised their right hands and saluted:

"Hello Uncle Guard."

The guard, who was dressed in combat uniform, immediately returned a standard military salute.

You read that right!

It was the traditional military salute of China in the previous life, and Chen Ya not only felt very cordial, but also said three words in his heart.

Guardians

Or, as it should be called, the 'human' guardians.

This is a special group, because their predecessors were the soldiers of the countries before the Holocaust, they have a strong faith, a tenacious will to fight, and no matter how the situation changes, the defenders have always remained neutral.

The reason is simple.

Although the nuclear war before the catastrophe was inseparable from the military, the real culprit was the person who issued the order, after all, the military is to obey the order as its duty.

Of course!

The real reason is still ......

Once a nuclear war breaks out, it is very difficult to stop unless the earth's environment is drastically changed.

Like the fuse of World War II, it was a chain reaction.

You don't fight?

Someone else blew you up with a nuclear bomb, won't you blow it back?

It's as simple as that.

After the catastrophe, in the face of the ultra-high dose of nuclear radiation on the earth, all countries can only unite to form a community with a shared future for mankind.

Even human settlements were built by the Guardians.

In fact, the guards are still the food and clothing parents of Chen Ya and others, and the orphans in the shelter received the nutrients for free before the age of eight are all squeezed out of the guards' teeth.

And at this moment, the guardian said with a friendly smile:

"The radiation on the wall is high, don't play for too long."

"Yes."

The five of them nodded their heads, apparently the guardian, who often encountered children playing on the wall, and had long been accustomed to it, and just told them to pay attention to the radiation.

Adult mutants have a much higher damage threshold than children, and they also wear protective clothing, and the radiation level on the wall, although within a safe range, is not suitable for long-term stays.

Chen Ya and his friends came to the edge and saw the thick radiation cloud in the distance, so they knew why the radiation value rose rapidly.

Because the radiation cloud contains various radioactive materials, the closer you get to the radiation cloud, the higher the radiation value.

This is also the reason why Chen Ya speculated that the floating city can shield from radiation.

Of course, the giant walls built in the gathering place are not only to isolate radiation, but also to block the attacks of mutant creatures.

Chen Ya and his friends were lying on the edge of the eaves, their eyes widened, looking at the dim sky outside.

The ground is very barren, almost no grass grows, and the line of sight can only see about three kilometers at most.

More than three kilometers away, there is a haze of nuclear fallout, with little visibility.

Seeing a barren ground with occasional yellow sand swirling, Chen Ya couldn't help but say to himself:

"Is this the wasteland?"

At this moment, in the haze three kilometers away, a terrifying roar suddenly sounded.

Roar! ~

Immediately afterward, a 'strange' feral ghoul emerged from the thick fog.

However, the mad ghoul was red, with a lot of cloth wrapped around his back, and his hands were still tightly tied, and he had a pink balloon tied to his left shoulder and a wooden stick on his right shoulder.

Roar... Roar...

The mad ghoul followed the direction pointed by the wooden stick all the way and went straight to the east wall, which naturally attracted the attention of the guard beside Chen Ya.

In the next second, the guard raised his laser rifle and quickly aimed at the target.

After seeing the appearance of the mad ghoul through the optical sights, the guard couldn't help but wonder:

"Balloons?"

Although there were some doubts, the defender did not hesitate and immediately pulled the trigger.

Multiply! ~

An orange-red ray of light shone through.

The speed of light was indescribable, and in the blink of an eye, the mad ghoul was shot in the head and fell directly to the ground.

At the same time, the guards lowered their guns.

The sharp-eyed Chen Ya, after seeing this scene, immediately felt extremely puzzled.

What happens when a mad ghoul still releases a balloon?

Chen Ya was a little confused, and the four friends around him didn't see it clearly, only knowing that the guards had killed a mutated creature, so they all showed adoring eyes.

Chen Ya also knew the information of the mad ghouls, but the mad ghouls who were killed were obviously different.

This made him feel that it was necessary for him to go over and have a look.

In this way, Chen Ya turned to the four friends and said:

"Shall we go see the mad ghoul?"

"Huh?"

The friends were a little cowardly, but fortunately the guard smiled:

"It's okay, I'll keep you up there."

Hearing this, Big Nose and the others were relieved, and then walked to the elevator with Chen Ya, planning to find the mad ghoul outside the wall to see what the situation was.

Before leaving, the five also saluted the guards:

"Uncle Guard, let's go over and have a look."

"Okay."

The guard smiled and returned the salute, in fact, he also wanted to know why the mad ghoul who had been killed by himself was dressed so strangely, just because he had to perform his duties and he could not leave his post.

……

[PS: Stay up late tonight, probably after the early hours of the morning, there will be an update. 】