How did you, a prisoner on death row, become an important weapon of the country? Yecheng Gao Weiming

"Depend on...it?"

This touched upon Zhang Lianhai's blind spot in knowledge.

As far as he remembered, didn’t Longguo acquire the X-ray machine after it was established?

How come so many big guys can survive by relying on this thing?

While taking a break, Matthew couldn't help but show off to Zhang Lianhai.

"In 1896, the first X-ray machine was introduced from Siemens and quickly attracted worldwide attention."

"It is not only used in medicine, but also has become a fashionable trend in high society."

"At that time, many wealthy people were keen on taking X-rays to see the structure of their bodies."

"Some people are even addicted to X-rays, to the point where they feel uncomfortable if they don't take one every day."

“Of course, people back then didn’t realize the dangers of X-rays!”

"The radiation emitted by X-ray machines at that time was hundreds of times higher than that emitted by today's X-ray machines."

"It was not until more and more people died of cancer that people began to take the dangers of X-rays seriously."

"But that's all later! Twenty years after the first X-ray machine was invented, almost every developed hospital in the world had it."

"And your Dragon Country's first X-ray machine was obtained by Li Hongzhang during his visit to Germany."

"In the 1930s, the war became more intense, and the leaders of your Dragon Country were often injured on the battlefield. After being injured, they encountered a difficult problem: due to technical limitations, the shrapnel could not be removed."

"This made the person in charge of health care at the time very anxious. He asked around and finally asked someone to buy an X-ray machine from Siemens. After it was transported to Longguo, in order to get it smoothly, he even disguised himself as a funeral procession and secretly brought it back."

"If I remember correctly, it's the model in front of us!"

“Its arrival allowed surgeons to successfully treat several big men, allowing them to return to the battlefield and make great contributions to the future establishment of the Dragon Kingdom.”

"Until now, that X-ray machine is still preserved in your Dragon Country's museum. Haven't you seen it?"

Faced with Matthew's question, Zhang Lianhai's face turned red.

He really hasn't seen it before.

After all, medical physics, a niche subject, has not received much attention in the country.

The physicists in Longguo are too busy developing military technology and chip technology to have the time to deal with these things.

But if you don’t understand, you should ask. Zhang Lianhai smiled and shook his head.

"I really don't know, Brother Xiu! If you hadn't told me, I would have thought that the first generation X-ray machine was an extremely heavy thing. I didn't expect that one person could lift it with a lot of effort."

"Hey, tell me quickly, how does this thing work?"

Only by understanding its working principle can Zhang Lianhai perhaps infer its key role in this challenge.

Seeing that the other party was not ashamed to ask, Matthew's smile became even wider.

Depend on!

Finally, I have room to perform.

He continued:

“The principle is simple!”

"We all know that matter is made up of molecules, molecules are made up of atoms, and atoms are made up of nuclei and extranuclear electrons."

"If a high-speed electron shoots into an extranuclear electron outside the nucleus, the energy it brings will break the original energy balance."

"In order to reach a new balance, the excess electrons will begin to jump to the next level. During this jump, energy is continuously released in the form of a spectrum. This released substance is X-rays, also called electromagnetic radiation."

"It is a kind of ray with extremely high frequency, extremely short wavelength and great energy. After Mr. Roentgen discovered it, he deduced and made the X-ray machine."

"look……"

Matthew pointed to a black box and said, "It contains a vacuum diode. It has two electrodes, the cathode and the anode. The cathode is the filament that emits electrons, and the anode is the target that receives electron bombardment."

"When a large amount of current enters the cathode filament, the filament begins to heat up very quickly, and the solid material covering it begins to overflow. If at this time, the anode on the other side has a high enough positive voltage, the electrons in the cathode will be attracted and collide with the anode at high speed, and X-rays will be generated.

"Then we pipe it into this camera-like thing and it shoots out through the lens."

"After aiming it at a certain part of the patient's body, place a piece of developing paper behind it!"

"This is it……"

Matthew picked up some more X-ray film from the box.

But it is obvious that the film from the early 20th century was smeared with some unknown substance, which made it wet, slippery and sticky.

"After X-rays penetrate the human body, they project a clear image onto the developing paper. After being soaked in the developing solution, the image will appear clearly. Its overall principle is similar to that of a camera, except that it has a large amount of radiation..."

Following Matthew's description, Zhang Lianhai nodded continuously, and he seemed to understand the principle of this old-fashioned X-ray machine.

He is not Song Xiaocheng. He is also an excellent student in physics. He learns very quickly by analogy.

"So! As long as we plug in this plug and control the current, the cathode filament will start to heat up. When it heats up to a certain degree, we can start the machine?"

Zhang Lianhai raised the plug and asked a question: "How long does it take to take an X-ray?"

Matthew was stunned for a moment, then smiled bitterly and said, "With our modern X-ray machines, it takes about 15 milliseconds to take a picture. This means that the picture is taken after the human body senses a very small amount of radiation."

"When the X-ray machine was first invented in 1896, it took about 90 minutes to take an X-ray..."

"ah!???"

Zhang Lianhai looked confused.

90 minutes of high-intensity radiation?

Don't be so annoying.

Who can withstand this radiation dose?

No wonder so many people died of cancer due to excessive radiation in those years.

After all, radiation does not cause any pain when it is produced. Only the cells in the body know that they are suffering a devastating disaster.

Also.

It takes 90 minutes to take an X-ray. What's the point of it?

There are less than 60 minutes left until the end of the challenge, and not a single X-ray can be taken.

The surgeon and the anesthesiologist died again. Was everything in vain?

Just as Zhang Lianhai was cursing inwardly, Matthew quickly added a sentence.

"Don't... don't get me wrong! Lian Haier, this is Siemens' fourth-generation product, which greatly shortens the exposure time."

"Otherwise, how could those seniors from your Dragon Country endure 90 minutes of continuous exposure?"

"This X-ray machine only needs 20 seconds of continuous exposure to produce an image on the developing paper..."

"I see!"

Zhang Lianhai breathed a sigh of relief and slowly closed the lid of the wooden box.

"Then let's..."

He stood up, lifted one end of the wooden box, and spoke in a deep voice.

"lets go!"

"Forehead……"

Matthew looked at Zhang Lianhai with a puzzled expression and nodded heavily.

"set off!"

A good show seems to be beginning.