The counselor's questioning pulled Gu Play back from his contemplation.

"Do you still want to hear the details of the principle? Do you want to hear it too?" Gu Yu couldn't help but be a little curious, he always felt that the level of the counselor was enough to listen to the above, as for his classmates, the level was even less enough to understand, and if he said it, he would be listening to fantasy.

Who knows, everyone is very enthusiastic, and several juniors who come downstairs to join in the fun are desperately encouraging Gu to play and talk about specific principles.

In a word, it is to use different atomic weight isotopes in the distribution state, different densities, and then filter them out by the difference in centrifugal force and gravity sedimentation trajectory.

And the electromagnetic ion separator I'm talking about is like this - let's take the C12 and C14 in the title as examples. As we all know, the carbon element is +4 valence after completely removing the surface electrons, that is, a 'carbon ion' with 4 positive charges.

The atomic weight of C12 is 12, and when we pass this +4 C12 through the electromagnetic field at high speed, it will be deflected by the Lorentz force - this is the simplest middle school physics.

The exact amount of its deflection is calculated by dividing the electromagnetic force experienced by 4 positive charges under the magnetic field by the weight of 12 atoms.

At this time, if there is an isotope mixed with C14 in this mass of carbon atoms, then the deflection rate of C14 will be smaller than that of C12, because it needs to remove the atomic weight of 14 with the electromagnetic force of 4 positive charges, and its deflection acceleration can be only 6/7 of that of C12.

In this way, we use multi-stage acceleration, partial bias guidance, multi-stage slit separation, and analysis magnet capture through subsequent complex designs...... Finally, C12 and C14 can be efficiently separated.

Of course, no one in the world has made specific engineering applications, and I can't solve the problem by talking about it. Anyway, this problem is solved. ”

(Note: Theoretically, the carbon element has no ions, and for the sake of convenience, the outermost carbon atom with electrons lost is commonly known as carbon ions.) ）

After Gu finished playing, he also took a piece of paper, wrote and drawn, and wrote down some calculation processes.

After all, this topic is only to demonstrate that "when separating the isotopes of carbon, nitrogen, oxygen, fluorine, and other low- and medium-quality elements, the ion-accelerated electromagnetic separation method is more efficient than the distributed centrifugation method".

Professor Wu didn't say let him build an ion accelerator mass spectrometer.

When Miao Xiaoqin heard this, she was already shocked by Gu Wan, and she asked with some fear: "So ...... If you publish a paper, will someone steal your idea and use it to build a machine?"

Gu Yu smiled generously: "This thing is not difficult, the key is just 'I didn't expect it'." How easy is it for me to build it without a multi-million dollar R&D budget? As for others, without my acumen and talent, I guess they spend more money and time.

The point is that this kind of thing is only meaningful at the level of theoretical derivation, and has no economic value. Because radioactive isotopes, which have nuclear energy value, are either too heavy or too light.

Conventional distributed centrifugation is already highly effective at separating overweight and ultralight elements. The thing I have in mind is just a toy for scientists to show off their skills by separating common elements of low and medium atomic weights that have no radioactive or nuclear value. ”

In Gu Wan's mind, he actually thought of the use of an ion accelerator mass spectrometer, but he kept a hand and didn't say it—he knew that on the earth, the most expensive people who paid for this thing in the early days were the archaeological circles of various countries, as well as the geology and paleontology communities.

The reason is also very simple - C14 isotope determination plays a very key role in the identification of historical sites and ancient biological fossils/geological strata, which can determine the age of certain antiquities through the abundance of C14 and its half-life.

However, even without an "ion accelerator mass spectrometer", C14 isotopes can be separated by traditional centrifugation alone, but the efficiency and accuracy are greatly reduced.

Generally speaking, it is roughly the separation of isotopes by centrifugal method, and the final measured age may have an error of hundreds or thousands of years (with the progress of the times, the accuracy will become higher and higher)

With the "ion accelerator mass spectrometer" for C14 isotope determination, the accuracy can be reduced to at least one or two hundred years, or even decades.

It can also be seen that geology and paleontology, in fact, are not very urgent in need of "ion accelerator mass spectrometer".

The reason is also very simple: geology and paleontology are relatively crude in the study of age. For example, at the beginning, it was said that dinosaurs became extinct 70 million years ago, and later it was accurate to 6700~65 million years ago.

In contrast, only archaeology requires the highest dating accuracy, and whether the remains of a prehistoric civilization are unearthed has a great impact on whether it is 3500 BC or 4000 BC.

It's a pity that the archaeological community is so poor! Who would be willing to spend tens of millions of dollars in scientific research funds to study this machine that improves the accuracy of dating?

Especially in a place where the Blue Hole civilization worships money, everyone's goal for archaeology is to dig up cultural relics and sell them for money, archaeologists are as poor as pants, and each country gives very little money.

……

Gu Yu hid it in his heart and didn't say it, Miao Xiaoqin naturally couldn't know.

So she thought she had done enough homework, and immediately reported Gu Wan's final results and follow-up progress to Assistant Hu after the lunch break.

Assistant Hu didn't dare to slack off when he saw that he had found so many moths after checking the results, and immediately reported it to Dean Ding.

"To make a final exam paper, all of them have made such great ideas and discoveries? When Dean Ding heard this, he couldn't help but praise it for the first time.

In particular, the idea of playing with Gu made Dean Ding feel like a confidant - when Dean Ding was at MIT in Oceania, he studied particle accelerators, but the large elementary particle accelerators were too expensive, and in the end, no country invested in the construction.

The ion accelerator mass spectrometry method mentioned by Gu Wan, although it is the entire charged atom that is accelerated, rather than a single elementary particle such as protons and neutrons, and the speed and terminal voltage that need to be accelerated are not so high, and the difficulty of manufacturing is at least several orders of magnitude lower.

But at least everyone is also "from the same source" and is in the same field.

Therefore, this thing is one step closer to Dean Ding's major, compared to the "atomic fountain" in the cesium atomic clock.

Although only a small step.

Dean Ding seemed to have an illusion in his mind: Could it be that the ultimate elementary particle accelerator that he wanted to build in his life but could not obtain would be broken down into small goals that could make money and attract investment like an earthworm arch stone, and finally be realized?

"Immediately find a way to support this Gu Play and publish the paper. Don't choose our own journal this time, we can't invest in the pearl. If the physics major of the Central University of Science and Technology can be carried forward in the future, it is estimated that it will take a lot of effort to play this role. ”

——

Ps: The spit function has been restored, please complain.

The competition is too fierce, and I can't grab Sanjiang, so I can only lower the update speed, otherwise I may have to go to the shelves, and I want to kneel and beg to be dragged to the shelves on October 25th.

Kneel and beg everyone to be patient. The threshold for this book is too high, it's not easy.