Warlene climbed to the laboratory with great difficulty, and Professor Lan had already told Qin Qin, Yu Yi, and Wang Shaoming about the method of extracting radioactive sources from a solution of nitric acid dissolved in soil with sodium hydroxide, and she had repeatedly explained it.

Seeing Wallen gasping for breath and entering the door, Professor Lan hurriedly asked Wang Shaoming to move a chair for Wallen to rest.

"Thank you, Professor Lan," Warlene grinned and sat down, only then did she thank Wang Shaoming, "Thank you, don't worry about me, you go get busy first." ”

"No thanks," Wang Shaoming smiled evilly, "It is the duty of every citizen to take care of the old, weak, sick and disabled. ”

As soon as I heard this, I knew that this guy didn't listen to Teacher Yin's explanation well, and listened to her and Chang Hua with his ears pricked up, or the tone was exactly the same as Chang Hua, or he said that he was not imitating, and the ghost believed it.

"Okay, Wallen wasn't here just now, I'll talk about the method again. Professor Lan spoke Mandarin in a thick dialect.

"No need," Wang Shaoming wailed, "Professor Lan, can you tell Warlene that the three of us will start first?"

Professor Lan refused: "No, you are a group, it must be carried out simultaneously, the experimental medicine is quite rich, but the soil can be used a little less, it can't be wasted, a lot of soil was consumed last week, today I will only take it for you, and four people will use one share." ”

"Oh, okay. Wang Shaoming shut up.

Qin Qin and Yu Yi were a little helpless, but they also had to listen, Professor Lan's perseverance was not something that ordinary people could shake.

Wallen was eager to say to Professor Lan that there was no need to explain it, you had already talked about the experimental method many times last week, and we were already familiar with it, but it was just a matter of thinking about it, and there was a chance that Professor Lan would have wanted to talk about it again, and her arrival gave Professor Lan an excuse.

In this explanation, Professor Lan gave a demonstration at the same time, which was more attractive than just saying that he would not practice, and even Wang Shaoming listened carefully.

The soil used in the demonstration process is still taken from the outside.

Professor Lan said that the soil in the storage room was occasionally found and brought back by the former seniors, who were under construction at the time, and when they went back, they could no longer get soil samples.

That is, these soils are used a little less, and there is no source of replenishment.

The remaining soil will be reserved for future students to use for experiments, so from today onwards, a limited amount will be used.

Although the experimental method is explained very clearly, only an experimental result is given, but the drug ratio is not mentioned, and the drug ratio needs to be summarized from the experiment by the person who did the experiment.

If you are told about the drug ratio, what is the difference between it and imitating the teacher in middle school, and what is the meaning of this so-called experiment?

Professor Lan took out a piece of soil from the storage room and gave it to four people, and the four of them divided the soil into eight small parts, each of them used one copy first, and under the guidance of Professor Lan, Professor Lan mainly inspected and supervised the safety issues.

Except for Wang Shaoming, who went wrong during the experiment and almost dripped nitric acid onto his legs, the other three were only pointed out by Professor Lan to pay attention to.

After Professor Lan left the laboratory, Wang Shaoming was forced by the other three to do another experiment alone, and the eyes of the three of them were like searchlights, and they did not leave Wang Shaoming for a moment, which made Wang Shaoming nervous, and almost used nitric acid as water.

"As for my grandfather, you should make a record. Yu Yi immediately made a decision and stopped Wang Shaoming's next step.

Volin and Qin Qin were also frightened, if they really used nitric acid as water, they didn't know how big it would be.

"I'll just say that I don't have a talent for chemistry, and you have to let me do it, and now you dislike me again. Wang Shaoming's big fat face was full of grievances, and those who didn't know thought that the three of them were bullying him hard.

There were still three pieces of soil left, and Yu Yi, Volin, and Qin Qin discussed working together to do experimental exercises.

The experiment is simple to say:

The first step is to dilute the nitric acid solution first, and then dissolve the soil into the diluted nitric acid solution;

In the second step, the solid residue in the solution is filtered out, and the sodium hydroxide solid is put into the solution to make the nitrate and sodium hydroxide have a chemical reaction;

The third step is to take out the radioactive material generated, put it in the dryer to remove the water, and then put it on the counter to measure the radioactive activity.

In three experiments, the three of them experienced one of the three steps.

During the whole experiment, Wang Shaoming only needed to sit there and record the data on the form.

Experimentation is easier said than done, but actual operation time is another matter.

Except for a lunch and a rest, the rest of the time the four of them were doing experiments, until the laboratory building was about to close in the afternoon, three parts of soil were also used up, and no solid materials were produced.

"Oh mom, it's more tiring than a day of physical work. Wang Shaoming pounded his fat waist, shook his head and sighed.

Yu Yi scolded with a smile: "You kid is lying there snoring, you can't wake up with kicking, we haven't shouted tired yet, you shouted first." ”

Wang Shaoming quibbled: "I didn't fall asleep because I was nervous, the bystanders were more attentive than the on-site operators." ”

Qin Qin came up with an idea: "It's okay, aren't you unable to wake up, let's change the method tomorrow, drop some nitric acid on his fat, test how much nitric acid can burn through his fat, and by the way, see how thick his fat is." ”

Wang Shaoming jumped to his feet: "I said Qin Qin, my brother usually takes care of you, how can you come up with such a bad idea." ”

Qin Qin laughed: "Isn't there anything I can't do, who made you snore so much that we can't concentrate." ”

"Yes," Yu Yi coaxed, "Dead Dao friends are not dead and poor, instead of being disturbed by you and unable to concentrate, it is better for you to experience the feeling of being burned with nitric acid, anyway, you almost did this thing today, we are here to help you complete the unfinished business." ”

"Ahh ”

"Poof-" Wallen smirked, with a bitter look on her face, "you guys play with yours, don't come and tease me." ”

After a busy day, she forgot all about the pain in her legs, and when she went down the stairs, Wallen felt that her legs were stiffer than they were in the morning.

I had the heart to jump down step by step with my hand on the handrail like in the morning, and I found that my wrist was sore, and I didn't dare to use it at all.

Originally, the other three people could divert her attention from always paying attention to her legs, but now Wang Shaoming pulled her into the topic, and she felt more uncomfortable in her legs.

"Come, brother carries you. Wang Shaoming squatted in front of Wo Lin very angrily.

Warleen postponed: "I'll go by myself, it's better to move my legs faster, you guys go first, or the canteen will be out of food for a while." ”

"If there is no food in the cafeteria, you can invite us to eat," Wang Shaoming smiled, "Brother will carry you directly into the restaurant." ”

"Smack!" Yu Yi slapped Wang Shaoming's flesh on the back and scolded with a smile, "If you are still thinking about going to the restaurant, you are not afraid of bursting your flesh." ”

Turning his head and persuading Volin: "You're welcome, we can't leave you alone, besides, he didn't do anything but sleep, you don't let him carry it, it's too cheap for him." ”

Warlene was a little embarrassed, since she was a child, except for her father and brother, she hadn't let other boys carry it, it was too embarrassing.

She was still hesitating here, because the tonnage was too large, Wang Shaoming's legs were sore after squatting for less than half a minute, and she stood up: "Brother, I'll still use you as a crutch." ”

Stretched out his arm to Warlene: "Queen Mother, let's drive the rice dumpling restaurant?"