For the next few days, Wallen insisted on running at night.

Originally, she wanted to run in the morning, but when she first woke up in the morning, her leg hurt the most, and there was a lot of delay, and she was not good at being late for every experiment, so she decided to run at night first, and then change it to morning when her leg was fully recovered.

After dinner, Chang Hua went directly to the football field.

She ran, he sat and watched, and sometimes he would follow her on foot or in a small circle around the football field to synchronize with her.

The two didn't make an appointment in advance, she ran every day and night, he didn't necessarily arrive every day, and occasionally waited for her on the way back.

The two didn't talk much, and when they calculated carefully, there were no words related to romance and love, but neither of them felt that it was wrong.

Thanks to her persistence, her leg recovered faster than expected, and by the end of the week she was able to walk freely, although it was still a little sore.

During the experiments, they would visit each other during breaks, and she would give advice on their group's experimental circuits, and he would give his own opinions on their group's experimental methods.

The experiment lasted for the third week, and finally came to fruition.

Wang Shaoming held a coin-shaped white round solid object with tweezers, and was very suspicious: "Are you sure this is really a radioactive source, not something that is re-condensed after precipitating with too much sodium hydroxide?"

Yu Yi smiled: "Is it a radioactive source, let's use a counter to measure it?"

In fact, he was sure in his heart that this was not a radioactive source, and there was only a small amount of soil used for experiments, and the radioactive source contained in it should be even less invisible, how could it be as big as a coin.

But Professor Lan didn't say what the radioactive elements contained in the soil were, what the extracted radioactive source looked like, and it took a lot of effort for a few people to come up with such a thing.

"Okay, let's try. Wang Shaoming carefully put the round block on the counter, lest it be accidentally broken.

As the red numbers flashed one after another, Wang Shaoming shouted: "Hell, why is this still a negative number?"

Yes, how can it be a negative number, the other three people are confused, even if there is no radioactive source in the white block, it should not be a negative number.

The four of them went to ask Professor Lan, but Professor Lan didn't explain, and threw the white round back into the solution: "There is still more time, go on!"

There is indeed a lot of time, but the blind man's experimental method like touching an elephant made the four of them a little discouraged.

Wang Shaoming gradually stopped coming to the laboratory on time, sometimes he didn't show up all day, even if others came, his brain didn't know where it fell, let him help hand over something, he could be in the clouds for a long time.

Yu Yi was even more straightforward, said to the three of them, and took his girlfriend out on a trip, ensuring that he would show up after the experiment was completed for a month.

Qin Qin's salary and welfare subsidies have been in place, other experimental projects applied to the department have also been approved, and the materials are in place, she began to work on other experiments, busy day and night, leaving only Volin alone to extract radioactive sources.

The two are in the same laboratory, and they will inevitably discuss with each other, most of the time Qin Qin takes the initiative to discuss with Volin, and Volin is afraid of disturbing Qin Qin's train of thought, so she usually does not take the initiative to disturb.

A few more days passed, and there was still no progress in Warlene's experiment.

Yu Yi has already returned from traveling, and he has stalked and obtained several graduation project experiment reports from his seniors from Professor Lan, and is thinking about how to make an optimal combination to achieve his own experimental reports.

Warlene asked Yu Yi for a report on the senior's experiment, studied it carefully, pondered the results of the senior's experiment, and extrapolated the drug ratio for her own experiment.

Qin Qin secretly reminded Wo Lin: "Professor Lan said that the soil has been left for seven or eight years, and the radioactive activity has long since decayed and become very weak, and the purpose of taking us to do this experiment is only to let us get familiar with and practice the process, and the result is not important, maybe there is no result at all." ”

"Really?" Warleen frowned at the newly picked soil she had received today, and her eyes caught eye on the counter beside her, and she picked up the soil and placed it on the counter.

The red number of the counter flashes and ends up fixed at the same number, not negative.

The two of them exclaimed at the same time: "Why didn't you think of this method before?"

Although the activity of the radioactive source is weakened, it has activity no matter how weak it is, as long as the activity of the radioactive source in the soil on that day is measured, and then the dosage and ratio of the drug are reversed, it is also a method.

As for what kind of radioactive source it is, the content of the soil at that time has been stated in the experiment report of the senior, and then according to their half-life, it is easy to calculate their content in the soil.

With a direction comes momentum, and the two of them are excited to start experimenting again.

Qin Qin and Volin cooperated for a while, and then went to do her own experiments, she still had a lot of projects to do, and she couldn't waste all her time on this experiment.

After dinner, Wallen was about to go for a night run, and the dormitory manager called her to answer the phone.

It was Shao Zuxiang who called: "Xiao Wo, why haven't you come for so long, Rong Rong has accumulated a lot of questions, and seeing that the college entrance examination time is getting closer and closer, you should come over quickly." ”

Warlene explained: "Uncle Shao, I'm sorry, I'm too busy to get out of my body during this time, Rong Rong will not rest tomorrow afternoon, I will ask the teacher for half a day off and go over." ”

To be honest, she didn't forget about tutoring at all during this time, first her legs hurt, and then she and Chang Hua gradually got better, and then the experiment of a group of four became her doing it alone.

Even if she agrees to Shao Zuxiang now, she is not really willing to go to tutoring, and today the experimental method has finally made a breakthrough, and she is planning to do it well.

However, she has been with Shao Rong in high school for three years, and it is only the last two months, so let her accompany Shao Rong to the end.

When Warlene arrived at the football field, Chang Hua was already waiting at the entrance: "Why is it late today, is there something delayed?"

"I answered the phone, I have to go to the tutor tomorrow, and I can't do the experiment tomorrow afternoon. Wallen admits that she is still willing to experiment.

"Do you want me to accompany you?" Haha asked her.

Warlene smiled and refused: "No, it's okay in broad daylight, when I teach girls lessons, parents are afraid of disturbing us, so they generally avoid going out, and you don't feel comfortable staying with a big boy." ”

"Okay, whatever you want. Haha didn't force it, "Then how long are you going to go and come back in the evening?"

The standard time for tutoring is two hours at a time, but if the child has too many problems, Warlene will also extend the class time, and if Warlene used to lecture too late at that house, she couldn't enter the dormitory building when she went back to school, so she made do with Shao Rong for one night.

Wallen shook her head, "It's not certain yet, it depends on how much the girl's questions accumulate." ”

She still wanted to come back to the laboratory in the evening, and after asking like this, she couldn't be sure, if Shao Rong could take a leave of absence during the evening self-study time, she would probably stay for her to answer questions.