Fortunately, twelve people can't use much oxygen, Ye Han provides three pieces of oxygen ice every day, the second team can't use it up, and there is still a balance of half an oxygen brick, and the oxygen ice made by the three groups in one morning is enough for the two teams to breathe for three days, and it does not affect the progress of the investigation. Pen? Interesting? Pavilion wWw. ｂiquge。 ｉｎfo

When the second team was busy building the base, the investigation work of the third group had already been carried out, and there was no need to add people to the third group, Ye Han was busy for half a week, and finally completed the investigation work in the lake area.

After more than 20 days of uninterrupted work, a large number of first-hand information was obtained from large-scale sampling and analysis, and the three groups determined that the crater was a super-large crater lake.

Although there is no time to investigate the detailed thickness of the ice layer, the impurity content of the ice sample can be used to approximate the ice condition at the sampling site.

About 60% of the ice in the glacial lake contains more impurities, and Ye Han et al. believe that the ice in such areas is thin. There is no basis for such a judgment, but everyone thinks that most of the impurities in the ice are the result of the boiling water of the lake that brought the sediment to the surface during the impact countless years ago.

The three groups did not care about the thickness of the ice, but Ye Han found in the investigation that the ice ore containing a lot of impurities is not only of poor quality, but also contains a certain amount of radioactive substances in the impurities.

Ye Han was shocked into a cold sweat, and couldn't help but be glad that the living cabin had been using circulating water.

Circulating water is just psychologically uncomfortable, but radioactive water is directly fatal!

Although the surface of the moon is not really cosmic space, the environment is basically the same, and radiation is everywhere, so the lunar ice cannot be compared with the earth's ice at all!

The vacuum on the moon, extreme heat and low can kill people invisibly, but the most dangerous thing is not the extreme environment, but the radiation from the universe!

Earth's magnetic field protection, which can block deadly rays and protect the earth's biosphere; Whether it is Tiangong or the International Space Station, although it is located in outer space orbit, the orbital altitude does not exceed the protection range of the earth's magnetic field and is in a safe position.

But the moon, which is 380,000 kilometers away, has long been protected by the earth's magnetic field, and the magnetic field of the moon itself is pitifully weak, and the moon is naked in front of the vicious solar storm and cosmic rays as if it has no clothes.

High-energy particles from space can penetrate the human body, damage DNA, break the gene chain, and increase the risk of cancer and other diseases, so all humans operating on the surface of the moon must take precautions.

The moon spacesuit weighs five times the weight of an astronaut, and the design is far from as simple as increasing the weight to ensure health, and the vast majority of the weight comes from the protective layer in the spacesuit.

In the eyes of ordinary people, there is no need for a protective layer that is too thick, and in fact it is true, it does not need a too thick protective layer to protect ordinary cosmic rays.

But nothing is certain, and radiation from distant supernovae is not so simple, containing heavy metal ions with a speed close to that of a beam, that is, the nucleus of an atomic element after it has lost its outer electrons.

If this thing is assembled into a bundle, the power is equivalent to that of an ion cannon in science fiction, but those who have studied physics know that the same sex is repulsive, the nucleus is positively charged, and the repulsion will separate the metal ions, so there will be no situation where a large number of metal ions bombard a position at the same time

If the problem of same-sex exclusion cannot be solved, the so-called ion cannon can only stay on paper forever!

The danger does not only come from the universe, but when the particles in the cosmic rays hit the surface of the moon, they will trigger a miniature nuclear reaction and produce a large number of dangerous secondary particles, so that the surface of the moon is always radioactive.

From the sky to the ground, the damage of the moon to human beings is all-round, and it can even be said that the moon is full of malice towards human beings, not to mention the construction of a lunar base, even if it appears on the surface of the moon, it is full of danger.

The reason why the temporary base is placed in the crater is also due to safety considerations, after all, there is a mountain inside the crater, and the cosmic radiation it receives is always smaller than that outside the mountain.

It's not too late to make amends.

Ye Han began to pay attention to the radioactivity of ice mines, and the results not only proved the view that there are many impurities and poor quality, but also found that the closer the ice sample is to the surface, the stronger the radiation, but the radiation of the ice sample taken out ten centimeters below the ice surface in the thick ice area is extremely weak, which meets the safety standard of drinking water. Ice samples taken below 20 centimeters below the ice showed almost no detectable radiation.

Ye Han and others believe that this is because there is no atmosphere on the surface of the moon, and the surface of the glacial lake is in direct contact with the universe, and it is normal for the lunar soil and lunar dust covering the lake to be contaminated with a little radioactive material, and only the surface of the glacial lake is lightly polluted.

When formulating the Moon Palace plan, the problem of radiation protection in the lunar base has been rigorously demonstrated, and water safety is also among the arguments, and the water treatment device in the temporary base has the ability to remove radioactive contamination from the water body, but it is more troublesome to deal with, and there is a safe ice mine, which is much easier than staring at the water treatment device from morning to night, and the water supply efficiency is not the same.

The radiation situation of the ice mine is only a by-product of the investigation mission, and it is an unexpected gain of the investigation mission, but this result is of great significance to the Moon Palace Project, and even fundamentally solves the problem of water use in the base.

Not only now, but also in the future!

The results of the survey look a bit backwards...... Heavy water is a nuclear raw material and a very important strategic resource, but the question is, no matter how important the resource is, can it be heavier than water resources?

In this regard, the results are more important than the survey itself.

Of course, the heavy water investigation did not relax, but the results surprised everyone, and most ice samples did not find heavy water at all, even those that were severely radioactive.

When Ye Han's sampling points were marked on the map one by one, it was immediately found that all the heavy water collection points came from an area directly south of the temporary base, which was temporarily designated as a heavy water area by Ye Han.

The heavy water area is an irregular circular area, the north edge is more than 500 meters away from the temporary base, the center is 3.6 kilometers away from the base, and the entire heavy water area covers an area of nearly 30 square kilometers.

The highest ice content came from 4.5 km directly south of the temporary base, reaching a record 9.5%!

When the results came out, Xu Hua thought that the testing equipment was malfunctioning, and after repeated tests with different water samples, he had to accept the results.

Immediately, this ice sample caused a sensation throughout the base, and when the satellite flew over the base again, the news caused a sensation in the entire ground command center.