How is the year of Dzi beads calculated?

The real Dzi beads are made of Jiuyan shale. Jiuyan shale is mainly composed of silicon dioxide and accompanied by iron oxide. Agate, crystal, basalt and quartz have been transformed over thousands of years. Due to changes in pressure and temperature, it becomes harder and penetrates into it. After being washed by underground rivers and eroded by other elements, many brightly colored, strong color contrast, and exquisite patterns of money and eyes are formed on the leather shell. The local people Commonly known as "money stone" and "sky eye stone".

The year is determined by looking at topographic maps, analyzing the age of the strata, and identifying the stratigraphic soil composition and C14 index of the rocks.

Each radioactive isotope has its own certain rate of decay, which is called the "half-life" - the time it takes for half of the number of atoms of a certain substance to decay. Therefore, if we know the half-lives of various isotopes, it is not difficult to calculate the age of an object containing that isotope, simply by measuring how much of the isotope is left.

Argon is the decay product of the radioactive isotope potassium. Now that the half-life of this isotope of potassium is known to be 1.3 billion years, it is easy to determine the age of the specimen. At present, this method has been developed to be extremely sophisticated, and it can identify specimens that are only about 50,000 years old, as well as specimens that are the same age as the earth, with very small errors.