How to detect whether the radioactivity of marble exceeds the standard?

As early as 1993, the national building materials administration issued the classification and control standard for radioactive protection of natural stone products, which classifies natural stones according to the radioactive level and divides them into class A, class B and class C. Class a products can be used on any occasion, class B products can be used for the internal and external finishes of all buildings and industrial facilities except the interior decoration of the room, and class C standard stones can only be used for the external finishes of buildings.

According to our test and analysis of nearly 200 samples, 80% of the stone samples belong to class a stone, and marble belongs to class a stone, which can be used in any occasion. The radioactive content of some stones is very low, even lower than that of ordinary cement floors and bricks. Using this kind of stone indoors can play a shielding role, reduce the total indoor radiation and play a role in environmental protection.

Many people are concerned about how to detect whether the marble in the room exceeds the standard. It is understood that the traditional test methods are mainly indoor gamma ray spectrum analysis and radiochemical analysis. Test samples shall be ground and sealed. The analysis cycle is about 20 days, and the analysis cost is high. In view of this situation, with the support of the national stone quality monitoring center, China University of Geosciences (Beijing) applied geophysics and China Stone Industry Association jointly developed the first stone radioactivity detector and its related measurement methods and technologies, which passed the expert appraisal of the state building materials administration and obtained the certificate issued by the Beijing Municipal Bureau of quality and technical supervision.

The detector's instrument is like a flashlight with a small display outside. This portable instrument can be brought to the site for testing without damaging the finished product. It can be tested directly on finished products. The test range is 50 × 50cm, short test time, generally about 10 minutes.

Finally, the family environment is a whole. As long as the radioactivity index in the environment meets the standard, it will not affect the human body. Don't dismantle blindly because you are worried that the radioactivity of certain materials exceeds the standard, resulting in unnecessary waste and trouble.