The radiation dose rate of marble is in the range of 0.23μSv/h, above which the radiation is high, and below which it can be ignored. At present, the marble sold in the market can meet the standard after national testing.

At present, the decorative stones are mainly granite and marble. Granite is more radioactive than marble and is not suitable for indoor use. Marble is divided into natural and artificial. Artificial marble is made of natural marble or granite crushed stone by stirring, molding, grinding and polishing.

Generally speaking, the specific activity of marble is low, which is not a problem worthy of attention. According to the test data of Geological Exploration Center of National Building Materials Bureau and Industrial Hygiene Laboratory of Ministry of Health, the specific activity of granite stone is higher than that of marble and slate, and its radiation is stronger. Judging from the color of stone, the specific activity of granite is white and black.