Ask, the general strength of the sandstone radiation is what kind?
Table 1 Comparison of the content of radioactive elements in various kinds of natural stone and the average content of crust (unit: Clark)The average content of radioactive elements in the earth's crust (Clark value: weight percent) the average content of igneous rocks and metamorphic rocks
The color is mainly granite, granite in alaskite. Alaskite is generated at a later stage of magma condensation, its main ingredient is silica (Si02, i.e., quartz) in the rocks up to 73-77%. The stage of the formation of the rock (i.e., the later stage of magma condensation) is also the phase of the relative aggregation of uranium, thorium, rubidium, cesium and potassium. Because of all the elements (including radioactive elements) distributed in the earth are very uneven, if encounter radiation element distribution in an area relatively slightly more (known as "geological background high"), then this region produces the alaskite radioactive radiation may be too large.
Red granite, potassium mineral potassium feldspar is the main component of the red granite, while the potassium isotope potassium -40 (40K) itself is a radioactive element. So the more potassium minerals (light pink, pink, etc.), the more likely the radiation intensity (large). In addition, in the red granite, including the granulite and granite gneiss. In this ancient rocks dating back three billion years ago generation, not only containing potassium feldspar, and sometimes with a beautiful color (purple, purple red sauce, etc.) special mineral zircon (Zr-Si04). Chromium mineral is often mixed with radioactive elements such as uranium and thorium, which makes the red granite more colorful luxury at the same time, along with the radiation intensity also increased, this is the famous "India red" and "South Africa red radiation intensity is too large (high) reason.
