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How does stone’s natural radioactivity compare to background levels?
Stones and minerals often contain trace amounts of radioactive elements like uranium, thorium, and potassium-40, which emit low levels of radiation. But how does this compare to the natural background radiation we encounter daily?
Background radiation comes from cosmic rays, soil, and even the air, averaging about 2.4 millisieverts (mSv) per year globally. Some stones, such as granite or certain types of shale, can emit slightly higher radiation due to their mineral composition. For example, granite countertops may add a negligible 0.1 mSv annually—far below harmful levels.
Highly radioactive minerals like autunite or torbernite are rare and usually found in controlled environments. While their radiation levels exceed background rates, handling them briefly poses minimal risk. Prolonged exposure, however, could be hazardous.
Most everyday stones pose no significant radiation threat. Always consult experts if unsure about a mineral’s safety. Understanding these differences helps dispel myths and promotes informed decisions about natural materials.
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