Cesium-137 has a half-life of 30 years, which means that two centuries later, the blocks will still be glowing with 1% of their original radioactivity. Since the color of the light depends only on ...

The Norwegian Radiation and Nuclear Safety Authority (DSA) has discovered traces of radioactive Cesium-137 near the Russian border in Svanhovd and Viksjøfjell. The level of radioactive isotopes ...