Interesting Engineering on MSN4mon
Radioactive Cesium-137 found near Russia, raising fears of Oppenheimer-like nuclear testThe Norwegian Radiation and Nuclear Safety Authority (DSA) has discovered traces of radioactive Cesium-137 near the Russian ...
The definition of the hyperfine transitions of cesium was — by international agreement — 9,192,631,770 Hz. A 5 MHz crystal oscillator generates a signal that is modulated by a 137 Hz signal.
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