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Since the beginning of development in the 1950s, atomic clocks have been based on the hyperfine transitions in hydrogen-1, cesium-133, and rubidium-87.
en.wikipedia.org Indirect detectors contain a layer of scintillator material, either gadolinium oxysulfide or cesium iodide, which converts the x-rays into light.
en.wikipedia.org His primary concern is dealing with the terror threat associated with the stolen cesium.
en.wikipedia.org The measurement was made after a beam of cesium atoms was used to remove the upper 20 nm of the wafer.
en.wikipedia.org Among the most stable frequency references in the world are cesium standards, including cesium fountains, and hydrogen masers.
en.wikipedia.org