"the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium
133 atom." 
The main improvement in caesium
clock accuracy has been achieved through the use of laser-cooled caesium
atoms in laboratory clocks known as 'caesium
However, while metals such as lithium, sodium and potassium caused blue fluorescence, its reaction with caesium
produced a distinctive green fluorescence.
It was the first time excessive levels of radioactive caesium
have been found in meat, according to a Tokyo official.
Chemicals in the colouring latch on to the caesium
, extracting the metal from the soil.
This comparison with caesium
results will be made first for the upper, uniformly convex, parts of the opposing slopes, and then for the lower half of the sub-catchment adjacent to the drainage flow line which divides the sub-catchment into its north and south facing slopes.
The main contaminants, Caesium
137 and Strontium 90, will take some 600 years to decay.
Under Japanese Food Sanitation Law, 5,000 becquerel per kg (Bq/kg) of caesium
is considered the safe limit in soil (caesium-137 makes up about half of total radioactive caesium
The authorities of Japan found tea leaves originating from Shizuoka not compliant with the Japanese action level of 500 Becquerel (Bq) per kilogramme for caesium
, which is also the EU maximum level.
Washington, Aug 27 (ANI): A caesium
fountain clock that keeps the United Kingdom's atomic time is now the most accurate long-term timekeeper in the world.
At present, Caesium
fountain clocks are the most accurate clocks in the world, furnishing the second accurate to 15 places after the decimal point.
The problem of contamination due to fallout from the Chernobyl accident is not going to go away as radioactive caesium
has a half-life of thirty years.