the number 137 appears in various situations.


in mathematics, 137 is a prime number.

in the periodic table, Cs 137 can be found.

in physics, we have the fine-structure constant, 

~ 1/137.


the formula converting becquerel into Sv is

x[mSv/year] = m[kg] × a[Bq] × 1/137.

where x is the annual radiation dose,m is the mass of radioactive material,

a is the activity of a quantity of the mass. 

the age of our universe is around 13.7 billion.

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