# How do you use becquerels (the unit)?

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Are they like moles, say:

“The molar mass of [insert element] is [insert number] amu.”

v.s.

“1 becquerel of [insert isotope] is [insert number] grams.”

In: Chemistry Yes. Becquerel measure the activity of a radioactive element, that is “Decay events per second”. Since the number of decay events per second is only dependent on (material) constants (half Life, avocado number, atomic mass) and the amount/mass of substance, the Bq of a sample and it’s mass, given you know what element the sample is made of, can be directly converted into each other. The full equation goes

A_Bq = nN_A ln(2)/t_1/2 = m/m_a N_A ln(2)/t_1/2

Where A_Bq is the activity in Bq, N_A the avocado constant, t_1/2 the half Life and n = m/m_a is the molar number, with m being mass and m_a atomic mass. Therefore the mass of a sample given a known activity is

m = (A_Bq m_a t_1/2) / (N_A ln(2)) bequeral means the number of disintegrations per second (s^-1), you’d use it in reference to the activity of a radioactive isotope