English

Radioactivity is known as the particle which are emitted from nuclei when there is nuclear instability. Its components are mainly used in biological and logical research. It is expressed with the unit Becquerel (Bq). Use this online calculator to calculate the amount of radioactivity through entering the mass of element, atomic mass of element and time.

## Becquerel (Bq) Calculation

weight
g/mol
x 1023 mol-1
sec
Bq

Radioactivity is known as the particle which are emitted from nuclei when there is nuclear instability. Its components are mainly used in biological and logical research. It is expressed with the unit Becquerel (Bq). Use this online calculator to calculate the amount of radioactivity through entering the mass of element, atomic mass of element and time.

#### Formula:

Radioactivity = ( Mass of the element / Atomic mass of the element ) x Avagadro's constant x ( ln(2) / Time )

One becquerel (Bq) is defined as the activity of a quantity of radioactive material in which one nucleus decays per second, which is equivalent to inverse of a second, s-1. The SI unit Becquerel is named after Henri Becquerel, who shared a Nobel Prize with Pierre Curie and Marie Curie in 1903 for their work in discovering radioactivity.

#### Example

An isotope with mass 30 g has an atomic mass of 1.23 g/mol and half life time of 5 seconds. What is its radioactivity?
Becquerel = ( 30 / 1.23 ) x 6.022 x e23 x ( ln(2) / 5 )
= ( 30 / 1.23 ) x 6.022 x e23 x ( 0.6931 / 5 )
= 2.0362100500832788e+24 Bq