This is the second part of the problem so i mention here part a first
the isotope 131I has a half life of 8.07 days and undergoes beta decay with an energy of 9.36 x 10^7 kj/mol.If a patiet with a thyroid disorder is given this isotope and 7.45 pg is incorporated into thyroid gland, how much energy will the gland recieve in one day?
this is 4.4 x 106-4 J and i know how to calculate this
but i want help with part b which is
how many beta particles are emitted per second by the dose of 131I
and the answer is 3.41 x 1064 beta/sec ..but i don't know how to get this answer