Proton source medical equipment

Charge q = it = 1×-3c per second when protons hit the target.

The electric quantity of each proton is e =1.6×10-19c.

Then the number of protons that the proton stream hits the target per second n=qe= 1× 10? 3 1.6× 10? 19=6.25× 10 15.

So the answer to this question is: 6.25× 10 15.