Respuesta :
Answer:
the reason the doctor would have done this is because once the radioactive isotope hit the blockage it would stop and this type a things transmits radioactive rays that would help the doctor locate it more easily.
Answer:
In the explanation. :)
Explanation
The radioactive isotope hits the blockage so that means it would stop and transmit radioactive rays that would help the doctor locate it.
Hope this helps. Have a great day.