A 1.90-kg tumor is being irradiated by a radioactive source. The tumor receives an absorbed dose of 18.0 Gy in a time of 9.00 x 102 s. Each disintegration of the radioactive source produces a particle that enters the tumor and delivers an energy of 0.450 MeV. What is the activity AN/At (in Bq) of the radioactive source? Number Units >

A 1.90-kg tumor is being irradiated by a radioactive source. The tumor receives an absorbed dose of 18.0 Gy in a time of 9.00 x 102 s. Each disintegration of the radioactive source produces a particle that enters the tumor and delivers an energy of 0.450 MeV. What is the activity AN/At (in Bq) of the radioactive source? Number Units >