Question

1 GBq of a 99mTc tagged colloid is injected into a patient to visualize the liver, the mass of the liver is 2.0 kg. around 4% of the injected activity is deposited in the liver. The biological half life of 99mTc in the liver is 3 days whereas its radiological half-life is 6 hours. Assuming all of the 99mTc decays by 141 KeV photon emission. What is the instantaneous absorbed dose-rate to liver in mGy/hr

Answer 1

Committed equivalent dose can be calculated using the equation,

wR for 141keV photo emission is 20 and DT,R is the absorbed dose in rads.

Committed effective dose can be calculated using the equation,

wT for liver is 0.05.