Calculate the absorbed dose to the lungs from the administration of 4 mci (148 mbq) 99tc particles, assuming that 99% of the particles are trapped in the lungs. The value of mean absorbed dose per cumulated activity (s) for the lungs is 5.2x10-5 rad/ci.H. Assume that the 99tc activity is uniformy distributed in the lungs and 455 of the activity is cleared from the lungs with a biological half life of 3h and 55% with a biological half life of 7 h.
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