Average Dose Rate of 1.11x108 Bq 131I in Thyroid

[xamy]

Homework Statement

A patient receives an injection of 1.11×108 Bq of 131I,30% of which goes to the thyroid, having a mass of 20 g.What is the average dose rate in the organ?

Homework Equations

D=1.60×10–10AE Gy s–1

The Attempt at a Solution

A=(1.11x108x(30/100))/20=1.665x106Bqg-1

E=0.192Mev

=1.60x10-10 (1.665)(0.192Mev)

= 51μGy s–1

This is my solution. Can anyone point out the mistake here.

 

[gleem]

=1.60x10-10 (1.665)(0.192Mev)

What happened to the factor 10^6 you had in calculating A?