Wlrun 3, thanks for that sourcing. I'll have to take a look at it, although I do have a preference for Gollnick. While we are tracing ourselves back to our roots in this problem, my conversion was taken from Tom Voss's "Radiation Measurement & Protection Notebook" as distributed by Thermo Electron Corporation. I used it as it fits in my pocket and is good here in the field. The numerical value that I used was based on the GBq/g formulation of 1.324E7/(t1/2 x atomic mass). I didn't go the rest of the way, as I don't do others' homework for them. My kids used to complain about that also. However, as I used to explain to them, my ego is big enough without having to be right about this too!
I blew off the animal mass and associated assumptions as superfulous data designed to confuse the student. The activity of the injected solution has nothing to do with these. It is activity/g and matters little how many grams of solution nor of the area the injection affects. Should the problem have stated a time line post needle insertion, and sought an answer for the radiation dose to tissue or concentration in the animal system,then the other data may have been pertinent. I didn't see that in the problem and so I didn't address it in my reply. Sorry, Juli. I'll buy you a coffe to make it up to you.
