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A 85kg patient swallows a 30 microCi beta emitter with a half-life of 5.0 days, and...

A 85kg patient swallows a 30 microCi beta emitter with a half-life of 5.0 days, and the radioactive nuclei are quickly distributed throughout his body. The beta particles are emitted with an average energy of 0.35 MeV, 90% of which is absorbed by the body.

What dose equivalent does the patient receive in the first week?

I feel like I'm close, but I'm still not getting the right answer. The answer is in mSv.

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