Radiation Measurement

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One treatment for bone pain involves intravenous administration of the radioisotope phosphorus-32, which is incorporated into bone. A typical dose of 7 mCi can produce up to 450 rad in the bone.

a) What is the difference between the units of mCi and rad?
b) What is the absorbed dose of radiation in grays (1Gy)?

The millicuries (mCi) indicate the activity of the P-32 in terms of nuclei that break down in 1 s. The radiation absorbed dose (rad) is a measure of