. Each of the following isotopes has been used medically for the purpose indicated. Suggest reasons why the particular element might have been chosen for this purpose.
a. cobalt-57, for study of the body’s use of vitamin B12
b. calcium-47, for study of hone metabolism
c. iron-59, for study of red blood cell function
d. rncrcury-197, for brain scans before CAT scans became available
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