72.正子核種中,下列何者的正子產率%(positron yield)最低?
(A)11C
(B)13N
(C)18F
(D)68Ga
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統計: A(77), B(110), C(305), D(764), E(0) #3283032
統計: A(77), B(110), C(305), D(764), E(0) #3283032