A radiation oncologist treats cancer with two species of radioactive nuclei, X and Y. The initial number of nuclei for each species (at t = 0) is No. Att = 100 s, the oncologist observes that Nx = 100 Ny. If Tx = 2 Ty, the value of Tx (in s) is: (Recall that t = (1/x) and 1 Ci = 3.7 x 1010 Bq)
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