Question

I could not solve part C.

A radioactive waste from a clinical laboratory contains 0.2 μCi (microcuries) of calcium-45 (45Ca) per litre. The reaction rate constant is 0.005/day. The radioactive calcium waste is treated in a pipe that is 200 m until it reaches below the maximum acceptable radioactivity of 0.01 μCi/L. Assume the pipe approximates a plug flow reactor.

(b) How long (in days) does the radioactive calcium waste need to be in the pipe before the outflowing waste will have a radioactivity less than 0.01 μCi/L?

(c) Calculate the lineal velocity (in m/h) of the radioactive calcium waste in the pipe so that the radioactivity is less than 0.01 μCi/L at the end of the pipe?

Answer 1