Which of the following might be considered a viable application of a radioactive tracer? it can be more then one?
a) adding a stream of radioisotopes to waste water to examine where pollution goes when it flows into the
ocean
b) embedding a radioactive plug in a valuable necklace so that its location can be determined using a geiger
counter
c) placing radioactive sources around a room to trace the location of people as they move through the room
d.) filling a pipeline with radioactive gas to see if it contains any leaks

answer; /// i believe that the correct answer is (c)

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