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