A tracer injection system can include a tracer solution, a pump configured to pump the tracer solution, a data transmitter associated with the tracer solution, a data receiver configured to receive tracer characteristic data from the data transmitter, and a pump controller that variably operates the pump, based at least in part on the tracer characteristic data received by the data receiver. A tracer injection method can include associating a data transmitter with a container and a tracer solution in the container, so that the data transmitter is transported with the container and the tracer solution, receiving from the data transmitter data indicative of a characteristic of the tracer solution, and pumping the tracer solution from the container at a flow rate based at least in part on the received data.