Patent ID: 8113279

Claim:
An apparatus for instantaneously injecting a tracer to a groundwater well, comprising: a bi-directional piston with one end receiving a piston shaft moving up/down; an upper plate connected to a lower end of the bi-directional piston; a lower plate spaced apart from the upper plate at a predetermined distance to form a space and connected to the upper plate through a number of connection rods; a container with one end fixedly connected to the piston shaft within the space and the other end being opened and hollow; a tracer injection rod fixedly installed at the lower plate in a perpendicular direction to be operatively connected each other, and having one end forming a piston inserted into the other end of the container, wherein the tracer injection rod is hollow and comprises a number of release openings formed by boring on an outer circumferential surface of the tracer injection rod, so that the tracer supplied to a tracer injection pipe is released through the release openings; the tracer injection pipe with both of upper and lower ends being opened, the upper end fixed to the upper plate and the lower end operatively connected to the lower plate; and a sensor attached to the outer circumferential surface of the tracer injection rod lengthwise, to check a concentration of the tracer released around the tracer injection rod so as to be compared with an initial concentration of the tracer being injected.