(under subclass 256) Subject matter which includes means to cause two fluids to meet in a well to force one of the fluids into the earth, said one fluid being material or including material which emanates radiation, modified radiation, or causes radiation by interacting with radiation from the means to expose the material to radiation, wherein the means to detect radiation senses the said one fluid at the meeting point of the fluids, and methods corresponding to the apparatus.
(1) Note. Generally, the depth at which the meeting point of the fluids occurs is recorded along with the results of the sensing.
SEE OR SEARCH THIS CLASS, SUBCLASS:
259+, for fluids added to a well which may be or contain tracer material which is fluorescent or radioactive or capable of being made radioactive by irradiation.
