.~.~ With placement of tracer in or about well {1}
260
.~.~.~ Tracer being or including radioactive material
DEFINITION
Classification: 250/260
(under subclass 259) Subject matter wherein the added material is radioactive or contains radioactive material entrained in a substance added to the well.
SEE OR SEARCH THIS CLASS, SUBCLASS:
259, for tracers which must be irradiated in the well before they become radioactive.
303, for methods detecting radioactive tracers generally.
493.1+, for radioactive sources which are more than a composition, recited as a source.
SEE OR SEARCH CLASS
252, Compositions,
301.1, for radioactive compositions.
424, Drug, Bio-Affecting and Body Treating Compositions,
1, for a radioactive composition for medical use.
600, Surgery,
1+, for radioactive substances applied to the body for therapeutic purposes and holders therefore.
