Abstract: A corrosion monitoring probe consisting of a housing for mounting a piece of radioactive material in a surface of a body the corrosion of which is to be measured so that the radioactive material is exposed to the same corrosive environment as the surface of the body, and means for measuring the intensity of ionizing radiation emitted by the radioactive material. The housing also contains a reference source of ionizing radiation and means for exposing a radiation detector which forms part of the means for measuring the intensity of ionizing radiation emitted by the radioactive material alternately to the radioactive material and the reference source of ionizing radiation.

Abstract: A method of and apparatus for the detection of pitting corrosion, in which simultaneous measurements of the rate of loss of material from a body under test are made by means of changes in the resistance of the body and thin layer activation analysis. If the body is corroding uniformly, the rate of loss of material as measured by each technique is the same; if pitting corrosion is occuring, then the two measured rates of loss of material are different.