the present invention provides a method for measuring hydrogen concentration in an electrically conductive material , such as a nuclear fuel rod , comprising calibrating an eddy current probe at a plurality of hydrogen concentrations ; measuring eddy currents at a plurality of positions along an electrically conductive material ; and calculating a hydrogen concentration in the electrically conductive material at each of the positions along the electrically conductive material . the present invention also provides a system for measuring hydrogen concentration in a nuclear fuel rod , comprising an eddy current probe ; a nuclear fuel rod calibration standard ; a data handling system for collecting data generated by the eddy current probe and for performing calculations using the data . the system may be utilized in - situ and may comprise a movable probe mount configured to hold the eddy current probe and to traverse the calibration standard and the nuclear fuel rod to be measured .