An embodiment of a method for restoring detector resolution in an X-Ray fluorescence instrument is described that comprises: measuring a resolution value of a detector in the X-Ray fluorescence instrument using a standard material at a first temperature; determining that the measured resolution value deviates from a target value; and adjusting the temperature of the detector to a second temperature that restores the resolution value of the detector to the target value, wherein the temperature is adjusted by an amount defined by a relationship of temperature change to the degree of deviation of detector resolution from the target value.