Abstract: A method is provided for automatically compensating liquid scintillation systems for efficiently counting samples of varying quench by establishing the amount of change of a system parameter such as gain required to restore the sample spectrum to be counted in at least one counting window to the proper counting window discriminator levels as a non-linear function of the change in a measure of quench. The degree of quench may be measured on each of the samples prior to counting, for instance by the external-standard channels-ratio method, and the system parameter automatically adjusted to restore the spectrum to the proper window or windows. Implementing circuitry shown includes a digital-to-analog converter and non-linear network which can be calibrated by using the endpoint of a known least quenched sample to establish the base gain and a reference standard and using a known, highly quenched sample to establish another point on the gain vs.