[en] Dead time correction method has been developed to compensate the counting loss which is produced in the measurement of radiation detector signals with a single channel analyzer. This method utilizes a simple combination of electronic circuits, which simulates dead time correction formula, to correct the counting loss in real time. The experiment showed that signals of 19 kcps was measured in error of about 1 %. Also, another dead time correction method utilizing a pulse generator has been developed for the counting loss in spectroscopy of radiation pulse signals by means of a multichannel pulse height analyzer. The electronic circuit for this dead time correction method can be composed of ordinary NIM modules. By this method, signals of 37 kcps was measured in error of about 1 %. (author)