In the gamma ray measuring systems

the drifting problems of gamma ray spectra caused by the factors such as temperature variance

long measuring period and so on have been studied. Based on the steady energy and shape of a gamma photopeak

a method of searching peak and stabilizing spectrum is presented.Considering the photopeak as a criterion and the discriminating threshold as an adjustable object

the system is operated directly on the energy orientation of the energy windows measured

to ensure the stability of relative energy of the windows.