This study systematically investigated the changes in peak position and energy resolution of the NaI(Tl)detector's spectrum response to 60Co under temperature variations from 20 ℃ to-40 ℃,as well as the changes in performance parameters of the detector's output pulse signals.The spectrum exhibits a rightward drift as the temperature decreases from 20 ℃ to 0 ℃,followed by a leftward drift as it continues to decrease below 0 ℃.In the temperature range of 20 ℃ to-20 ℃,the peak shift of the 1.33 MeV peak in the 60Co spectrum was relatively small,not exceeding 3.2％.However,below-20 ℃,the peak noticeably shifts to the left,reaching a maximum shift of 24.86％at-40 ℃.Simultaneously,the energy resolution of the 1.33 MeV peak in the 60Co spectrum deteriorates as the temperature decreases from 20 ℃ to-40 ℃,increasing from 5.20％to 8.67％.Furthermore,the pulse width of the output pulses gradually increases with the decrease in temperature,and the counting rate upper limit of the detector gradually decreases with the temperature decrease.Finally,through the application of a relative peak position correction method,successful correction of temperature drift at low temperatures was achieved,ensuring consistency in the characteristic peak positions of γ-rays at different temperature levels.These research findings are of significant importance for enhancing the performance and applications of NaI(Tl)detectors in low-temperature environments.
维普
万方数据