Research on Spectrum Stabilization Technology Based on Light-emitting Diode

Aiming at the problem that NaI(Tl) scintillation gamma spectrometer is susceptible to the influence of ambient temperature, resulting in energy spectrum drift and poor stability, which leads to the difficulty in energy spectrum analysis, the LED based rapid spectral stabilization method is preliminarily discussed, and the LED spectrum stabilization system is independently built. It can be noted that the led-based spectral stabilization method has the advantages of safety, reliability, clean, and can broaden the application of NaI(Tl) scintillation gamma spectrometer. By driving the LED with constant current pulse, stable LED light pulse is obtained. The temperature experiment of the system was carried out and the variation curves of several common radioactive sources and LED energy peaks in the temperature range of -25 ℃~+55 ℃ are obtained. The temperature changes cause the peak position of the radioactive source to drift. The drift amount exceeds 10% at some temperatures. After the spectrum is stabilized, the peak position drift is reduced to within ±5%. The effective spectral stabilization of the γ-ray spectrometer is realized when the temperature changes over a wide range.