Gamma spectrum stabilization method based on nonlinear least squares optimization

Ye Chen; Jinglun Li; Yuzhong Zhang; Wuyun Xiao

doi:10.1016/j.apradiso.2020.109515

Gamma spectrum stabilization method based on nonlinear least squares optimization

Appl Radiat Isot. 2021 Mar:169:109515. doi: 10.1016/j.apradiso.2020.109515. Epub 2020 Dec 13.

Authors

Ye Chen¹, Jinglun Li¹, Yuzhong Zhang¹, Wuyun Xiao²

Affiliations

¹ State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China.
² State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China. Electronic address: xiaowuyun@sklnbcpc.cn.

PMID: 33340789
DOI: 10.1016/j.apradiso.2020.109515

Abstract

To suppress spectral drift in lengthy gamma spectrum measurements, a convenient and practical spectrum stabilization method with software-only adjustment is studied. The gamma energy spectra are recorded in consecutive small time intervals. The drifts in different time intervals relative to the first reference spectrum are estimated with a full spectrum nonlinear optimization technique, and the drifted spectra are corrected and accumulated to form a drift-free spectrum. This method needs neither hardware adjustment such as high voltage or electronics gain, nor peak location. Presented experimental results show that the stabilization accuracy can be significantly improved using this approach.

Keywords: Nonlinear least squares optimization; Scintillation spectrometer; Spectrum drift; Spectrum reallocation; Spectrum stabilization.