Reducing NaI(Tl) Detector Spectrum Shift by Optimizing Pulse Integration Time

Quan, Wei; Zhang, Zhaohui; Dai, Tiantian; Liu, Xin; Li, Gang; Xu, Tingfa; Jiang, Nianming; Liu, Yaqiang

doi:10.1109/tns.2020.2964497

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…The following formula [22] was used in the pulse analysis to generate the average pulse waveform (APW) for all recorded events and the baseline value (𝑏) was calculated dynamically using the average value of the first 50 points:…”

Section: Data Processing and Analysismentioning

confidence: 99%

Study of waveform characteristics of scintillator detector excited by ultraviolet light-emitting diodes

Yang¹,

Zhou²,

Yang³

et al. 2021

J. Inst.

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Radioactive sources excite scintillators, causing them to emit fluorescence, and are thus widely used in studies of the performance of scintillators. Ultraviolet (UV) light-emitting diodes (LEDs) can also excite scintillators to produce fluorescence. In this paper, the waveform characteristics of a UV LED-excited scintillator detector are studied and compared with the characteristics obtained when using a radioactive source. Test results show that the trailing edge of the scintillation pulse excited by the UV LED has exponential decay characteristics that are similar to those obtained under 137Cs excitation. The light intensity of the UV LED shows a good linear relationship with the peak position of the pulse. Furthermore, a macroscopic model for the output waveform from the scintillator when excited by a UV LED is established and the model is modified based on the experimental results. Although the scintillator's response to the UV source cannot simulate its response to gamma-ray sources fully, we hope that this method can be used in preliminary testing of scintillation detectors or when the use of radiation sources is limited.

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Section: Data Processing and Analysismentioning

confidence: 99%

Study of waveform characteristics of scintillator detector excited by ultraviolet light-emitting diodes

Yang¹,

Zhou²,

Yang³

et al. 2021

J. Inst.

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show abstract

“…Modifications to subsequent circuits allow for the elimination of temperature-induced differences between radiation pulses through pulse deconvolution, trapezoidal shaping, and amplitude correction [ 8 ]. Additionally, adjusting the integration time to 385 ns instead of 1.23 µs mitigates temperature-dependent energy calculation, reducing spectral shift [ 9 ]. Nevertheless, these methods can introduce complexity to the electronics system and only address temperature drift in scintillation and PMT, neglecting other factors influencing PMT gain and temperature effects on subsequent circuits.…”

Section: Introductionmentioning

confidence: 99%

Temperature Peak-Drift Correction Method for NaI(Tl) Detectors Using the Background Peak

Wen,

Zhou

2024

Sensors

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The overall gain of a scintillation detector is temperature-dependent, leading to a drift in the measured gamma energy spectrum with changes in temperature. To mitigate this effect, a temperature drift correction is essential prior to conducting gamma spectrum analysis. In this study, the detector gain ratio is determined by comparing the positions of the same background peak across different spectra. Subsequently, the original spectrum is adjusted accordingly to obtain a gamma spectrum free from temperature drift. Experimental results demonstrate that after implementing this correction, the relative deviation of the 57Co characteristic peak positions in the gamma spectrum measured by the NaI(Tl) detector is reduced from 18.64% to 0.91%. Furthermore, by performing energy calibration beforehand, the characteristic peak position can be utilized for secondary correction, further minimizing temperature drift. Our findings indicate that the relative deviation of the 22Na characteristic peak positions was reduced, respectively, to 0.51% and 0.46% through secondary correction. This approach, which utilizes the background peak for correction, avoids the need for additional radioactivity or circuitry and effectively mitigates peak drift. Overall, this method holds significant implications for enhancing the accuracy of gamma spectrum analysis.

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Artifact analysis of a far-field coded-aperture gamma camera extended to partially coded field-of-view

Liu²,

Zhang³

et al. 2022

Radiat Detect Technol Methods

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Reducing NaI(Tl) Detector Spectrum Shift by Optimizing Pulse Integration Time

Cited by 4 publications

References 16 publications

Study of waveform characteristics of scintillator detector excited by ultraviolet light-emitting diodes

Study of waveform characteristics of scintillator detector excited by ultraviolet light-emitting diodes

Temperature Peak-Drift Correction Method for NaI(Tl) Detectors Using the Background Peak

Artifact analysis of a far-field coded-aperture gamma camera extended to partially coded field-of-view

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