Characteristics study on the APD-based front-end readout for CsI(Tl) detector

Lang HU; Kaiqi ZHANG; Guoqiang ZENG; Maolin LAI; Jian YANG; Shilong WEI

doi:10.11889/j.0253-3219.2016.hjs.39.100401

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Characteristics study on the APD-based front-end readout for CsI(Tl) detector

更新时间：2021-05-24

- Characteristics study on the APD-based front-end readout for CsI(Tl) detector
- NUCLEAR TECHNIQUES Vol. 39, Issue 10, Article number: 100401(2016)
- 作者机构：
  
  成都理工大学地学核技术重点实验室成都 610059
- 作者简介：
- 基金信息：
  
  Key Laboratory of Applied Nuclear Techniques in Geosciences Sichuan;Youth Fund Projects of Sichuan Province
- DOI：10.11889/j.0253-3219.2016.hjs.39.100401
  CLC： TL8
- Received：29 June 2016，
  
  Revised：13 August 2016，
  
  Published：2016-10
- 稿件说明：
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Lang HU, Kaiqi ZHANG, Guoqiang ZENG, et al. Characteristics study on the APD-based front-end readout for CsI(Tl) detector[J]. Nuclear techniques, 2016, 39(10): 100401
DOI：

Lang HU, Kaiqi ZHANG, Guoqiang ZENG, et al. Characteristics study on the APD-based front-end readout for CsI(Tl) detector[J]. Nuclear techniques, 2016, 39(10): 100401 DOI： 10.11889/j.0253-3219.2016.hjs.39.100401.

摘要

雪崩光电二极管（Avalanche photodiode，APD）体积小、探测效率高、内置增益、对磁场不敏感，但其内置增益、输出脉冲信号的信噪比受偏置电压与温度影响明显。将APD作为CsI（Tl）闪烁晶体的光电读出器件，并配以低噪声的电荷灵敏前置放大器，组成闪烁探测器的探头。在不同的偏置电压与温度下，测试了该探头组成的闪烁探测器的能量分辨率。实测表明，偏置电压、温度将影响探测系统的能量分辨率，在室温且APD两端的偏置电压为370 V时，对能量为662 keV的γ射线能量分辨率为4.98%；在-20-40℃内，能量分辨率随温度的降低而提高。

Abstract

Background:

The avalanche photodiode (APD) has the advantages of small size

high detection efficiency

internal gain and insensitivity to magnet fields. But the internal gain and the signal-noise ratio (SNR) of the output signal of pulse are affected by bias voltage and temperature.

Purpose:

This study aims to test the effect of bias voltage and temperature on the APD-based front-end readout of scintillation detector.

Methods:

The avalanche photodiode is employed as the photodetector for CsI(Tl) scintillation

and equiped a charge sensitive preamplifier of low noise to form a probe. The energy resolution of scintillation detector with this probe was tested on a

137

Cs radiation source under different bias voltage and temperature.

Results:

The experimental results show that the energy resolution of the detection system is affected by both the bias voltage and the temperature. When the bias voltage at both ends of the APD is 370 V

the energy resolution is 4.98% for the gamma ray with the energy of 662 keV at the room temperature.

Conclusion:

The energy resolution will increase with the decrease of temperature within the range of -20℃ to 40℃.

关键词

Keywords

references

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